1 use crate::abi::{Abi, FnAbi, LlvmType, PassMode};
2 use crate::builder::Builder;
3 use crate::context::CodegenCx;
5 use crate::type_::Type;
6 use crate::type_of::LayoutLlvmExt;
7 use crate::va_arg::emit_va_arg;
8 use crate::value::Value;
10 use rustc_codegen_ssa::base::{compare_simd_types, wants_msvc_seh};
11 use rustc_codegen_ssa::common::span_invalid_monomorphization_error;
12 use rustc_codegen_ssa::common::{IntPredicate, TypeKind};
13 use rustc_codegen_ssa::mir::operand::OperandRef;
14 use rustc_codegen_ssa::mir::place::PlaceRef;
15 use rustc_codegen_ssa::traits::*;
17 use rustc_middle::ty::layout::{FnAbiExt, HasTyCtxt};
18 use rustc_middle::ty::{self, Ty};
19 use rustc_middle::{bug, span_bug};
20 use rustc_span::{sym, symbol::kw, Span, Symbol};
21 use rustc_target::abi::{self, HasDataLayout, LayoutOf, Primitive};
22 use rustc_target::spec::PanicStrategy;
24 use std::cmp::Ordering;
27 fn get_simple_intrinsic(cx: &CodegenCx<'ll, '_>, name: Symbol) -> Option<&'ll Value> {
28 let llvm_name = match name {
29 sym::sqrtf32 => "llvm.sqrt.f32",
30 sym::sqrtf64 => "llvm.sqrt.f64",
31 sym::powif32 => "llvm.powi.f32",
32 sym::powif64 => "llvm.powi.f64",
33 sym::sinf32 => "llvm.sin.f32",
34 sym::sinf64 => "llvm.sin.f64",
35 sym::cosf32 => "llvm.cos.f32",
36 sym::cosf64 => "llvm.cos.f64",
37 sym::powf32 => "llvm.pow.f32",
38 sym::powf64 => "llvm.pow.f64",
39 sym::expf32 => "llvm.exp.f32",
40 sym::expf64 => "llvm.exp.f64",
41 sym::exp2f32 => "llvm.exp2.f32",
42 sym::exp2f64 => "llvm.exp2.f64",
43 sym::logf32 => "llvm.log.f32",
44 sym::logf64 => "llvm.log.f64",
45 sym::log10f32 => "llvm.log10.f32",
46 sym::log10f64 => "llvm.log10.f64",
47 sym::log2f32 => "llvm.log2.f32",
48 sym::log2f64 => "llvm.log2.f64",
49 sym::fmaf32 => "llvm.fma.f32",
50 sym::fmaf64 => "llvm.fma.f64",
51 sym::fabsf32 => "llvm.fabs.f32",
52 sym::fabsf64 => "llvm.fabs.f64",
53 sym::minnumf32 => "llvm.minnum.f32",
54 sym::minnumf64 => "llvm.minnum.f64",
55 sym::maxnumf32 => "llvm.maxnum.f32",
56 sym::maxnumf64 => "llvm.maxnum.f64",
57 sym::copysignf32 => "llvm.copysign.f32",
58 sym::copysignf64 => "llvm.copysign.f64",
59 sym::floorf32 => "llvm.floor.f32",
60 sym::floorf64 => "llvm.floor.f64",
61 sym::ceilf32 => "llvm.ceil.f32",
62 sym::ceilf64 => "llvm.ceil.f64",
63 sym::truncf32 => "llvm.trunc.f32",
64 sym::truncf64 => "llvm.trunc.f64",
65 sym::rintf32 => "llvm.rint.f32",
66 sym::rintf64 => "llvm.rint.f64",
67 sym::nearbyintf32 => "llvm.nearbyint.f32",
68 sym::nearbyintf64 => "llvm.nearbyint.f64",
69 sym::roundf32 => "llvm.round.f32",
70 sym::roundf64 => "llvm.round.f64",
73 Some(cx.get_intrinsic(&llvm_name))
76 impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
77 fn codegen_intrinsic_call(
79 instance: ty::Instance<'tcx>,
80 fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
81 args: &[OperandRef<'tcx, &'ll Value>],
86 let callee_ty = instance.ty(tcx, ty::ParamEnv::reveal_all());
88 let (def_id, substs) = match *callee_ty.kind() {
89 ty::FnDef(def_id, substs) => (def_id, substs),
90 _ => bug!("expected fn item type, found {}", callee_ty),
93 let sig = callee_ty.fn_sig(tcx);
94 let sig = tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), sig);
95 let arg_tys = sig.inputs();
96 let ret_ty = sig.output();
97 let name = tcx.item_name(def_id);
98 let name_str = &*name.as_str();
100 let llret_ty = self.layout_of(ret_ty).llvm_type(self);
101 let result = PlaceRef::new_sized(llresult, fn_abi.ret.layout);
103 let simple = get_simple_intrinsic(self, name);
104 let llval = match name {
105 _ if simple.is_some() => self.call(
107 &args.iter().map(|arg| arg.immediate()).collect::<Vec<_>>(),
111 let expect = self.get_intrinsic(&("llvm.expect.i1"));
112 self.call(expect, &[args[0].immediate(), self.const_bool(true)], None)
115 let expect = self.get_intrinsic(&("llvm.expect.i1"));
116 self.call(expect, &[args[0].immediate(), self.const_bool(false)], None)
129 let llfn = self.get_intrinsic(&("llvm.debugtrap"));
130 self.call(llfn, &[], None)
133 let intrinsic = self.cx().get_intrinsic(&("llvm.va_copy"));
134 self.call(intrinsic, &[args[0].immediate(), args[1].immediate()], None)
137 match fn_abi.ret.layout.abi {
138 abi::Abi::Scalar(ref scalar) => {
140 Primitive::Int(..) => {
141 if self.cx().size_of(ret_ty).bytes() < 4 {
142 // `va_arg` should not be called on a integer type
143 // less than 4 bytes in length. If it is, promote
144 // the integer to a `i32` and truncate the result
145 // back to the smaller type.
146 let promoted_result = emit_va_arg(self, args[0], tcx.types.i32);
147 self.trunc(promoted_result, llret_ty)
149 emit_va_arg(self, args[0], ret_ty)
152 Primitive::F64 | Primitive::Pointer => {
153 emit_va_arg(self, args[0], ret_ty)
155 // `va_arg` should never be used with the return type f32.
156 Primitive::F32 => bug!("the va_arg intrinsic does not work with `f32`"),
159 _ => bug!("the va_arg intrinsic does not work with non-scalar types"),
163 sym::volatile_load | sym::unaligned_volatile_load => {
164 let tp_ty = substs.type_at(0);
165 let ptr = args[0].immediate();
166 let load = if let PassMode::Cast(ty) = fn_abi.ret.mode {
167 let llty = ty.llvm_type(self);
168 let ptr = self.pointercast(ptr, self.type_ptr_to(llty));
169 self.volatile_load(llty, ptr)
171 self.volatile_load(self.layout_of(tp_ty).llvm_type(self), ptr)
173 let align = if name == sym::unaligned_volatile_load {
176 self.align_of(tp_ty).bytes() as u32
179 llvm::LLVMSetAlignment(load, align);
181 self.to_immediate(load, self.layout_of(tp_ty))
183 sym::volatile_store => {
184 let dst = args[0].deref(self.cx());
185 args[1].val.volatile_store(self, dst);
188 sym::unaligned_volatile_store => {
189 let dst = args[0].deref(self.cx());
190 args[1].val.unaligned_volatile_store(self, dst);
193 sym::prefetch_read_data
194 | sym::prefetch_write_data
195 | sym::prefetch_read_instruction
196 | sym::prefetch_write_instruction => {
197 let expect = self.get_intrinsic(&("llvm.prefetch"));
198 let (rw, cache_type) = match name {
199 sym::prefetch_read_data => (0, 1),
200 sym::prefetch_write_data => (1, 1),
201 sym::prefetch_read_instruction => (0, 0),
202 sym::prefetch_write_instruction => (1, 0),
211 self.const_i32(cache_type),
225 | sym::saturating_add
226 | sym::saturating_sub => {
228 match int_type_width_signed(ty, self) {
229 Some((width, signed)) => match name {
230 sym::ctlz | sym::cttz => {
231 let y = self.const_bool(false);
232 let llfn = self.get_intrinsic(&format!("llvm.{}.i{}", name, width));
233 self.call(llfn, &[args[0].immediate(), y], None)
235 sym::ctlz_nonzero | sym::cttz_nonzero => {
236 let y = self.const_bool(true);
237 let llvm_name = &format!("llvm.{}.i{}", &name_str[..4], width);
238 let llfn = self.get_intrinsic(llvm_name);
239 self.call(llfn, &[args[0].immediate(), y], None)
241 sym::ctpop => self.call(
242 self.get_intrinsic(&format!("llvm.ctpop.i{}", width)),
243 &[args[0].immediate()],
248 args[0].immediate() // byte swap a u8/i8 is just a no-op
251 self.get_intrinsic(&format!("llvm.bswap.i{}", width)),
252 &[args[0].immediate()],
257 sym::bitreverse => self.call(
258 self.get_intrinsic(&format!("llvm.bitreverse.i{}", width)),
259 &[args[0].immediate()],
262 sym::rotate_left | sym::rotate_right => {
263 let is_left = name == sym::rotate_left;
264 let val = args[0].immediate();
265 let raw_shift = args[1].immediate();
266 // rotate = funnel shift with first two args the same
268 &format!("llvm.fsh{}.i{}", if is_left { 'l' } else { 'r' }, width);
269 let llfn = self.get_intrinsic(llvm_name);
270 self.call(llfn, &[val, val, raw_shift], None)
272 sym::saturating_add | sym::saturating_sub => {
273 let is_add = name == sym::saturating_add;
274 let lhs = args[0].immediate();
275 let rhs = args[1].immediate();
276 let llvm_name = &format!(
278 if signed { 's' } else { 'u' },
279 if is_add { "add" } else { "sub" },
282 let llfn = self.get_intrinsic(llvm_name);
283 self.call(llfn, &[lhs, rhs], None)
288 span_invalid_monomorphization_error(
292 "invalid monomorphization of `{}` intrinsic: \
293 expected basic integer type, found `{}`",
304 let tp_ty = substs.type_at(0);
305 let layout = self.layout_of(tp_ty).layout;
306 let use_integer_compare = match layout.abi {
307 Scalar(_) | ScalarPair(_, _) => true,
308 Uninhabited | Vector { .. } => false,
309 Aggregate { .. } => {
310 // For rusty ABIs, small aggregates are actually passed
311 // as `RegKind::Integer` (see `FnAbi::adjust_for_abi`),
312 // so we re-use that same threshold here.
313 layout.size <= self.data_layout().pointer_size * 2
317 let a = args[0].immediate();
318 let b = args[1].immediate();
319 if layout.size.bytes() == 0 {
320 self.const_bool(true)
321 } else if use_integer_compare {
322 let integer_ty = self.type_ix(layout.size.bits());
323 let ptr_ty = self.type_ptr_to(integer_ty);
324 let a_ptr = self.bitcast(a, ptr_ty);
325 let a_val = self.load(integer_ty, a_ptr, layout.align.abi);
326 let b_ptr = self.bitcast(b, ptr_ty);
327 let b_val = self.load(integer_ty, b_ptr, layout.align.abi);
328 self.icmp(IntPredicate::IntEQ, a_val, b_val)
330 let i8p_ty = self.type_i8p();
331 let a_ptr = self.bitcast(a, i8p_ty);
332 let b_ptr = self.bitcast(b, i8p_ty);
333 let n = self.const_usize(layout.size.bytes());
334 let llfn = self.get_intrinsic("memcmp");
335 let cmp = self.call(llfn, &[a_ptr, b_ptr, n], None);
336 self.icmp(IntPredicate::IntEQ, cmp, self.const_i32(0))
340 _ if name_str.starts_with("simd_") => {
341 match generic_simd_intrinsic(self, name, callee_ty, args, ret_ty, llret_ty, span) {
347 _ => bug!("unknown intrinsic '{}'", name),
350 if !fn_abi.ret.is_ignore() {
351 if let PassMode::Cast(ty) = fn_abi.ret.mode {
352 let ptr_llty = self.type_ptr_to(ty.llvm_type(self));
353 let ptr = self.pointercast(result.llval, ptr_llty);
354 self.store(llval, ptr, result.align);
356 OperandRef::from_immediate_or_packed_pair(self, llval, result.layout)
358 .store(self, result);
363 fn abort(&mut self) {
364 let fnname = self.get_intrinsic(&("llvm.trap"));
365 self.call(fnname, &[], None);
368 fn assume(&mut self, val: Self::Value) {
369 let assume_intrinsic = self.get_intrinsic("llvm.assume");
370 self.call(assume_intrinsic, &[val], None);
373 fn expect(&mut self, cond: Self::Value, expected: bool) -> Self::Value {
374 let expect = self.get_intrinsic(&"llvm.expect.i1");
375 self.call(expect, &[cond, self.const_bool(expected)], None)
378 fn sideeffect(&mut self) {
379 // This kind of check would make a ton of sense in the caller, but currently the only
380 // caller of this function is in `rustc_codegen_ssa`, which is agnostic to whether LLVM
381 // codegen backend being used, and so is unable to check the LLVM version.
382 if unsafe { llvm::LLVMRustVersionMajor() } < 12 {
383 let fnname = self.get_intrinsic(&("llvm.sideeffect"));
384 self.call(fnname, &[], None);
388 fn va_start(&mut self, va_list: &'ll Value) -> &'ll Value {
389 let intrinsic = self.cx().get_intrinsic("llvm.va_start");
390 self.call(intrinsic, &[va_list], None)
393 fn va_end(&mut self, va_list: &'ll Value) -> &'ll Value {
394 let intrinsic = self.cx().get_intrinsic("llvm.va_end");
395 self.call(intrinsic, &[va_list], None)
400 bx: &mut Builder<'a, 'll, 'tcx>,
401 try_func: &'ll Value,
403 catch_func: &'ll Value,
406 if bx.sess().panic_strategy() == PanicStrategy::Abort {
407 bx.call(try_func, &[data], None);
408 // Return 0 unconditionally from the intrinsic call;
409 // we can never unwind.
410 let ret_align = bx.tcx().data_layout.i32_align.abi;
411 bx.store(bx.const_i32(0), dest, ret_align);
412 } else if wants_msvc_seh(bx.sess()) {
413 codegen_msvc_try(bx, try_func, data, catch_func, dest);
414 } else if bx.sess().target.is_like_emscripten {
415 codegen_emcc_try(bx, try_func, data, catch_func, dest);
417 codegen_gnu_try(bx, try_func, data, catch_func, dest);
421 // MSVC's definition of the `rust_try` function.
423 // This implementation uses the new exception handling instructions in LLVM
424 // which have support in LLVM for SEH on MSVC targets. Although these
425 // instructions are meant to work for all targets, as of the time of this
426 // writing, however, LLVM does not recommend the usage of these new instructions
427 // as the old ones are still more optimized.
429 bx: &mut Builder<'a, 'll, 'tcx>,
430 try_func: &'ll Value,
432 catch_func: &'ll Value,
435 let llfn = get_rust_try_fn(bx, &mut |mut bx| {
436 bx.set_personality_fn(bx.eh_personality());
438 let mut normal = bx.build_sibling_block("normal");
439 let mut catchswitch = bx.build_sibling_block("catchswitch");
440 let mut catchpad_rust = bx.build_sibling_block("catchpad_rust");
441 let mut catchpad_foreign = bx.build_sibling_block("catchpad_foreign");
442 let mut caught = bx.build_sibling_block("caught");
444 let try_func = llvm::get_param(bx.llfn(), 0);
445 let data = llvm::get_param(bx.llfn(), 1);
446 let catch_func = llvm::get_param(bx.llfn(), 2);
448 // We're generating an IR snippet that looks like:
450 // declare i32 @rust_try(%try_func, %data, %catch_func) {
451 // %slot = alloca i8*
452 // invoke %try_func(%data) to label %normal unwind label %catchswitch
458 // %cs = catchswitch within none [%catchpad_rust, %catchpad_foreign] unwind to caller
461 // %tok = catchpad within %cs [%type_descriptor, 8, %slot]
463 // call %catch_func(%data, %ptr)
464 // catchret from %tok to label %caught
467 // %tok = catchpad within %cs [null, 64, null]
468 // call %catch_func(%data, null)
469 // catchret from %tok to label %caught
475 // This structure follows the basic usage of throw/try/catch in LLVM.
476 // For example, compile this C++ snippet to see what LLVM generates:
478 // struct rust_panic {
479 // rust_panic(const rust_panic&);
486 // void (*try_func)(void*),
488 // void (*catch_func)(void*, void*) noexcept
493 // } catch(rust_panic& a) {
494 // catch_func(data, &a);
497 // catch_func(data, NULL);
502 // More information can be found in libstd's seh.rs implementation.
503 let ptr_align = bx.tcx().data_layout.pointer_align.abi;
504 let slot = bx.alloca(bx.type_i8p(), ptr_align);
505 bx.invoke(try_func, &[data], normal.llbb(), catchswitch.llbb(), None);
507 normal.ret(bx.const_i32(0));
509 let cs = catchswitch.catch_switch(None, None, 2);
510 catchswitch.add_handler(cs, catchpad_rust.llbb());
511 catchswitch.add_handler(cs, catchpad_foreign.llbb());
513 // We can't use the TypeDescriptor defined in libpanic_unwind because it
514 // might be in another DLL and the SEH encoding only supports specifying
515 // a TypeDescriptor from the current module.
517 // However this isn't an issue since the MSVC runtime uses string
518 // comparison on the type name to match TypeDescriptors rather than
521 // So instead we generate a new TypeDescriptor in each module that uses
522 // `try` and let the linker merge duplicate definitions in the same
525 // When modifying, make sure that the type_name string exactly matches
526 // the one used in src/libpanic_unwind/seh.rs.
527 let type_info_vtable = bx.declare_global("??_7type_info@@6B@", bx.type_i8p());
528 let type_name = bx.const_bytes(b"rust_panic\0");
530 bx.const_struct(&[type_info_vtable, bx.const_null(bx.type_i8p()), type_name], false);
531 let tydesc = bx.declare_global("__rust_panic_type_info", bx.val_ty(type_info));
533 llvm::LLVMRustSetLinkage(tydesc, llvm::Linkage::LinkOnceODRLinkage);
534 llvm::SetUniqueComdat(bx.llmod, tydesc);
535 llvm::LLVMSetInitializer(tydesc, type_info);
538 // The flag value of 8 indicates that we are catching the exception by
539 // reference instead of by value. We can't use catch by value because
540 // that requires copying the exception object, which we don't support
541 // since our exception object effectively contains a Box.
543 // Source: MicrosoftCXXABI::getAddrOfCXXCatchHandlerType in clang
544 let flags = bx.const_i32(8);
545 let funclet = catchpad_rust.catch_pad(cs, &[tydesc, flags, slot]);
546 let ptr = catchpad_rust.load(bx.type_i8p(), slot, ptr_align);
547 catchpad_rust.call(catch_func, &[data, ptr], Some(&funclet));
548 catchpad_rust.catch_ret(&funclet, caught.llbb());
550 // The flag value of 64 indicates a "catch-all".
551 let flags = bx.const_i32(64);
552 let null = bx.const_null(bx.type_i8p());
553 let funclet = catchpad_foreign.catch_pad(cs, &[null, flags, null]);
554 catchpad_foreign.call(catch_func, &[data, null], Some(&funclet));
555 catchpad_foreign.catch_ret(&funclet, caught.llbb());
557 caught.ret(bx.const_i32(1));
560 // Note that no invoke is used here because by definition this function
561 // can't panic (that's what it's catching).
562 let ret = bx.call(llfn, &[try_func, data, catch_func], None);
563 let i32_align = bx.tcx().data_layout.i32_align.abi;
564 bx.store(ret, dest, i32_align);
567 // Definition of the standard `try` function for Rust using the GNU-like model
568 // of exceptions (e.g., the normal semantics of LLVM's `landingpad` and `invoke`
571 // This codegen is a little surprising because we always call a shim
572 // function instead of inlining the call to `invoke` manually here. This is done
573 // because in LLVM we're only allowed to have one personality per function
574 // definition. The call to the `try` intrinsic is being inlined into the
575 // function calling it, and that function may already have other personality
576 // functions in play. By calling a shim we're guaranteed that our shim will have
577 // the right personality function.
579 bx: &mut Builder<'a, 'll, 'tcx>,
580 try_func: &'ll Value,
582 catch_func: &'ll Value,
585 let llfn = get_rust_try_fn(bx, &mut |mut bx| {
586 // Codegens the shims described above:
589 // invoke %try_func(%data) normal %normal unwind %catch
595 // (%ptr, _) = landingpad
596 // call %catch_func(%data, %ptr)
598 let mut then = bx.build_sibling_block("then");
599 let mut catch = bx.build_sibling_block("catch");
601 let try_func = llvm::get_param(bx.llfn(), 0);
602 let data = llvm::get_param(bx.llfn(), 1);
603 let catch_func = llvm::get_param(bx.llfn(), 2);
604 bx.invoke(try_func, &[data], then.llbb(), catch.llbb(), None);
605 then.ret(bx.const_i32(0));
607 // Type indicator for the exception being thrown.
609 // The first value in this tuple is a pointer to the exception object
610 // being thrown. The second value is a "selector" indicating which of
611 // the landing pad clauses the exception's type had been matched to.
612 // rust_try ignores the selector.
613 let lpad_ty = bx.type_struct(&[bx.type_i8p(), bx.type_i32()], false);
614 let vals = catch.landing_pad(lpad_ty, bx.eh_personality(), 1);
615 let tydesc = bx.const_null(bx.type_i8p());
616 catch.add_clause(vals, tydesc);
617 let ptr = catch.extract_value(vals, 0);
618 catch.call(catch_func, &[data, ptr], None);
619 catch.ret(bx.const_i32(1));
622 // Note that no invoke is used here because by definition this function
623 // can't panic (that's what it's catching).
624 let ret = bx.call(llfn, &[try_func, data, catch_func], None);
625 let i32_align = bx.tcx().data_layout.i32_align.abi;
626 bx.store(ret, dest, i32_align);
629 // Variant of codegen_gnu_try used for emscripten where Rust panics are
630 // implemented using C++ exceptions. Here we use exceptions of a specific type
631 // (`struct rust_panic`) to represent Rust panics.
633 bx: &mut Builder<'a, 'll, 'tcx>,
634 try_func: &'ll Value,
636 catch_func: &'ll Value,
639 let llfn = get_rust_try_fn(bx, &mut |mut bx| {
640 // Codegens the shims described above:
643 // invoke %try_func(%data) normal %normal unwind %catch
649 // (%ptr, %selector) = landingpad
650 // %rust_typeid = @llvm.eh.typeid.for(@_ZTI10rust_panic)
651 // %is_rust_panic = %selector == %rust_typeid
652 // %catch_data = alloca { i8*, i8 }
653 // %catch_data[0] = %ptr
654 // %catch_data[1] = %is_rust_panic
655 // call %catch_func(%data, %catch_data)
657 let mut then = bx.build_sibling_block("then");
658 let mut catch = bx.build_sibling_block("catch");
660 let try_func = llvm::get_param(bx.llfn(), 0);
661 let data = llvm::get_param(bx.llfn(), 1);
662 let catch_func = llvm::get_param(bx.llfn(), 2);
663 bx.invoke(try_func, &[data], then.llbb(), catch.llbb(), None);
664 then.ret(bx.const_i32(0));
666 // Type indicator for the exception being thrown.
668 // The first value in this tuple is a pointer to the exception object
669 // being thrown. The second value is a "selector" indicating which of
670 // the landing pad clauses the exception's type had been matched to.
671 let tydesc = bx.eh_catch_typeinfo();
672 let lpad_ty = bx.type_struct(&[bx.type_i8p(), bx.type_i32()], false);
673 let vals = catch.landing_pad(lpad_ty, bx.eh_personality(), 2);
674 catch.add_clause(vals, tydesc);
675 catch.add_clause(vals, bx.const_null(bx.type_i8p()));
676 let ptr = catch.extract_value(vals, 0);
677 let selector = catch.extract_value(vals, 1);
679 // Check if the typeid we got is the one for a Rust panic.
680 let llvm_eh_typeid_for = bx.get_intrinsic("llvm.eh.typeid.for");
681 let rust_typeid = catch.call(llvm_eh_typeid_for, &[tydesc], None);
682 let is_rust_panic = catch.icmp(IntPredicate::IntEQ, selector, rust_typeid);
683 let is_rust_panic = catch.zext(is_rust_panic, bx.type_bool());
685 // We need to pass two values to catch_func (ptr and is_rust_panic), so
686 // create an alloca and pass a pointer to that.
687 let ptr_align = bx.tcx().data_layout.pointer_align.abi;
688 let i8_align = bx.tcx().data_layout.i8_align.abi;
689 let catch_data_type = bx.type_struct(&[bx.type_i8p(), bx.type_bool()], false);
690 let catch_data = catch.alloca(catch_data_type, ptr_align);
691 let catch_data_0 = catch.inbounds_gep(
694 &[bx.const_usize(0), bx.const_usize(0)],
696 catch.store(ptr, catch_data_0, ptr_align);
697 let catch_data_1 = catch.inbounds_gep(
700 &[bx.const_usize(0), bx.const_usize(1)],
702 catch.store(is_rust_panic, catch_data_1, i8_align);
703 let catch_data = catch.bitcast(catch_data, bx.type_i8p());
705 catch.call(catch_func, &[data, catch_data], None);
706 catch.ret(bx.const_i32(1));
709 // Note that no invoke is used here because by definition this function
710 // can't panic (that's what it's catching).
711 let ret = bx.call(llfn, &[try_func, data, catch_func], None);
712 let i32_align = bx.tcx().data_layout.i32_align.abi;
713 bx.store(ret, dest, i32_align);
716 // Helper function to give a Block to a closure to codegen a shim function.
717 // This is currently primarily used for the `try` intrinsic functions above.
718 fn gen_fn<'ll, 'tcx>(
719 cx: &CodegenCx<'ll, 'tcx>,
721 rust_fn_sig: ty::PolyFnSig<'tcx>,
722 codegen: &mut dyn FnMut(Builder<'_, 'll, 'tcx>),
724 let fn_abi = FnAbi::of_fn_ptr(cx, rust_fn_sig, &[]);
725 let llfn = cx.declare_fn(name, &fn_abi);
726 cx.set_frame_pointer_type(llfn);
727 cx.apply_target_cpu_attr(llfn);
728 // FIXME(eddyb) find a nicer way to do this.
729 unsafe { llvm::LLVMRustSetLinkage(llfn, llvm::Linkage::InternalLinkage) };
730 let llbb = Builder::append_block(cx, llfn, "entry-block");
731 let bx = Builder::build(cx, llbb);
736 // Helper function used to get a handle to the `__rust_try` function used to
739 // This function is only generated once and is then cached.
740 fn get_rust_try_fn<'ll, 'tcx>(
741 cx: &CodegenCx<'ll, 'tcx>,
742 codegen: &mut dyn FnMut(Builder<'_, 'll, 'tcx>),
744 if let Some(llfn) = cx.rust_try_fn.get() {
748 // Define the type up front for the signature of the rust_try function.
750 let i8p = tcx.mk_mut_ptr(tcx.types.i8);
751 // `unsafe fn(*mut i8) -> ()`
752 let try_fn_ty = tcx.mk_fn_ptr(ty::Binder::dummy(tcx.mk_fn_sig(
756 hir::Unsafety::Unsafe,
759 // `unsafe fn(*mut i8, *mut i8) -> ()`
760 let catch_fn_ty = tcx.mk_fn_ptr(ty::Binder::dummy(tcx.mk_fn_sig(
761 [i8p, i8p].iter().cloned(),
764 hir::Unsafety::Unsafe,
767 // `unsafe fn(unsafe fn(*mut i8) -> (), *mut i8, unsafe fn(*mut i8, *mut i8) -> ()) -> i32`
768 let rust_fn_sig = ty::Binder::dummy(cx.tcx.mk_fn_sig(
769 vec![try_fn_ty, i8p, catch_fn_ty].into_iter(),
772 hir::Unsafety::Unsafe,
775 let rust_try = gen_fn(cx, "__rust_try", rust_fn_sig, codegen);
776 cx.rust_try_fn.set(Some(rust_try));
780 fn generic_simd_intrinsic(
781 bx: &mut Builder<'a, 'll, 'tcx>,
784 args: &[OperandRef<'tcx, &'ll Value>],
788 ) -> Result<&'ll Value, ()> {
789 // macros for error handling:
790 macro_rules! emit_error {
794 ($msg: tt, $($fmt: tt)*) => {
795 span_invalid_monomorphization_error(
797 &format!(concat!("invalid monomorphization of `{}` intrinsic: ", $msg),
802 macro_rules! return_error {
805 emit_error!($($fmt)*);
811 macro_rules! require {
812 ($cond: expr, $($fmt: tt)*) => {
814 return_error!($($fmt)*);
819 macro_rules! require_simd {
820 ($ty: expr, $position: expr) => {
821 require!($ty.is_simd(), "expected SIMD {} type, found non-SIMD `{}`", $position, $ty)
827 tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), callee_ty.fn_sig(tcx));
828 let arg_tys = sig.inputs();
829 let name_str = &*name.as_str();
831 if name == sym::simd_select_bitmask {
832 let in_ty = arg_tys[0];
833 let m_len = match in_ty.kind() {
834 // Note that this `.unwrap()` crashes for isize/usize, that's sort
835 // of intentional as there's not currently a use case for that.
836 ty::Int(i) => i.bit_width().unwrap(),
837 ty::Uint(i) => i.bit_width().unwrap(),
838 _ => return_error!("`{}` is not an integral type", in_ty),
840 require_simd!(arg_tys[1], "argument");
841 let (v_len, _) = arg_tys[1].simd_size_and_type(bx.tcx());
843 // Allow masks for vectors with fewer than 8 elements to be
844 // represented with a u8 or i8.
845 m_len == v_len || (m_len == 8 && v_len < 8),
846 "mismatched lengths: mask length `{}` != other vector length `{}`",
850 let i1 = bx.type_i1();
851 let im = bx.type_ix(v_len);
852 let i1xn = bx.type_vector(i1, v_len);
853 let m_im = bx.trunc(args[0].immediate(), im);
854 let m_i1s = bx.bitcast(m_im, i1xn);
855 return Ok(bx.select(m_i1s, args[1].immediate(), args[2].immediate()));
858 // every intrinsic below takes a SIMD vector as its first argument
859 require_simd!(arg_tys[0], "input");
860 let in_ty = arg_tys[0];
862 let comparison = match name {
863 sym::simd_eq => Some(hir::BinOpKind::Eq),
864 sym::simd_ne => Some(hir::BinOpKind::Ne),
865 sym::simd_lt => Some(hir::BinOpKind::Lt),
866 sym::simd_le => Some(hir::BinOpKind::Le),
867 sym::simd_gt => Some(hir::BinOpKind::Gt),
868 sym::simd_ge => Some(hir::BinOpKind::Ge),
872 let (in_len, in_elem) = arg_tys[0].simd_size_and_type(bx.tcx());
873 if let Some(cmp_op) = comparison {
874 require_simd!(ret_ty, "return");
876 let (out_len, out_ty) = ret_ty.simd_size_and_type(bx.tcx());
879 "expected return type with length {} (same as input type `{}`), \
880 found `{}` with length {}",
887 bx.type_kind(bx.element_type(llret_ty)) == TypeKind::Integer,
888 "expected return type with integer elements, found `{}` with non-integer `{}`",
893 return Ok(compare_simd_types(
903 if let Some(stripped) = name_str.strip_prefix("simd_shuffle") {
904 let n: u64 = stripped.parse().unwrap_or_else(|_| {
905 span_bug!(span, "bad `simd_shuffle` instruction only caught in codegen?")
908 require_simd!(ret_ty, "return");
910 let (out_len, out_ty) = ret_ty.simd_size_and_type(bx.tcx());
913 "expected return type of length {}, found `{}` with length {}",
920 "expected return element type `{}` (element of input `{}`), \
921 found `{}` with element type `{}`",
928 let total_len = u128::from(in_len) * 2;
930 let vector = args[2].immediate();
932 let indices: Option<Vec<_>> = (0..n)
935 let val = bx.const_get_elt(vector, i as u64);
936 match bx.const_to_opt_u128(val, true) {
938 emit_error!("shuffle index #{} is not a constant", arg_idx);
941 Some(idx) if idx >= total_len => {
943 "shuffle index #{} is out of bounds (limit {})",
949 Some(idx) => Some(bx.const_i32(idx as i32)),
953 let indices = match indices {
955 None => return Ok(bx.const_null(llret_ty)),
958 return Ok(bx.shuffle_vector(
961 bx.const_vector(&indices),
965 if name == sym::simd_insert {
967 in_elem == arg_tys[2],
968 "expected inserted type `{}` (element of input `{}`), found `{}`",
973 return Ok(bx.insert_element(
979 if name == sym::simd_extract {
982 "expected return type `{}` (element of input `{}`), found `{}`",
987 return Ok(bx.extract_element(args[0].immediate(), args[1].immediate()));
990 if name == sym::simd_select {
991 let m_elem_ty = in_elem;
993 require_simd!(arg_tys[1], "argument");
994 let (v_len, _) = arg_tys[1].simd_size_and_type(bx.tcx());
997 "mismatched lengths: mask length `{}` != other vector length `{}`",
1001 match m_elem_ty.kind() {
1003 _ => return_error!("mask element type is `{}`, expected `i_`", m_elem_ty),
1005 // truncate the mask to a vector of i1s
1006 let i1 = bx.type_i1();
1007 let i1xn = bx.type_vector(i1, m_len as u64);
1008 let m_i1s = bx.trunc(args[0].immediate(), i1xn);
1009 return Ok(bx.select(m_i1s, args[1].immediate(), args[2].immediate()));
1012 if name == sym::simd_bitmask {
1013 // The `fn simd_bitmask(vector) -> unsigned integer` intrinsic takes a
1014 // vector mask and returns an unsigned integer containing the most
1015 // significant bit (MSB) of each lane.
1017 // If the vector has less than 8 lanes, an u8 is returned with zeroed
1019 let expected_int_bits = in_len.max(8);
1020 match ret_ty.kind() {
1021 ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => (),
1022 _ => return_error!("bitmask `{}`, expected `u{}`", ret_ty, expected_int_bits),
1025 // Integer vector <i{in_bitwidth} x in_len>:
1026 let (i_xn, in_elem_bitwidth) = match in_elem.kind() {
1028 args[0].immediate(),
1029 i.bit_width().unwrap_or_else(|| bx.data_layout().pointer_size.bits()),
1032 args[0].immediate(),
1033 i.bit_width().unwrap_or_else(|| bx.data_layout().pointer_size.bits()),
1036 "vector argument `{}`'s element type `{}`, expected integer element type",
1042 // Shift the MSB to the right by "in_elem_bitwidth - 1" into the first bit position.
1045 bx.cx.const_int(bx.type_ix(in_elem_bitwidth), (in_elem_bitwidth - 1) as _);
1048 let i_xn_msb = bx.lshr(i_xn, bx.const_vector(shift_indices.as_slice()));
1049 // Truncate vector to an <i1 x N>
1050 let i1xn = bx.trunc(i_xn_msb, bx.type_vector(bx.type_i1(), in_len));
1051 // Bitcast <i1 x N> to iN:
1052 let i_ = bx.bitcast(i1xn, bx.type_ix(in_len));
1053 // Zero-extend iN to the bitmask type:
1054 return Ok(bx.zext(i_, bx.type_ix(expected_int_bits)));
1057 fn simd_simple_float_intrinsic(
1059 in_elem: &::rustc_middle::ty::TyS<'_>,
1060 in_ty: &::rustc_middle::ty::TyS<'_>,
1062 bx: &mut Builder<'a, 'll, 'tcx>,
1064 args: &[OperandRef<'tcx, &'ll Value>],
1065 ) -> Result<&'ll Value, ()> {
1066 macro_rules! emit_error {
1070 ($msg: tt, $($fmt: tt)*) => {
1071 span_invalid_monomorphization_error(
1073 &format!(concat!("invalid monomorphization of `{}` intrinsic: ", $msg),
1077 macro_rules! return_error {
1080 emit_error!($($fmt)*);
1086 let (elem_ty_str, elem_ty) = if let ty::Float(f) = in_elem.kind() {
1087 let elem_ty = bx.cx.type_float_from_ty(*f);
1088 match f.bit_width() {
1089 32 => ("f32", elem_ty),
1090 64 => ("f64", elem_ty),
1093 "unsupported element type `{}` of floating-point vector `{}`",
1100 return_error!("`{}` is not a floating-point type", in_ty);
1103 let vec_ty = bx.type_vector(elem_ty, in_len);
1105 let (intr_name, fn_ty) = match name {
1106 sym::simd_ceil => ("ceil", bx.type_func(&[vec_ty], vec_ty)),
1107 sym::simd_fabs => ("fabs", bx.type_func(&[vec_ty], vec_ty)),
1108 sym::simd_fcos => ("cos", bx.type_func(&[vec_ty], vec_ty)),
1109 sym::simd_fexp2 => ("exp2", bx.type_func(&[vec_ty], vec_ty)),
1110 sym::simd_fexp => ("exp", bx.type_func(&[vec_ty], vec_ty)),
1111 sym::simd_flog10 => ("log10", bx.type_func(&[vec_ty], vec_ty)),
1112 sym::simd_flog2 => ("log2", bx.type_func(&[vec_ty], vec_ty)),
1113 sym::simd_flog => ("log", bx.type_func(&[vec_ty], vec_ty)),
1114 sym::simd_floor => ("floor", bx.type_func(&[vec_ty], vec_ty)),
1115 sym::simd_fma => ("fma", bx.type_func(&[vec_ty, vec_ty, vec_ty], vec_ty)),
1116 sym::simd_fpowi => ("powi", bx.type_func(&[vec_ty, bx.type_i32()], vec_ty)),
1117 sym::simd_fpow => ("pow", bx.type_func(&[vec_ty, vec_ty], vec_ty)),
1118 sym::simd_fsin => ("sin", bx.type_func(&[vec_ty], vec_ty)),
1119 sym::simd_fsqrt => ("sqrt", bx.type_func(&[vec_ty], vec_ty)),
1120 sym::simd_round => ("round", bx.type_func(&[vec_ty], vec_ty)),
1121 sym::simd_trunc => ("trunc", bx.type_func(&[vec_ty], vec_ty)),
1122 _ => return_error!("unrecognized intrinsic `{}`", name),
1124 let llvm_name = &format!("llvm.{0}.v{1}{2}", intr_name, in_len, elem_ty_str);
1125 let f = bx.declare_cfn(&llvm_name, llvm::UnnamedAddr::No, fn_ty);
1126 let c = bx.call(f, &args.iter().map(|arg| arg.immediate()).collect::<Vec<_>>(), None);
1149 return simd_simple_float_intrinsic(name, in_elem, in_ty, in_len, bx, span, args);
1153 // https://github.com/llvm-mirror/llvm/blob/master/include/llvm/IR/Function.h#L182
1154 // https://github.com/llvm-mirror/llvm/blob/master/include/llvm/IR/Intrinsics.h#L81
1155 fn llvm_vector_str(elem_ty: Ty<'_>, vec_len: u64, no_pointers: usize) -> String {
1156 let p0s: String = "p0".repeat(no_pointers);
1157 match *elem_ty.kind() {
1158 ty::Int(v) => format!("v{}{}i{}", vec_len, p0s, v.bit_width().unwrap()),
1159 ty::Uint(v) => format!("v{}{}i{}", vec_len, p0s, v.bit_width().unwrap()),
1160 ty::Float(v) => format!("v{}{}f{}", vec_len, p0s, v.bit_width()),
1161 _ => unreachable!(),
1166 cx: &CodegenCx<'ll, '_>,
1169 mut no_pointers: usize,
1171 // FIXME: use cx.layout_of(ty).llvm_type() ?
1172 let mut elem_ty = match *elem_ty.kind() {
1173 ty::Int(v) => cx.type_int_from_ty(v),
1174 ty::Uint(v) => cx.type_uint_from_ty(v),
1175 ty::Float(v) => cx.type_float_from_ty(v),
1176 _ => unreachable!(),
1178 while no_pointers > 0 {
1179 elem_ty = cx.type_ptr_to(elem_ty);
1182 cx.type_vector(elem_ty, vec_len)
1185 if name == sym::simd_gather {
1186 // simd_gather(values: <N x T>, pointers: <N x *_ T>,
1187 // mask: <N x i{M}>) -> <N x T>
1188 // * N: number of elements in the input vectors
1189 // * T: type of the element to load
1190 // * M: any integer width is supported, will be truncated to i1
1192 // All types must be simd vector types
1193 require_simd!(in_ty, "first");
1194 require_simd!(arg_tys[1], "second");
1195 require_simd!(arg_tys[2], "third");
1196 require_simd!(ret_ty, "return");
1198 // Of the same length:
1199 let (out_len, _) = arg_tys[1].simd_size_and_type(bx.tcx());
1200 let (out_len2, _) = arg_tys[2].simd_size_and_type(bx.tcx());
1203 "expected {} argument with length {} (same as input type `{}`), \
1204 found `{}` with length {}",
1213 "expected {} argument with length {} (same as input type `{}`), \
1214 found `{}` with length {}",
1222 // The return type must match the first argument type
1223 require!(ret_ty == in_ty, "expected return type `{}`, found `{}`", in_ty, ret_ty);
1225 // This counts how many pointers
1226 fn ptr_count(t: Ty<'_>) -> usize {
1228 ty::RawPtr(p) => 1 + ptr_count(p.ty),
1234 fn non_ptr(t: Ty<'_>) -> Ty<'_> {
1236 ty::RawPtr(p) => non_ptr(p.ty),
1241 // The second argument must be a simd vector with an element type that's a pointer
1242 // to the element type of the first argument
1243 let (_, element_ty0) = arg_tys[0].simd_size_and_type(bx.tcx());
1244 let (_, element_ty1) = arg_tys[1].simd_size_and_type(bx.tcx());
1245 let (pointer_count, underlying_ty) = match element_ty1.kind() {
1246 ty::RawPtr(p) if p.ty == in_elem => (ptr_count(element_ty1), non_ptr(element_ty1)),
1250 "expected element type `{}` of second argument `{}` \
1251 to be a pointer to the element type `{}` of the first \
1252 argument `{}`, found `{}` != `*_ {}`",
1263 assert!(pointer_count > 0);
1264 assert_eq!(pointer_count - 1, ptr_count(element_ty0));
1265 assert_eq!(underlying_ty, non_ptr(element_ty0));
1267 // The element type of the third argument must be a signed integer type of any width:
1268 let (_, element_ty2) = arg_tys[2].simd_size_and_type(bx.tcx());
1269 match element_ty2.kind() {
1274 "expected element type `{}` of third argument `{}` \
1275 to be a signed integer type",
1282 // Alignment of T, must be a constant integer value:
1283 let alignment_ty = bx.type_i32();
1284 let alignment = bx.const_i32(bx.align_of(in_elem).bytes() as i32);
1286 // Truncate the mask vector to a vector of i1s:
1287 let (mask, mask_ty) = {
1288 let i1 = bx.type_i1();
1289 let i1xn = bx.type_vector(i1, in_len);
1290 (bx.trunc(args[2].immediate(), i1xn), i1xn)
1293 // Type of the vector of pointers:
1294 let llvm_pointer_vec_ty = llvm_vector_ty(bx, underlying_ty, in_len, pointer_count);
1295 let llvm_pointer_vec_str = llvm_vector_str(underlying_ty, in_len, pointer_count);
1297 // Type of the vector of elements:
1298 let llvm_elem_vec_ty = llvm_vector_ty(bx, underlying_ty, in_len, pointer_count - 1);
1299 let llvm_elem_vec_str = llvm_vector_str(underlying_ty, in_len, pointer_count - 1);
1301 let llvm_intrinsic =
1302 format!("llvm.masked.gather.{}.{}", llvm_elem_vec_str, llvm_pointer_vec_str);
1303 let f = bx.declare_cfn(
1305 llvm::UnnamedAddr::No,
1307 &[llvm_pointer_vec_ty, alignment_ty, mask_ty, llvm_elem_vec_ty],
1311 let v = bx.call(f, &[args[1].immediate(), alignment, mask, args[0].immediate()], None);
1315 if name == sym::simd_scatter {
1316 // simd_scatter(values: <N x T>, pointers: <N x *mut T>,
1317 // mask: <N x i{M}>) -> ()
1318 // * N: number of elements in the input vectors
1319 // * T: type of the element to load
1320 // * M: any integer width is supported, will be truncated to i1
1322 // All types must be simd vector types
1323 require_simd!(in_ty, "first");
1324 require_simd!(arg_tys[1], "second");
1325 require_simd!(arg_tys[2], "third");
1327 // Of the same length:
1328 let (element_len1, _) = arg_tys[1].simd_size_and_type(bx.tcx());
1329 let (element_len2, _) = arg_tys[2].simd_size_and_type(bx.tcx());
1331 in_len == element_len1,
1332 "expected {} argument with length {} (same as input type `{}`), \
1333 found `{}` with length {}",
1341 in_len == element_len2,
1342 "expected {} argument with length {} (same as input type `{}`), \
1343 found `{}` with length {}",
1351 // This counts how many pointers
1352 fn ptr_count(t: Ty<'_>) -> usize {
1354 ty::RawPtr(p) => 1 + ptr_count(p.ty),
1360 fn non_ptr(t: Ty<'_>) -> Ty<'_> {
1362 ty::RawPtr(p) => non_ptr(p.ty),
1367 // The second argument must be a simd vector with an element type that's a pointer
1368 // to the element type of the first argument
1369 let (_, element_ty0) = arg_tys[0].simd_size_and_type(bx.tcx());
1370 let (_, element_ty1) = arg_tys[1].simd_size_and_type(bx.tcx());
1371 let (_, element_ty2) = arg_tys[2].simd_size_and_type(bx.tcx());
1372 let (pointer_count, underlying_ty) = match element_ty1.kind() {
1373 ty::RawPtr(p) if p.ty == in_elem && p.mutbl == hir::Mutability::Mut => {
1374 (ptr_count(element_ty1), non_ptr(element_ty1))
1379 "expected element type `{}` of second argument `{}` \
1380 to be a pointer to the element type `{}` of the first \
1381 argument `{}`, found `{}` != `*mut {}`",
1392 assert!(pointer_count > 0);
1393 assert_eq!(pointer_count - 1, ptr_count(element_ty0));
1394 assert_eq!(underlying_ty, non_ptr(element_ty0));
1396 // The element type of the third argument must be a signed integer type of any width:
1397 match element_ty2.kind() {
1402 "expected element type `{}` of third argument `{}` \
1403 be a signed integer type",
1410 // Alignment of T, must be a constant integer value:
1411 let alignment_ty = bx.type_i32();
1412 let alignment = bx.const_i32(bx.align_of(in_elem).bytes() as i32);
1414 // Truncate the mask vector to a vector of i1s:
1415 let (mask, mask_ty) = {
1416 let i1 = bx.type_i1();
1417 let i1xn = bx.type_vector(i1, in_len);
1418 (bx.trunc(args[2].immediate(), i1xn), i1xn)
1421 let ret_t = bx.type_void();
1423 // Type of the vector of pointers:
1424 let llvm_pointer_vec_ty = llvm_vector_ty(bx, underlying_ty, in_len, pointer_count);
1425 let llvm_pointer_vec_str = llvm_vector_str(underlying_ty, in_len, pointer_count);
1427 // Type of the vector of elements:
1428 let llvm_elem_vec_ty = llvm_vector_ty(bx, underlying_ty, in_len, pointer_count - 1);
1429 let llvm_elem_vec_str = llvm_vector_str(underlying_ty, in_len, pointer_count - 1);
1431 let llvm_intrinsic =
1432 format!("llvm.masked.scatter.{}.{}", llvm_elem_vec_str, llvm_pointer_vec_str);
1433 let f = bx.declare_cfn(
1435 llvm::UnnamedAddr::No,
1436 bx.type_func(&[llvm_elem_vec_ty, llvm_pointer_vec_ty, alignment_ty, mask_ty], ret_t),
1438 let v = bx.call(f, &[args[0].immediate(), args[1].immediate(), alignment, mask], None);
1442 macro_rules! arith_red {
1443 ($name:ident : $integer_reduce:ident, $float_reduce:ident, $ordered:expr, $op:ident,
1444 $identity:expr) => {
1445 if name == sym::$name {
1448 "expected return type `{}` (element of input `{}`), found `{}`",
1453 return match in_elem.kind() {
1454 ty::Int(_) | ty::Uint(_) => {
1455 let r = bx.$integer_reduce(args[0].immediate());
1457 // if overflow occurs, the result is the
1458 // mathematical result modulo 2^n:
1459 Ok(bx.$op(args[1].immediate(), r))
1461 Ok(bx.$integer_reduce(args[0].immediate()))
1465 let acc = if $ordered {
1466 // ordered arithmetic reductions take an accumulator
1469 // unordered arithmetic reductions use the identity accumulator
1470 match f.bit_width() {
1471 32 => bx.const_real(bx.type_f32(), $identity),
1472 64 => bx.const_real(bx.type_f64(), $identity),
1475 unsupported {} from `{}` with element `{}` of size `{}` to `{}`"#,
1484 Ok(bx.$float_reduce(acc, args[0].immediate()))
1487 "unsupported {} from `{}` with element `{}` to `{}`",
1498 arith_red!(simd_reduce_add_ordered: vector_reduce_add, vector_reduce_fadd, true, add, 0.0);
1499 arith_red!(simd_reduce_mul_ordered: vector_reduce_mul, vector_reduce_fmul, true, mul, 1.0);
1501 simd_reduce_add_unordered: vector_reduce_add,
1502 vector_reduce_fadd_fast,
1508 simd_reduce_mul_unordered: vector_reduce_mul,
1509 vector_reduce_fmul_fast,
1515 macro_rules! minmax_red {
1516 ($name:ident: $int_red:ident, $float_red:ident) => {
1517 if name == sym::$name {
1520 "expected return type `{}` (element of input `{}`), found `{}`",
1525 return match in_elem.kind() {
1526 ty::Int(_i) => Ok(bx.$int_red(args[0].immediate(), true)),
1527 ty::Uint(_u) => Ok(bx.$int_red(args[0].immediate(), false)),
1528 ty::Float(_f) => Ok(bx.$float_red(args[0].immediate())),
1530 "unsupported {} from `{}` with element `{}` to `{}`",
1541 minmax_red!(simd_reduce_min: vector_reduce_min, vector_reduce_fmin);
1542 minmax_red!(simd_reduce_max: vector_reduce_max, vector_reduce_fmax);
1544 minmax_red!(simd_reduce_min_nanless: vector_reduce_min, vector_reduce_fmin_fast);
1545 minmax_red!(simd_reduce_max_nanless: vector_reduce_max, vector_reduce_fmax_fast);
1547 macro_rules! bitwise_red {
1548 ($name:ident : $red:ident, $boolean:expr) => {
1549 if name == sym::$name {
1550 let input = if !$boolean {
1553 "expected return type `{}` (element of input `{}`), found `{}`",
1560 match in_elem.kind() {
1561 ty::Int(_) | ty::Uint(_) => {}
1563 "unsupported {} from `{}` with element `{}` to `{}`",
1571 // boolean reductions operate on vectors of i1s:
1572 let i1 = bx.type_i1();
1573 let i1xn = bx.type_vector(i1, in_len as u64);
1574 bx.trunc(args[0].immediate(), i1xn)
1576 return match in_elem.kind() {
1577 ty::Int(_) | ty::Uint(_) => {
1578 let r = bx.$red(input);
1579 Ok(if !$boolean { r } else { bx.zext(r, bx.type_bool()) })
1582 "unsupported {} from `{}` with element `{}` to `{}`",
1593 bitwise_red!(simd_reduce_and: vector_reduce_and, false);
1594 bitwise_red!(simd_reduce_or: vector_reduce_or, false);
1595 bitwise_red!(simd_reduce_xor: vector_reduce_xor, false);
1596 bitwise_red!(simd_reduce_all: vector_reduce_and, true);
1597 bitwise_red!(simd_reduce_any: vector_reduce_or, true);
1599 if name == sym::simd_cast {
1600 require_simd!(ret_ty, "return");
1601 let (out_len, out_elem) = ret_ty.simd_size_and_type(bx.tcx());
1604 "expected return type with length {} (same as input type `{}`), \
1605 found `{}` with length {}",
1611 // casting cares about nominal type, not just structural type
1612 if in_elem == out_elem {
1613 return Ok(args[0].immediate());
1618 Int(/* is signed? */ bool),
1622 let (in_style, in_width) = match in_elem.kind() {
1623 // vectors of pointer-sized integers should've been
1624 // disallowed before here, so this unwrap is safe.
1625 ty::Int(i) => (Style::Int(true), i.bit_width().unwrap()),
1626 ty::Uint(u) => (Style::Int(false), u.bit_width().unwrap()),
1627 ty::Float(f) => (Style::Float, f.bit_width()),
1628 _ => (Style::Unsupported, 0),
1630 let (out_style, out_width) = match out_elem.kind() {
1631 ty::Int(i) => (Style::Int(true), i.bit_width().unwrap()),
1632 ty::Uint(u) => (Style::Int(false), u.bit_width().unwrap()),
1633 ty::Float(f) => (Style::Float, f.bit_width()),
1634 _ => (Style::Unsupported, 0),
1637 match (in_style, out_style) {
1638 (Style::Int(in_is_signed), Style::Int(_)) => {
1639 return Ok(match in_width.cmp(&out_width) {
1640 Ordering::Greater => bx.trunc(args[0].immediate(), llret_ty),
1641 Ordering::Equal => args[0].immediate(),
1644 bx.sext(args[0].immediate(), llret_ty)
1646 bx.zext(args[0].immediate(), llret_ty)
1651 (Style::Int(in_is_signed), Style::Float) => {
1652 return Ok(if in_is_signed {
1653 bx.sitofp(args[0].immediate(), llret_ty)
1655 bx.uitofp(args[0].immediate(), llret_ty)
1658 (Style::Float, Style::Int(out_is_signed)) => {
1659 return Ok(if out_is_signed {
1660 bx.fptosi(args[0].immediate(), llret_ty)
1662 bx.fptoui(args[0].immediate(), llret_ty)
1665 (Style::Float, Style::Float) => {
1666 return Ok(match in_width.cmp(&out_width) {
1667 Ordering::Greater => bx.fptrunc(args[0].immediate(), llret_ty),
1668 Ordering::Equal => args[0].immediate(),
1669 Ordering::Less => bx.fpext(args[0].immediate(), llret_ty),
1672 _ => { /* Unsupported. Fallthrough. */ }
1676 "unsupported cast from `{}` with element `{}` to `{}` with element `{}`",
1683 macro_rules! arith_binary {
1684 ($($name: ident: $($($p: ident),* => $call: ident),*;)*) => {
1685 $(if name == sym::$name {
1686 match in_elem.kind() {
1687 $($(ty::$p(_))|* => {
1688 return Ok(bx.$call(args[0].immediate(), args[1].immediate()))
1693 "unsupported operation on `{}` with element `{}`",
1700 simd_add: Uint, Int => add, Float => fadd;
1701 simd_sub: Uint, Int => sub, Float => fsub;
1702 simd_mul: Uint, Int => mul, Float => fmul;
1703 simd_div: Uint => udiv, Int => sdiv, Float => fdiv;
1704 simd_rem: Uint => urem, Int => srem, Float => frem;
1705 simd_shl: Uint, Int => shl;
1706 simd_shr: Uint => lshr, Int => ashr;
1707 simd_and: Uint, Int => and;
1708 simd_or: Uint, Int => or;
1709 simd_xor: Uint, Int => xor;
1710 simd_fmax: Float => maxnum;
1711 simd_fmin: Float => minnum;
1714 macro_rules! arith_unary {
1715 ($($name: ident: $($($p: ident),* => $call: ident),*;)*) => {
1716 $(if name == sym::$name {
1717 match in_elem.kind() {
1718 $($(ty::$p(_))|* => {
1719 return Ok(bx.$call(args[0].immediate()))
1724 "unsupported operation on `{}` with element `{}`",
1731 simd_neg: Int => neg, Float => fneg;
1734 if name == sym::simd_saturating_add || name == sym::simd_saturating_sub {
1735 let lhs = args[0].immediate();
1736 let rhs = args[1].immediate();
1737 let is_add = name == sym::simd_saturating_add;
1738 let ptr_bits = bx.tcx().data_layout.pointer_size.bits() as _;
1739 let (signed, elem_width, elem_ty) = match *in_elem.kind() {
1740 ty::Int(i) => (true, i.bit_width().unwrap_or(ptr_bits), bx.cx.type_int_from_ty(i)),
1741 ty::Uint(i) => (false, i.bit_width().unwrap_or(ptr_bits), bx.cx.type_uint_from_ty(i)),
1744 "expected element type `{}` of vector type `{}` \
1745 to be a signed or unsigned integer type",
1746 arg_tys[0].simd_size_and_type(bx.tcx()).1,
1751 let llvm_intrinsic = &format!(
1752 "llvm.{}{}.sat.v{}i{}",
1753 if signed { 's' } else { 'u' },
1754 if is_add { "add" } else { "sub" },
1758 let vec_ty = bx.cx.type_vector(elem_ty, in_len as u64);
1760 let f = bx.declare_cfn(
1762 llvm::UnnamedAddr::No,
1763 bx.type_func(&[vec_ty, vec_ty], vec_ty),
1765 let v = bx.call(f, &[lhs, rhs], None);
1769 span_bug!(span, "unknown SIMD intrinsic");
1772 // Returns the width of an int Ty, and if it's signed or not
1773 // Returns None if the type is not an integer
1774 // FIXME: there’s multiple of this functions, investigate using some of the already existing
1776 fn int_type_width_signed(ty: Ty<'_>, cx: &CodegenCx<'_, '_>) -> Option<(u64, bool)> {
1779 Some((t.bit_width().unwrap_or(u64::from(cx.tcx.sess.target.pointer_width)), true))
1782 Some((t.bit_width().unwrap_or(u64::from(cx.tcx.sess.target.pointer_width)), false))