1 use crate::abi::FnAbiLlvmExt;
3 use crate::common::Funclet;
4 use crate::context::CodegenCx;
5 use crate::llvm::{self, AtomicOrdering, AtomicRmwBinOp, BasicBlock};
6 use crate::type_::Type;
7 use crate::type_of::LayoutLlvmExt;
8 use crate::value::Value;
10 use libc::{c_char, c_uint};
11 use rustc_codegen_ssa::common::{IntPredicate, RealPredicate, SynchronizationScope, TypeKind};
12 use rustc_codegen_ssa::mir::operand::{OperandRef, OperandValue};
13 use rustc_codegen_ssa::mir::place::PlaceRef;
14 use rustc_codegen_ssa::traits::*;
15 use rustc_codegen_ssa::MemFlags;
16 use rustc_data_structures::small_c_str::SmallCStr;
17 use rustc_hir::def_id::DefId;
18 use rustc_middle::ty::layout::{
19 FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers, TyAndLayout,
21 use rustc_middle::ty::{self, Ty, TyCtxt};
23 use rustc_target::abi::{self, call::FnAbi, Align, Size, WrappingRange};
24 use rustc_target::spec::{HasTargetSpec, Target};
31 // All Builders must have an llfn associated with them
33 pub struct Builder<'a, 'll, 'tcx> {
34 pub llbuilder: &'ll mut llvm::Builder<'ll>,
35 pub cx: &'a CodegenCx<'ll, 'tcx>,
38 impl Drop for Builder<'_, '_, '_> {
41 llvm::LLVMDisposeBuilder(&mut *(self.llbuilder as *mut _));
46 // FIXME(eddyb) use a checked constructor when they become `const fn`.
47 const EMPTY_C_STR: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"\0") };
49 /// Empty string, to be used where LLVM expects an instruction name, indicating
50 /// that the instruction is to be left unnamed (i.e. numbered, in textual IR).
51 // FIXME(eddyb) pass `&CStr` directly to FFI once it's a thin pointer.
52 const UNNAMED: *const c_char = EMPTY_C_STR.as_ptr();
54 impl<'ll, 'tcx> BackendTypes for Builder<'_, 'll, 'tcx> {
55 type Value = <CodegenCx<'ll, 'tcx> as BackendTypes>::Value;
56 type Function = <CodegenCx<'ll, 'tcx> as BackendTypes>::Function;
57 type BasicBlock = <CodegenCx<'ll, 'tcx> as BackendTypes>::BasicBlock;
58 type Type = <CodegenCx<'ll, 'tcx> as BackendTypes>::Type;
59 type Funclet = <CodegenCx<'ll, 'tcx> as BackendTypes>::Funclet;
61 type DIScope = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIScope;
62 type DILocation = <CodegenCx<'ll, 'tcx> as BackendTypes>::DILocation;
63 type DIVariable = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIVariable;
66 impl abi::HasDataLayout for Builder<'_, '_, '_> {
67 fn data_layout(&self) -> &abi::TargetDataLayout {
72 impl<'tcx> ty::layout::HasTyCtxt<'tcx> for Builder<'_, '_, 'tcx> {
74 fn tcx(&self) -> TyCtxt<'tcx> {
79 impl<'tcx> ty::layout::HasParamEnv<'tcx> for Builder<'_, '_, 'tcx> {
80 fn param_env(&self) -> ty::ParamEnv<'tcx> {
85 impl HasTargetSpec for Builder<'_, '_, '_> {
87 fn target_spec(&self) -> &Target {
92 impl<'tcx> LayoutOfHelpers<'tcx> for Builder<'_, '_, 'tcx> {
93 type LayoutOfResult = TyAndLayout<'tcx>;
96 fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
97 self.cx.handle_layout_err(err, span, ty)
101 impl<'tcx> FnAbiOfHelpers<'tcx> for Builder<'_, '_, 'tcx> {
102 type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>;
105 fn handle_fn_abi_err(
107 err: FnAbiError<'tcx>,
109 fn_abi_request: FnAbiRequest<'tcx>,
111 self.cx.handle_fn_abi_err(err, span, fn_abi_request)
115 impl<'ll, 'tcx> Deref for Builder<'_, 'll, 'tcx> {
116 type Target = CodegenCx<'ll, 'tcx>;
119 fn deref(&self) -> &Self::Target {
124 impl<'ll, 'tcx> HasCodegen<'tcx> for Builder<'_, 'll, 'tcx> {
125 type CodegenCx = CodegenCx<'ll, 'tcx>;
128 macro_rules! builder_methods_for_value_instructions {
129 ($($name:ident($($arg:ident),*) => $llvm_capi:ident),+ $(,)?) => {
130 $(fn $name(&mut self, $($arg: &'ll Value),*) -> &'ll Value {
132 llvm::$llvm_capi(self.llbuilder, $($arg,)* UNNAMED)
138 impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
139 fn build(cx: &'a CodegenCx<'ll, 'tcx>, llbb: &'ll BasicBlock) -> Self {
140 let bx = Builder::with_cx(cx);
142 llvm::LLVMPositionBuilderAtEnd(bx.llbuilder, llbb);
147 fn cx(&self) -> &CodegenCx<'ll, 'tcx> {
151 fn llbb(&self) -> &'ll BasicBlock {
152 unsafe { llvm::LLVMGetInsertBlock(self.llbuilder) }
155 fn set_span(&mut self, _span: Span) {}
157 fn append_block(cx: &'a CodegenCx<'ll, 'tcx>, llfn: &'ll Value, name: &str) -> &'ll BasicBlock {
159 let name = SmallCStr::new(name);
160 llvm::LLVMAppendBasicBlockInContext(cx.llcx, llfn, name.as_ptr())
164 fn append_sibling_block(&mut self, name: &str) -> &'ll BasicBlock {
165 Self::append_block(self.cx, self.llfn(), name)
168 fn switch_to_block(&mut self, llbb: Self::BasicBlock) {
169 *self = Self::build(self.cx, llbb)
172 fn ret_void(&mut self) {
174 llvm::LLVMBuildRetVoid(self.llbuilder);
178 fn ret(&mut self, v: &'ll Value) {
180 llvm::LLVMBuildRet(self.llbuilder, v);
184 fn br(&mut self, dest: &'ll BasicBlock) {
186 llvm::LLVMBuildBr(self.llbuilder, dest);
193 then_llbb: &'ll BasicBlock,
194 else_llbb: &'ll BasicBlock,
197 llvm::LLVMBuildCondBr(self.llbuilder, cond, then_llbb, else_llbb);
204 else_llbb: &'ll BasicBlock,
205 cases: impl ExactSizeIterator<Item = (u128, &'ll BasicBlock)>,
208 unsafe { llvm::LLVMBuildSwitch(self.llbuilder, v, else_llbb, cases.len() as c_uint) };
209 for (on_val, dest) in cases {
210 let on_val = self.const_uint_big(self.val_ty(v), on_val);
211 unsafe { llvm::LLVMAddCase(switch, on_val, dest) }
218 fn_abi: Option<&FnAbi<'tcx, Ty<'tcx>>>,
221 then: &'ll BasicBlock,
222 catch: &'ll BasicBlock,
223 funclet: Option<&Funclet<'ll>>,
225 debug!("invoke {:?} with args ({:?})", llfn, args);
227 let args = self.check_call("invoke", llty, llfn, args);
228 let bundle = funclet.map(|funclet| funclet.bundle());
229 let bundle = bundle.as_ref().map(|b| &*b.raw);
231 let invoke = unsafe {
232 llvm::LLVMRustBuildInvoke(
237 args.len() as c_uint,
244 if let Some(fn_abi) = fn_abi {
245 fn_abi.apply_attrs_callsite(self, invoke);
250 fn unreachable(&mut self) {
252 llvm::LLVMBuildUnreachable(self.llbuilder);
256 builder_methods_for_value_instructions! {
257 add(a, b) => LLVMBuildAdd,
258 fadd(a, b) => LLVMBuildFAdd,
259 sub(a, b) => LLVMBuildSub,
260 fsub(a, b) => LLVMBuildFSub,
261 mul(a, b) => LLVMBuildMul,
262 fmul(a, b) => LLVMBuildFMul,
263 udiv(a, b) => LLVMBuildUDiv,
264 exactudiv(a, b) => LLVMBuildExactUDiv,
265 sdiv(a, b) => LLVMBuildSDiv,
266 exactsdiv(a, b) => LLVMBuildExactSDiv,
267 fdiv(a, b) => LLVMBuildFDiv,
268 urem(a, b) => LLVMBuildURem,
269 srem(a, b) => LLVMBuildSRem,
270 frem(a, b) => LLVMBuildFRem,
271 shl(a, b) => LLVMBuildShl,
272 lshr(a, b) => LLVMBuildLShr,
273 ashr(a, b) => LLVMBuildAShr,
274 and(a, b) => LLVMBuildAnd,
275 or(a, b) => LLVMBuildOr,
276 xor(a, b) => LLVMBuildXor,
277 neg(x) => LLVMBuildNeg,
278 fneg(x) => LLVMBuildFNeg,
279 not(x) => LLVMBuildNot,
280 unchecked_sadd(x, y) => LLVMBuildNSWAdd,
281 unchecked_uadd(x, y) => LLVMBuildNUWAdd,
282 unchecked_ssub(x, y) => LLVMBuildNSWSub,
283 unchecked_usub(x, y) => LLVMBuildNUWSub,
284 unchecked_smul(x, y) => LLVMBuildNSWMul,
285 unchecked_umul(x, y) => LLVMBuildNUWMul,
288 fn fadd_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
290 let instr = llvm::LLVMBuildFAdd(self.llbuilder, lhs, rhs, UNNAMED);
291 llvm::LLVMRustSetFastMath(instr);
296 fn fsub_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
298 let instr = llvm::LLVMBuildFSub(self.llbuilder, lhs, rhs, UNNAMED);
299 llvm::LLVMRustSetFastMath(instr);
304 fn fmul_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
306 let instr = llvm::LLVMBuildFMul(self.llbuilder, lhs, rhs, UNNAMED);
307 llvm::LLVMRustSetFastMath(instr);
312 fn fdiv_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
314 let instr = llvm::LLVMBuildFDiv(self.llbuilder, lhs, rhs, UNNAMED);
315 llvm::LLVMRustSetFastMath(instr);
320 fn frem_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
322 let instr = llvm::LLVMBuildFRem(self.llbuilder, lhs, rhs, UNNAMED);
323 llvm::LLVMRustSetFastMath(instr);
334 ) -> (Self::Value, Self::Value) {
335 use rustc_middle::ty::{Int, Uint};
336 use rustc_middle::ty::{IntTy::*, UintTy::*};
338 let new_kind = match ty.kind() {
339 Int(t @ Isize) => Int(t.normalize(self.tcx.sess.target.pointer_width)),
340 Uint(t @ Usize) => Uint(t.normalize(self.tcx.sess.target.pointer_width)),
341 t @ (Uint(_) | Int(_)) => t.clone(),
342 _ => panic!("tried to get overflow intrinsic for op applied to non-int type"),
345 let name = match oop {
346 OverflowOp::Add => match new_kind {
347 Int(I8) => "llvm.sadd.with.overflow.i8",
348 Int(I16) => "llvm.sadd.with.overflow.i16",
349 Int(I32) => "llvm.sadd.with.overflow.i32",
350 Int(I64) => "llvm.sadd.with.overflow.i64",
351 Int(I128) => "llvm.sadd.with.overflow.i128",
353 Uint(U8) => "llvm.uadd.with.overflow.i8",
354 Uint(U16) => "llvm.uadd.with.overflow.i16",
355 Uint(U32) => "llvm.uadd.with.overflow.i32",
356 Uint(U64) => "llvm.uadd.with.overflow.i64",
357 Uint(U128) => "llvm.uadd.with.overflow.i128",
361 OverflowOp::Sub => match new_kind {
362 Int(I8) => "llvm.ssub.with.overflow.i8",
363 Int(I16) => "llvm.ssub.with.overflow.i16",
364 Int(I32) => "llvm.ssub.with.overflow.i32",
365 Int(I64) => "llvm.ssub.with.overflow.i64",
366 Int(I128) => "llvm.ssub.with.overflow.i128",
369 // Emit sub and icmp instead of llvm.usub.with.overflow. LLVM considers these
370 // to be the canonical form. It will attempt to reform llvm.usub.with.overflow
371 // in the backend if profitable.
372 let sub = self.sub(lhs, rhs);
373 let cmp = self.icmp(IntPredicate::IntULT, lhs, rhs);
379 OverflowOp::Mul => match new_kind {
380 Int(I8) => "llvm.smul.with.overflow.i8",
381 Int(I16) => "llvm.smul.with.overflow.i16",
382 Int(I32) => "llvm.smul.with.overflow.i32",
383 Int(I64) => "llvm.smul.with.overflow.i64",
384 Int(I128) => "llvm.smul.with.overflow.i128",
386 Uint(U8) => "llvm.umul.with.overflow.i8",
387 Uint(U16) => "llvm.umul.with.overflow.i16",
388 Uint(U32) => "llvm.umul.with.overflow.i32",
389 Uint(U64) => "llvm.umul.with.overflow.i64",
390 Uint(U128) => "llvm.umul.with.overflow.i128",
396 let res = self.call_intrinsic(name, &[lhs, rhs]);
397 (self.extract_value(res, 0), self.extract_value(res, 1))
400 fn from_immediate(&mut self, val: Self::Value) -> Self::Value {
401 if self.cx().val_ty(val) == self.cx().type_i1() {
402 self.zext(val, self.cx().type_i8())
407 fn to_immediate_scalar(&mut self, val: Self::Value, scalar: abi::Scalar) -> Self::Value {
408 if scalar.is_bool() {
409 return self.trunc(val, self.cx().type_i1());
414 fn alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
415 let mut bx = Builder::with_cx(self.cx);
416 bx.position_at_start(unsafe { llvm::LLVMGetFirstBasicBlock(self.llfn()) });
418 let alloca = llvm::LLVMBuildAlloca(bx.llbuilder, ty, UNNAMED);
419 llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
424 fn byte_array_alloca(&mut self, len: &'ll Value, align: Align) -> &'ll Value {
427 llvm::LLVMBuildArrayAlloca(self.llbuilder, self.cx().type_i8(), len, UNNAMED);
428 llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
433 fn load(&mut self, ty: &'ll Type, ptr: &'ll Value, align: Align) -> &'ll Value {
435 let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED);
436 llvm::LLVMSetAlignment(load, align.bytes() as c_uint);
441 fn volatile_load(&mut self, ty: &'ll Type, ptr: &'ll Value) -> &'ll Value {
443 let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED);
444 llvm::LLVMSetVolatile(load, llvm::True);
453 order: rustc_codegen_ssa::common::AtomicOrdering,
457 let load = llvm::LLVMRustBuildAtomicLoad(
462 AtomicOrdering::from_generic(order),
464 // LLVM requires the alignment of atomic loads to be at least the size of the type.
465 llvm::LLVMSetAlignment(load, size.bytes() as c_uint);
470 #[instrument(level = "trace", skip(self))]
471 fn load_operand(&mut self, place: PlaceRef<'tcx, &'ll Value>) -> OperandRef<'tcx, &'ll Value> {
472 assert_eq!(place.llextra.is_some(), place.layout.is_unsized());
474 if place.layout.is_zst() {
475 return OperandRef::new_zst(self, place.layout);
478 #[instrument(level = "trace", skip(bx))]
479 fn scalar_load_metadata<'a, 'll, 'tcx>(
480 bx: &mut Builder<'a, 'll, 'tcx>,
483 layout: TyAndLayout<'tcx>,
486 if !scalar.is_always_valid(bx) {
487 bx.noundef_metadata(load);
490 match scalar.primitive() {
492 if !scalar.is_always_valid(bx) {
493 bx.range_metadata(load, scalar.valid_range(bx));
497 if !scalar.valid_range(bx).contains(0) {
498 bx.nonnull_metadata(load);
501 if let Some(pointee) = layout.pointee_info_at(bx, offset) {
502 if let Some(_) = pointee.safe {
503 bx.align_metadata(load, pointee.align);
507 abi::F32 | abi::F64 => {}
511 let val = if let Some(llextra) = place.llextra {
512 OperandValue::Ref(place.llval, Some(llextra), place.align)
513 } else if place.layout.is_llvm_immediate() {
514 let mut const_llval = None;
515 let llty = place.layout.llvm_type(self);
517 if let Some(global) = llvm::LLVMIsAGlobalVariable(place.llval) {
518 if llvm::LLVMIsGlobalConstant(global) == llvm::True {
519 if let Some(init) = llvm::LLVMGetInitializer(global) {
520 if self.val_ty(init) == llty {
521 const_llval = Some(init);
527 let llval = const_llval.unwrap_or_else(|| {
528 let load = self.load(llty, place.llval, place.align);
529 if let abi::Abi::Scalar(scalar) = place.layout.abi {
530 scalar_load_metadata(self, load, scalar, place.layout, Size::ZERO);
534 OperandValue::Immediate(self.to_immediate(llval, place.layout))
535 } else if let abi::Abi::ScalarPair(a, b) = place.layout.abi {
536 let b_offset = a.size(self).align_to(b.align(self).abi);
537 let pair_ty = place.layout.llvm_type(self);
539 let mut load = |i, scalar: abi::Scalar, layout, align, offset| {
540 let llptr = self.struct_gep(pair_ty, place.llval, i as u64);
541 let llty = place.layout.scalar_pair_element_llvm_type(self, i, false);
542 let load = self.load(llty, llptr, align);
543 scalar_load_metadata(self, load, scalar, layout, offset);
544 self.to_immediate_scalar(load, scalar)
548 load(0, a, place.layout, place.align, Size::ZERO),
549 load(1, b, place.layout, place.align.restrict_for_offset(b_offset), b_offset),
552 OperandValue::Ref(place.llval, None, place.align)
555 OperandRef { val, layout: place.layout }
558 fn write_operand_repeatedly(
560 cg_elem: OperandRef<'tcx, &'ll Value>,
562 dest: PlaceRef<'tcx, &'ll Value>,
564 let zero = self.const_usize(0);
565 let count = self.const_usize(count);
566 let start = dest.project_index(self, zero).llval;
567 let end = dest.project_index(self, count).llval;
569 let header_bb = self.append_sibling_block("repeat_loop_header");
570 let body_bb = self.append_sibling_block("repeat_loop_body");
571 let next_bb = self.append_sibling_block("repeat_loop_next");
575 let mut header_bx = Self::build(self.cx, header_bb);
576 let current = header_bx.phi(self.val_ty(start), &[start], &[self.llbb()]);
578 let keep_going = header_bx.icmp(IntPredicate::IntNE, current, end);
579 header_bx.cond_br(keep_going, body_bb, next_bb);
581 let mut body_bx = Self::build(self.cx, body_bb);
582 let align = dest.align.restrict_for_offset(dest.layout.field(self.cx(), 0).size);
585 .store(&mut body_bx, PlaceRef::new_sized_aligned(current, cg_elem.layout, align));
587 let next = body_bx.inbounds_gep(
588 self.backend_type(cg_elem.layout),
590 &[self.const_usize(1)],
592 body_bx.br(header_bb);
593 header_bx.add_incoming_to_phi(current, next, body_bb);
595 *self = Self::build(self.cx, next_bb);
598 fn range_metadata(&mut self, load: &'ll Value, range: WrappingRange) {
599 if self.sess().target.arch == "amdgpu" {
600 // amdgpu/LLVM does something weird and thinks an i64 value is
601 // split into a v2i32, halving the bitwidth LLVM expects,
602 // tripping an assertion. So, for now, just disable this
608 let llty = self.cx.val_ty(load);
610 self.cx.const_uint_big(llty, range.start),
611 self.cx.const_uint_big(llty, range.end.wrapping_add(1)),
614 llvm::LLVMSetMetadata(
616 llvm::MD_range as c_uint,
617 llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
622 fn nonnull_metadata(&mut self, load: &'ll Value) {
624 llvm::LLVMSetMetadata(
626 llvm::MD_nonnull as c_uint,
627 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
632 fn store(&mut self, val: &'ll Value, ptr: &'ll Value, align: Align) -> &'ll Value {
633 self.store_with_flags(val, ptr, align, MemFlags::empty())
643 debug!("Store {:?} -> {:?} ({:?})", val, ptr, flags);
644 let ptr = self.check_store(val, ptr);
646 let store = llvm::LLVMBuildStore(self.llbuilder, val, ptr);
648 if flags.contains(MemFlags::UNALIGNED) { 1 } else { align.bytes() as c_uint };
649 llvm::LLVMSetAlignment(store, align);
650 if flags.contains(MemFlags::VOLATILE) {
651 llvm::LLVMSetVolatile(store, llvm::True);
653 if flags.contains(MemFlags::NONTEMPORAL) {
654 // According to LLVM [1] building a nontemporal store must
655 // *always* point to a metadata value of the integer 1.
657 // [1]: https://llvm.org/docs/LangRef.html#store-instruction
658 let one = self.cx.const_i32(1);
659 let node = llvm::LLVMMDNodeInContext(self.cx.llcx, &one, 1);
660 llvm::LLVMSetMetadata(store, llvm::MD_nontemporal as c_uint, node);
670 order: rustc_codegen_ssa::common::AtomicOrdering,
673 debug!("Store {:?} -> {:?}", val, ptr);
674 let ptr = self.check_store(val, ptr);
676 let store = llvm::LLVMRustBuildAtomicStore(
680 AtomicOrdering::from_generic(order),
682 // LLVM requires the alignment of atomic stores to be at least the size of the type.
683 llvm::LLVMSetAlignment(store, size.bytes() as c_uint);
687 fn gep(&mut self, ty: &'ll Type, ptr: &'ll Value, indices: &[&'ll Value]) -> &'ll Value {
694 indices.len() as c_uint,
704 indices: &[&'ll Value],
707 llvm::LLVMBuildInBoundsGEP2(
712 indices.len() as c_uint,
718 fn struct_gep(&mut self, ty: &'ll Type, ptr: &'ll Value, idx: u64) -> &'ll Value {
719 assert_eq!(idx as c_uint as u64, idx);
720 unsafe { llvm::LLVMBuildStructGEP2(self.llbuilder, ty, ptr, idx as c_uint, UNNAMED) }
724 fn trunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
725 unsafe { llvm::LLVMBuildTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
728 fn sext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
729 unsafe { llvm::LLVMBuildSExt(self.llbuilder, val, dest_ty, UNNAMED) }
732 fn fptoui_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
733 self.fptoint_sat(false, val, dest_ty)
736 fn fptosi_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
737 self.fptoint_sat(true, val, dest_ty)
740 fn fptoui(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
741 // On WebAssembly the `fptoui` and `fptosi` instructions currently have
742 // poor codegen. The reason for this is that the corresponding wasm
743 // instructions, `i32.trunc_f32_s` for example, will trap when the float
744 // is out-of-bounds, infinity, or nan. This means that LLVM
745 // automatically inserts control flow around `fptoui` and `fptosi`
746 // because the LLVM instruction `fptoui` is defined as producing a
747 // poison value, not having UB on out-of-bounds values.
749 // This method, however, is only used with non-saturating casts that
750 // have UB on out-of-bounds values. This means that it's ok if we use
751 // the raw wasm instruction since out-of-bounds values can do whatever
752 // we like. To ensure that LLVM picks the right instruction we choose
753 // the raw wasm intrinsic functions which avoid LLVM inserting all the
754 // other control flow automatically.
755 if self.sess().target.is_like_wasm {
756 let src_ty = self.cx.val_ty(val);
757 if self.cx.type_kind(src_ty) != TypeKind::Vector {
758 let float_width = self.cx.float_width(src_ty);
759 let int_width = self.cx.int_width(dest_ty);
760 let name = match (int_width, float_width) {
761 (32, 32) => Some("llvm.wasm.trunc.unsigned.i32.f32"),
762 (32, 64) => Some("llvm.wasm.trunc.unsigned.i32.f64"),
763 (64, 32) => Some("llvm.wasm.trunc.unsigned.i64.f32"),
764 (64, 64) => Some("llvm.wasm.trunc.unsigned.i64.f64"),
767 if let Some(name) = name {
768 return self.call_intrinsic(name, &[val]);
772 unsafe { llvm::LLVMBuildFPToUI(self.llbuilder, val, dest_ty, UNNAMED) }
775 fn fptosi(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
776 // see `fptoui` above for why wasm is different here
777 if self.sess().target.is_like_wasm {
778 let src_ty = self.cx.val_ty(val);
779 if self.cx.type_kind(src_ty) != TypeKind::Vector {
780 let float_width = self.cx.float_width(src_ty);
781 let int_width = self.cx.int_width(dest_ty);
782 let name = match (int_width, float_width) {
783 (32, 32) => Some("llvm.wasm.trunc.signed.i32.f32"),
784 (32, 64) => Some("llvm.wasm.trunc.signed.i32.f64"),
785 (64, 32) => Some("llvm.wasm.trunc.signed.i64.f32"),
786 (64, 64) => Some("llvm.wasm.trunc.signed.i64.f64"),
789 if let Some(name) = name {
790 return self.call_intrinsic(name, &[val]);
794 unsafe { llvm::LLVMBuildFPToSI(self.llbuilder, val, dest_ty, UNNAMED) }
797 fn uitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
798 unsafe { llvm::LLVMBuildUIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
801 fn sitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
802 unsafe { llvm::LLVMBuildSIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
805 fn fptrunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
806 unsafe { llvm::LLVMBuildFPTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
809 fn fpext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
810 unsafe { llvm::LLVMBuildFPExt(self.llbuilder, val, dest_ty, UNNAMED) }
813 fn ptrtoint(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
814 unsafe { llvm::LLVMBuildPtrToInt(self.llbuilder, val, dest_ty, UNNAMED) }
817 fn inttoptr(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
818 unsafe { llvm::LLVMBuildIntToPtr(self.llbuilder, val, dest_ty, UNNAMED) }
821 fn bitcast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
822 unsafe { llvm::LLVMBuildBitCast(self.llbuilder, val, dest_ty, UNNAMED) }
825 fn intcast(&mut self, val: &'ll Value, dest_ty: &'ll Type, is_signed: bool) -> &'ll Value {
826 unsafe { llvm::LLVMRustBuildIntCast(self.llbuilder, val, dest_ty, is_signed) }
829 fn pointercast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
830 unsafe { llvm::LLVMBuildPointerCast(self.llbuilder, val, dest_ty, UNNAMED) }
834 fn icmp(&mut self, op: IntPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
835 let op = llvm::IntPredicate::from_generic(op);
836 unsafe { llvm::LLVMBuildICmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
839 fn fcmp(&mut self, op: RealPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
840 let op = llvm::RealPredicate::from_generic(op);
841 unsafe { llvm::LLVMBuildFCmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
844 /* Miscellaneous instructions */
854 assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memcpy not supported");
855 let size = self.intcast(size, self.type_isize(), false);
856 let is_volatile = flags.contains(MemFlags::VOLATILE);
857 let dst = self.pointercast(dst, self.type_i8p());
858 let src = self.pointercast(src, self.type_i8p());
860 llvm::LLVMRustBuildMemCpy(
863 dst_align.bytes() as c_uint,
865 src_align.bytes() as c_uint,
881 assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memmove not supported");
882 let size = self.intcast(size, self.type_isize(), false);
883 let is_volatile = flags.contains(MemFlags::VOLATILE);
884 let dst = self.pointercast(dst, self.type_i8p());
885 let src = self.pointercast(src, self.type_i8p());
887 llvm::LLVMRustBuildMemMove(
890 dst_align.bytes() as c_uint,
892 src_align.bytes() as c_uint,
902 fill_byte: &'ll Value,
907 let is_volatile = flags.contains(MemFlags::VOLATILE);
908 let ptr = self.pointercast(ptr, self.type_i8p());
910 llvm::LLVMRustBuildMemSet(
913 align.bytes() as c_uint,
924 then_val: &'ll Value,
925 else_val: &'ll Value,
927 unsafe { llvm::LLVMBuildSelect(self.llbuilder, cond, then_val, else_val, UNNAMED) }
930 fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
931 unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
934 fn extract_element(&mut self, vec: &'ll Value, idx: &'ll Value) -> &'ll Value {
935 unsafe { llvm::LLVMBuildExtractElement(self.llbuilder, vec, idx, UNNAMED) }
938 fn vector_splat(&mut self, num_elts: usize, elt: &'ll Value) -> &'ll Value {
940 let elt_ty = self.cx.val_ty(elt);
941 let undef = llvm::LLVMGetUndef(self.type_vector(elt_ty, num_elts as u64));
942 let vec = self.insert_element(undef, elt, self.cx.const_i32(0));
943 let vec_i32_ty = self.type_vector(self.type_i32(), num_elts as u64);
944 self.shuffle_vector(vec, undef, self.const_null(vec_i32_ty))
948 fn extract_value(&mut self, agg_val: &'ll Value, idx: u64) -> &'ll Value {
949 assert_eq!(idx as c_uint as u64, idx);
950 unsafe { llvm::LLVMBuildExtractValue(self.llbuilder, agg_val, idx as c_uint, UNNAMED) }
953 fn insert_value(&mut self, agg_val: &'ll Value, elt: &'ll Value, idx: u64) -> &'ll Value {
954 assert_eq!(idx as c_uint as u64, idx);
955 unsafe { llvm::LLVMBuildInsertValue(self.llbuilder, agg_val, elt, idx as c_uint, UNNAMED) }
958 fn set_personality_fn(&mut self, personality: &'ll Value) {
960 llvm::LLVMSetPersonalityFn(self.llfn(), personality);
964 fn cleanup_landing_pad(&mut self, ty: &'ll Type, pers_fn: &'ll Value) -> &'ll Value {
965 let landing_pad = self.landing_pad(ty, pers_fn, 1 /* FIXME should this be 0? */);
967 llvm::LLVMSetCleanup(landing_pad, llvm::True);
972 fn resume(&mut self, exn: &'ll Value) {
974 llvm::LLVMBuildResume(self.llbuilder, exn);
978 fn cleanup_pad(&mut self, parent: Option<&'ll Value>, args: &[&'ll Value]) -> Funclet<'ll> {
979 let name = cstr!("cleanuppad");
981 llvm::LLVMRustBuildCleanupPad(
984 args.len() as c_uint,
989 Funclet::new(ret.expect("LLVM does not have support for cleanuppad"))
992 fn cleanup_ret(&mut self, funclet: &Funclet<'ll>, unwind: Option<&'ll BasicBlock>) {
994 llvm::LLVMRustBuildCleanupRet(self.llbuilder, funclet.cleanuppad(), unwind)
995 .expect("LLVM does not have support for cleanupret");
999 fn catch_pad(&mut self, parent: &'ll Value, args: &[&'ll Value]) -> Funclet<'ll> {
1000 let name = cstr!("catchpad");
1002 llvm::LLVMRustBuildCatchPad(
1005 args.len() as c_uint,
1010 Funclet::new(ret.expect("LLVM does not have support for catchpad"))
1015 parent: Option<&'ll Value>,
1016 unwind: Option<&'ll BasicBlock>,
1017 handlers: &[&'ll BasicBlock],
1019 let name = cstr!("catchswitch");
1021 llvm::LLVMRustBuildCatchSwitch(
1025 handlers.len() as c_uint,
1029 let ret = ret.expect("LLVM does not have support for catchswitch");
1030 for handler in handlers {
1032 llvm::LLVMRustAddHandler(ret, handler);
1038 // Atomic Operations
1044 order: rustc_codegen_ssa::common::AtomicOrdering,
1045 failure_order: rustc_codegen_ssa::common::AtomicOrdering,
1048 let weak = if weak { llvm::True } else { llvm::False };
1050 let value = llvm::LLVMBuildAtomicCmpXchg(
1055 AtomicOrdering::from_generic(order),
1056 AtomicOrdering::from_generic(failure_order),
1057 llvm::False, // SingleThreaded
1059 llvm::LLVMSetWeak(value, weak);
1065 op: rustc_codegen_ssa::common::AtomicRmwBinOp,
1068 order: rustc_codegen_ssa::common::AtomicOrdering,
1071 llvm::LLVMBuildAtomicRMW(
1073 AtomicRmwBinOp::from_generic(op),
1076 AtomicOrdering::from_generic(order),
1077 llvm::False, // SingleThreaded
1084 order: rustc_codegen_ssa::common::AtomicOrdering,
1085 scope: SynchronizationScope,
1087 let single_threaded = match scope {
1088 SynchronizationScope::SingleThread => llvm::True,
1089 SynchronizationScope::CrossThread => llvm::False,
1092 llvm::LLVMBuildFence(
1094 AtomicOrdering::from_generic(order),
1101 fn set_invariant_load(&mut self, load: &'ll Value) {
1103 llvm::LLVMSetMetadata(
1105 llvm::MD_invariant_load as c_uint,
1106 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
1111 fn lifetime_start(&mut self, ptr: &'ll Value, size: Size) {
1112 self.call_lifetime_intrinsic("llvm.lifetime.start.p0i8", ptr, size);
1115 fn lifetime_end(&mut self, ptr: &'ll Value, size: Size) {
1116 self.call_lifetime_intrinsic("llvm.lifetime.end.p0i8", ptr, size);
1119 fn instrprof_increment(
1121 fn_name: &'ll Value,
1123 num_counters: &'ll Value,
1127 "instrprof_increment() with args ({:?}, {:?}, {:?}, {:?})",
1128 fn_name, hash, num_counters, index
1131 let llfn = unsafe { llvm::LLVMRustGetInstrProfIncrementIntrinsic(self.cx().llmod) };
1132 let llty = self.cx.type_func(
1133 &[self.cx.type_i8p(), self.cx.type_i64(), self.cx.type_i32(), self.cx.type_i32()],
1134 self.cx.type_void(),
1136 let args = &[fn_name, hash, num_counters, index];
1137 let args = self.check_call("call", llty, llfn, args);
1140 let _ = llvm::LLVMRustBuildCall(
1144 args.as_ptr() as *const &llvm::Value,
1145 args.len() as c_uint,
1154 fn_abi: Option<&FnAbi<'tcx, Ty<'tcx>>>,
1156 args: &[&'ll Value],
1157 funclet: Option<&Funclet<'ll>>,
1159 debug!("call {:?} with args ({:?})", llfn, args);
1161 let args = self.check_call("call", llty, llfn, args);
1162 let bundle = funclet.map(|funclet| funclet.bundle());
1163 let bundle = bundle.as_ref().map(|b| &*b.raw);
1166 llvm::LLVMRustBuildCall(
1170 args.as_ptr() as *const &llvm::Value,
1171 args.len() as c_uint,
1175 if let Some(fn_abi) = fn_abi {
1176 fn_abi.apply_attrs_callsite(self, call);
1181 fn zext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
1182 unsafe { llvm::LLVMBuildZExt(self.llbuilder, val, dest_ty, UNNAMED) }
1185 fn do_not_inline(&mut self, llret: &'ll Value) {
1186 let noinline = llvm::AttributeKind::NoInline.create_attr(self.llcx);
1187 attributes::apply_to_callsite(llret, llvm::AttributePlace::Function, &[noinline]);
1191 impl<'ll> StaticBuilderMethods for Builder<'_, 'll, '_> {
1192 fn get_static(&mut self, def_id: DefId) -> &'ll Value {
1193 // Forward to the `get_static` method of `CodegenCx`
1194 self.cx().get_static(def_id)
1198 impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
1199 fn with_cx(cx: &'a CodegenCx<'ll, 'tcx>) -> Self {
1200 // Create a fresh builder from the crate context.
1201 let llbuilder = unsafe { llvm::LLVMCreateBuilderInContext(cx.llcx) };
1202 Builder { llbuilder, cx }
1205 pub fn llfn(&self) -> &'ll Value {
1206 unsafe { llvm::LLVMGetBasicBlockParent(self.llbb()) }
1209 fn position_at_start(&mut self, llbb: &'ll BasicBlock) {
1211 llvm::LLVMRustPositionBuilderAtStart(self.llbuilder, llbb);
1215 fn align_metadata(&mut self, load: &'ll Value, align: Align) {
1217 let v = [self.cx.const_u64(align.bytes())];
1219 llvm::LLVMSetMetadata(
1221 llvm::MD_align as c_uint,
1222 llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
1227 fn noundef_metadata(&mut self, load: &'ll Value) {
1229 llvm::LLVMSetMetadata(
1231 llvm::MD_noundef as c_uint,
1232 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
1237 pub fn minnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1238 unsafe { llvm::LLVMRustBuildMinNum(self.llbuilder, lhs, rhs) }
1241 pub fn maxnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1242 unsafe { llvm::LLVMRustBuildMaxNum(self.llbuilder, lhs, rhs) }
1245 pub fn insert_element(
1251 unsafe { llvm::LLVMBuildInsertElement(self.llbuilder, vec, elt, idx, UNNAMED) }
1254 pub fn shuffle_vector(
1260 unsafe { llvm::LLVMBuildShuffleVector(self.llbuilder, v1, v2, mask, UNNAMED) }
1263 pub fn vector_reduce_fadd(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1264 unsafe { llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src) }
1266 pub fn vector_reduce_fmul(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1267 unsafe { llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src) }
1269 pub fn vector_reduce_fadd_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1271 let instr = llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src);
1272 llvm::LLVMRustSetFastMath(instr);
1276 pub fn vector_reduce_fmul_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1278 let instr = llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src);
1279 llvm::LLVMRustSetFastMath(instr);
1283 pub fn vector_reduce_add(&mut self, src: &'ll Value) -> &'ll Value {
1284 unsafe { llvm::LLVMRustBuildVectorReduceAdd(self.llbuilder, src) }
1286 pub fn vector_reduce_mul(&mut self, src: &'ll Value) -> &'ll Value {
1287 unsafe { llvm::LLVMRustBuildVectorReduceMul(self.llbuilder, src) }
1289 pub fn vector_reduce_and(&mut self, src: &'ll Value) -> &'ll Value {
1290 unsafe { llvm::LLVMRustBuildVectorReduceAnd(self.llbuilder, src) }
1292 pub fn vector_reduce_or(&mut self, src: &'ll Value) -> &'ll Value {
1293 unsafe { llvm::LLVMRustBuildVectorReduceOr(self.llbuilder, src) }
1295 pub fn vector_reduce_xor(&mut self, src: &'ll Value) -> &'ll Value {
1296 unsafe { llvm::LLVMRustBuildVectorReduceXor(self.llbuilder, src) }
1298 pub fn vector_reduce_fmin(&mut self, src: &'ll Value) -> &'ll Value {
1300 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ false)
1303 pub fn vector_reduce_fmax(&mut self, src: &'ll Value) -> &'ll Value {
1305 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ false)
1308 pub fn vector_reduce_fmin_fast(&mut self, src: &'ll Value) -> &'ll Value {
1311 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ true);
1312 llvm::LLVMRustSetFastMath(instr);
1316 pub fn vector_reduce_fmax_fast(&mut self, src: &'ll Value) -> &'ll Value {
1319 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ true);
1320 llvm::LLVMRustSetFastMath(instr);
1324 pub fn vector_reduce_min(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1325 unsafe { llvm::LLVMRustBuildVectorReduceMin(self.llbuilder, src, is_signed) }
1327 pub fn vector_reduce_max(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1328 unsafe { llvm::LLVMRustBuildVectorReduceMax(self.llbuilder, src, is_signed) }
1331 pub fn add_clause(&mut self, landing_pad: &'ll Value, clause: &'ll Value) {
1333 llvm::LLVMAddClause(landing_pad, clause);
1337 pub fn catch_ret(&mut self, funclet: &Funclet<'ll>, unwind: &'ll BasicBlock) -> &'ll Value {
1339 unsafe { llvm::LLVMRustBuildCatchRet(self.llbuilder, funclet.cleanuppad(), unwind) };
1340 ret.expect("LLVM does not have support for catchret")
1343 fn check_store(&mut self, val: &'ll Value, ptr: &'ll Value) -> &'ll Value {
1344 let dest_ptr_ty = self.cx.val_ty(ptr);
1345 let stored_ty = self.cx.val_ty(val);
1346 let stored_ptr_ty = self.cx.type_ptr_to(stored_ty);
1348 assert_eq!(self.cx.type_kind(dest_ptr_ty), TypeKind::Pointer);
1350 if dest_ptr_ty == stored_ptr_ty {
1354 "type mismatch in store. \
1355 Expected {:?}, got {:?}; inserting bitcast",
1356 dest_ptr_ty, stored_ptr_ty
1358 self.bitcast(ptr, stored_ptr_ty)
1367 args: &'b [&'ll Value],
1368 ) -> Cow<'b, [&'ll Value]> {
1370 self.cx.type_kind(fn_ty) == TypeKind::Function,
1371 "builder::{} not passed a function, but {:?}",
1376 let param_tys = self.cx.func_params_types(fn_ty);
1378 let all_args_match = iter::zip(¶m_tys, args.iter().map(|&v| self.val_ty(v)))
1379 .all(|(expected_ty, actual_ty)| *expected_ty == actual_ty);
1382 return Cow::Borrowed(args);
1385 let casted_args: Vec<_> = iter::zip(param_tys, args)
1387 .map(|(i, (expected_ty, &actual_val))| {
1388 let actual_ty = self.val_ty(actual_val);
1389 if expected_ty != actual_ty {
1391 "type mismatch in function call of {:?}. \
1392 Expected {:?} for param {}, got {:?}; injecting bitcast",
1393 llfn, expected_ty, i, actual_ty
1395 self.bitcast(actual_val, expected_ty)
1402 Cow::Owned(casted_args)
1405 pub fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
1406 unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
1409 pub(crate) fn call_intrinsic(&mut self, intrinsic: &str, args: &[&'ll Value]) -> &'ll Value {
1410 let (ty, f) = self.cx.get_intrinsic(intrinsic);
1411 self.call(ty, None, f, args, None)
1414 fn call_lifetime_intrinsic(&mut self, intrinsic: &str, ptr: &'ll Value, size: Size) {
1415 let size = size.bytes();
1420 if !self.cx().sess().emit_lifetime_markers() {
1424 let ptr = self.pointercast(ptr, self.cx.type_i8p());
1425 self.call_intrinsic(intrinsic, &[self.cx.const_u64(size), ptr]);
1431 vals: &[&'ll Value],
1432 bbs: &[&'ll BasicBlock],
1434 assert_eq!(vals.len(), bbs.len());
1435 let phi = unsafe { llvm::LLVMBuildPhi(self.llbuilder, ty, UNNAMED) };
1437 llvm::LLVMAddIncoming(phi, vals.as_ptr(), bbs.as_ptr(), vals.len() as c_uint);
1442 fn add_incoming_to_phi(&mut self, phi: &'ll Value, val: &'ll Value, bb: &'ll BasicBlock) {
1444 llvm::LLVMAddIncoming(phi, &val, &bb, 1 as c_uint);
1448 fn fptoint_sat(&mut self, signed: bool, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
1449 let src_ty = self.cx.val_ty(val);
1450 let (float_ty, int_ty, vector_length) = if self.cx.type_kind(src_ty) == TypeKind::Vector {
1451 assert_eq!(self.cx.vector_length(src_ty), self.cx.vector_length(dest_ty));
1453 self.cx.element_type(src_ty),
1454 self.cx.element_type(dest_ty),
1455 Some(self.cx.vector_length(src_ty)),
1458 (src_ty, dest_ty, None)
1460 let float_width = self.cx.float_width(float_ty);
1461 let int_width = self.cx.int_width(int_ty);
1463 let instr = if signed { "fptosi" } else { "fptoui" };
1464 let name = if let Some(vector_length) = vector_length {
1466 "llvm.{}.sat.v{}i{}.v{}f{}",
1467 instr, vector_length, int_width, vector_length, float_width
1470 format!("llvm.{}.sat.i{}.f{}", instr, int_width, float_width)
1472 let f = self.declare_cfn(&name, llvm::UnnamedAddr::No, self.type_func(&[src_ty], dest_ty));
1473 self.call(self.type_func(&[src_ty], dest_ty), None, f, &[val], None)
1476 pub(crate) fn landing_pad(
1479 pers_fn: &'ll Value,
1482 // Use LLVMSetPersonalityFn to set the personality. It supports arbitrary Consts while,
1483 // LLVMBuildLandingPad requires the argument to be a Function (as of LLVM 12). The
1484 // personality lives on the parent function anyway.
1485 self.set_personality_fn(pers_fn);
1487 llvm::LLVMBuildLandingPad(self.llbuilder, ty, None, num_clauses as c_uint, UNNAMED)