1 //! Various operations on integer and floating-point numbers
5 pub(crate) fn bin_op_to_intcc(bin_op: BinOp, signed: bool) -> Option<IntCC> {
21 UnsignedLessThanOrEqual
27 SignedGreaterThanOrEqual
29 UnsignedGreaterThanOrEqual
43 fn codegen_compare_bin_op<'tcx>(
44 fx: &mut FunctionCx<'_, '_, 'tcx>,
50 let intcc = crate::num::bin_op_to_intcc(bin_op, signed).unwrap();
51 let val = fx.bcx.ins().icmp(intcc, lhs, rhs);
52 let val = fx.bcx.ins().bint(types::I8, val);
53 CValue::by_val(val, fx.layout_of(fx.tcx.types.bool))
56 pub(crate) fn codegen_binop<'tcx>(
57 fx: &mut FunctionCx<'_, '_, 'tcx>,
63 BinOp::Eq | BinOp::Lt | BinOp::Le | BinOp::Ne | BinOp::Ge | BinOp::Gt => {
64 match in_lhs.layout().ty.kind() {
65 ty::Bool | ty::Uint(_) | ty::Int(_) | ty::Char => {
66 let signed = type_sign(in_lhs.layout().ty);
67 let lhs = in_lhs.load_scalar(fx);
68 let rhs = in_rhs.load_scalar(fx);
70 return codegen_compare_bin_op(fx, bin_op, signed, lhs, rhs);
78 match in_lhs.layout().ty.kind() {
79 ty::Bool => crate::num::codegen_bool_binop(fx, bin_op, in_lhs, in_rhs),
80 ty::Uint(_) | ty::Int(_) => crate::num::codegen_int_binop(fx, bin_op, in_lhs, in_rhs),
81 ty::Float(_) => crate::num::codegen_float_binop(fx, bin_op, in_lhs, in_rhs),
82 ty::RawPtr(..) | ty::FnPtr(..) => crate::num::codegen_ptr_binop(fx, bin_op, in_lhs, in_rhs),
83 _ => unreachable!("{:?}({:?}, {:?})", bin_op, in_lhs.layout().ty, in_rhs.layout().ty),
87 pub(crate) fn codegen_bool_binop<'tcx>(
88 fx: &mut FunctionCx<'_, '_, 'tcx>,
93 let lhs = in_lhs.load_scalar(fx);
94 let rhs = in_rhs.load_scalar(fx);
97 let res = match bin_op {
98 BinOp::BitXor => b.bxor(lhs, rhs),
99 BinOp::BitAnd => b.band(lhs, rhs),
100 BinOp::BitOr => b.bor(lhs, rhs),
101 // Compare binops handles by `codegen_binop`.
102 _ => unreachable!("{:?}({:?}, {:?})", bin_op, in_lhs, in_rhs),
105 CValue::by_val(res, fx.layout_of(fx.tcx.types.bool))
108 pub(crate) fn codegen_int_binop<'tcx>(
109 fx: &mut FunctionCx<'_, '_, 'tcx>,
111 in_lhs: CValue<'tcx>,
112 in_rhs: CValue<'tcx>,
114 if bin_op != BinOp::Shl && bin_op != BinOp::Shr {
118 "int binop requires lhs and rhs of same type"
122 if let Some(res) = crate::codegen_i128::maybe_codegen(fx, bin_op, false, in_lhs, in_rhs) {
126 let signed = type_sign(in_lhs.layout().ty);
128 let lhs = in_lhs.load_scalar(fx);
129 let rhs = in_rhs.load_scalar(fx);
131 let b = fx.bcx.ins();
132 let val = match bin_op {
133 BinOp::Add => b.iadd(lhs, rhs),
134 BinOp::Sub => b.isub(lhs, rhs),
135 BinOp::Mul => b.imul(lhs, rhs),
150 BinOp::BitXor => b.bxor(lhs, rhs),
151 BinOp::BitAnd => b.band(lhs, rhs),
152 BinOp::BitOr => b.bor(lhs, rhs),
154 let lhs_ty = fx.bcx.func.dfg.value_type(lhs);
155 let actual_shift = fx.bcx.ins().band_imm(rhs, i64::from(lhs_ty.bits() - 1));
156 fx.bcx.ins().ishl(lhs, actual_shift)
159 let lhs_ty = fx.bcx.func.dfg.value_type(lhs);
160 let actual_shift = fx.bcx.ins().band_imm(rhs, i64::from(lhs_ty.bits() - 1));
162 fx.bcx.ins().sshr(lhs, actual_shift)
164 fx.bcx.ins().ushr(lhs, actual_shift)
167 // Compare binops handles by `codegen_binop`.
168 _ => unreachable!("{:?}({:?}, {:?})", bin_op, in_lhs.layout().ty, in_rhs.layout().ty),
171 CValue::by_val(val, in_lhs.layout())
174 pub(crate) fn codegen_checked_int_binop<'tcx>(
175 fx: &mut FunctionCx<'_, '_, 'tcx>,
177 in_lhs: CValue<'tcx>,
178 in_rhs: CValue<'tcx>,
180 if bin_op != BinOp::Shl && bin_op != BinOp::Shr {
184 "checked int binop requires lhs and rhs of same type"
188 let lhs = in_lhs.load_scalar(fx);
189 let rhs = in_rhs.load_scalar(fx);
191 if let Some(res) = crate::codegen_i128::maybe_codegen(fx, bin_op, true, in_lhs, in_rhs) {
195 let signed = type_sign(in_lhs.layout().ty);
197 let (res, has_overflow) = match bin_op {
199 /*let (val, c_out) = fx.bcx.ins().iadd_cout(lhs, rhs);
201 // FIXME(CraneStation/cranelift#849) legalize iadd_cout for i8 and i16
202 let val = fx.bcx.ins().iadd(lhs, rhs);
203 let has_overflow = if !signed {
204 fx.bcx.ins().icmp(IntCC::UnsignedLessThan, val, lhs)
206 let rhs_is_negative = fx.bcx.ins().icmp_imm(IntCC::SignedLessThan, rhs, 0);
207 let slt = fx.bcx.ins().icmp(IntCC::SignedLessThan, val, lhs);
208 fx.bcx.ins().bxor(rhs_is_negative, slt)
213 /*let (val, b_out) = fx.bcx.ins().isub_bout(lhs, rhs);
215 // FIXME(CraneStation/cranelift#849) legalize isub_bout for i8 and i16
216 let val = fx.bcx.ins().isub(lhs, rhs);
217 let has_overflow = if !signed {
218 fx.bcx.ins().icmp(IntCC::UnsignedGreaterThan, val, lhs)
220 let rhs_is_negative = fx.bcx.ins().icmp_imm(IntCC::SignedLessThan, rhs, 0);
221 let sgt = fx.bcx.ins().icmp(IntCC::SignedGreaterThan, val, lhs);
222 fx.bcx.ins().bxor(rhs_is_negative, sgt)
227 let ty = fx.bcx.func.dfg.value_type(lhs);
229 types::I8 | types::I16 | types::I32 if !signed => {
230 let lhs = fx.bcx.ins().uextend(ty.double_width().unwrap(), lhs);
231 let rhs = fx.bcx.ins().uextend(ty.double_width().unwrap(), rhs);
232 let val = fx.bcx.ins().imul(lhs, rhs);
233 let has_overflow = fx.bcx.ins().icmp_imm(
234 IntCC::UnsignedGreaterThan,
236 (1 << ty.bits()) - 1,
238 let val = fx.bcx.ins().ireduce(ty, val);
241 types::I8 | types::I16 | types::I32 if signed => {
242 let lhs = fx.bcx.ins().sextend(ty.double_width().unwrap(), lhs);
243 let rhs = fx.bcx.ins().sextend(ty.double_width().unwrap(), rhs);
244 let val = fx.bcx.ins().imul(lhs, rhs);
246 fx.bcx.ins().icmp_imm(IntCC::SignedLessThan, val, -(1 << (ty.bits() - 1)));
247 let has_overflow = fx.bcx.ins().icmp_imm(
248 IntCC::SignedGreaterThan,
250 (1 << (ty.bits() - 1)) - 1,
252 let val = fx.bcx.ins().ireduce(ty, val);
253 (val, fx.bcx.ins().bor(has_underflow, has_overflow))
256 let val = fx.bcx.ins().imul(lhs, rhs);
257 let has_overflow = if !signed {
258 let val_hi = fx.bcx.ins().umulhi(lhs, rhs);
259 fx.bcx.ins().icmp_imm(IntCC::NotEqual, val_hi, 0)
261 // Based on LLVM's instruction sequence for compiling
262 // a.checked_mul(b).is_some() to riscv64gc:
268 let val_hi = fx.bcx.ins().smulhi(lhs, rhs);
269 let val_sign = fx.bcx.ins().sshr_imm(val, i64::from(ty.bits() - 1));
270 let xor = fx.bcx.ins().bxor(val_hi, val_sign);
271 fx.bcx.ins().icmp_imm(IntCC::NotEqual, xor, 0)
276 unreachable!("i128 should have been handled by codegen_i128::maybe_codegen")
278 _ => unreachable!("invalid non-integer type {}", ty),
282 let lhs_ty = fx.bcx.func.dfg.value_type(lhs);
283 let masked_shift = fx.bcx.ins().band_imm(rhs, i64::from(lhs_ty.bits() - 1));
284 let val = fx.bcx.ins().ishl(lhs, masked_shift);
285 let ty = fx.bcx.func.dfg.value_type(val);
286 let max_shift = i64::from(ty.bits()) - 1;
287 let has_overflow = fx.bcx.ins().icmp_imm(IntCC::UnsignedGreaterThan, rhs, max_shift);
291 let lhs_ty = fx.bcx.func.dfg.value_type(lhs);
292 let masked_shift = fx.bcx.ins().band_imm(rhs, i64::from(lhs_ty.bits() - 1));
293 let val = if !signed {
294 fx.bcx.ins().ushr(lhs, masked_shift)
296 fx.bcx.ins().sshr(lhs, masked_shift)
298 let ty = fx.bcx.func.dfg.value_type(val);
299 let max_shift = i64::from(ty.bits()) - 1;
300 let has_overflow = fx.bcx.ins().icmp_imm(IntCC::UnsignedGreaterThan, rhs, max_shift);
303 _ => bug!("binop {:?} on checked int/uint lhs: {:?} rhs: {:?}", bin_op, in_lhs, in_rhs),
306 let has_overflow = fx.bcx.ins().bint(types::I8, has_overflow);
308 let out_layout = fx.layout_of(fx.tcx.mk_tup([in_lhs.layout().ty, fx.tcx.types.bool].iter()));
309 CValue::by_val_pair(res, has_overflow, out_layout)
312 pub(crate) fn codegen_float_binop<'tcx>(
313 fx: &mut FunctionCx<'_, '_, 'tcx>,
315 in_lhs: CValue<'tcx>,
316 in_rhs: CValue<'tcx>,
318 assert_eq!(in_lhs.layout().ty, in_rhs.layout().ty);
320 let lhs = in_lhs.load_scalar(fx);
321 let rhs = in_rhs.load_scalar(fx);
323 let b = fx.bcx.ins();
324 let res = match bin_op {
325 BinOp::Add => b.fadd(lhs, rhs),
326 BinOp::Sub => b.fsub(lhs, rhs),
327 BinOp::Mul => b.fmul(lhs, rhs),
328 BinOp::Div => b.fdiv(lhs, rhs),
330 let name = match in_lhs.layout().ty.kind() {
331 ty::Float(FloatTy::F32) => "fmodf",
332 ty::Float(FloatTy::F64) => "fmod",
335 return fx.easy_call(name, &[in_lhs, in_rhs], in_lhs.layout().ty);
337 BinOp::Eq | BinOp::Lt | BinOp::Le | BinOp::Ne | BinOp::Ge | BinOp::Gt => {
338 let fltcc = match bin_op {
339 BinOp::Eq => FloatCC::Equal,
340 BinOp::Lt => FloatCC::LessThan,
341 BinOp::Le => FloatCC::LessThanOrEqual,
342 BinOp::Ne => FloatCC::NotEqual,
343 BinOp::Ge => FloatCC::GreaterThanOrEqual,
344 BinOp::Gt => FloatCC::GreaterThan,
347 let val = fx.bcx.ins().fcmp(fltcc, lhs, rhs);
348 let val = fx.bcx.ins().bint(types::I8, val);
349 return CValue::by_val(val, fx.layout_of(fx.tcx.types.bool));
351 _ => unreachable!("{:?}({:?}, {:?})", bin_op, in_lhs, in_rhs),
354 CValue::by_val(res, in_lhs.layout())
357 pub(crate) fn codegen_ptr_binop<'tcx>(
358 fx: &mut FunctionCx<'_, '_, 'tcx>,
360 in_lhs: CValue<'tcx>,
361 in_rhs: CValue<'tcx>,
363 let is_thin_ptr = in_lhs
367 .map(|TypeAndMut { ty, mutbl: _ }| !has_ptr_meta(fx.tcx, ty))
372 BinOp::Eq | BinOp::Lt | BinOp::Le | BinOp::Ne | BinOp::Ge | BinOp::Gt => {
373 let lhs = in_lhs.load_scalar(fx);
374 let rhs = in_rhs.load_scalar(fx);
376 codegen_compare_bin_op(fx, bin_op, false, lhs, rhs)
379 let pointee_ty = in_lhs.layout().ty.builtin_deref(true).unwrap().ty;
380 let (base, offset) = (in_lhs, in_rhs.load_scalar(fx));
381 let pointee_size = fx.layout_of(pointee_ty).size.bytes();
382 let ptr_diff = fx.bcx.ins().imul_imm(offset, pointee_size as i64);
383 let base_val = base.load_scalar(fx);
384 let res = fx.bcx.ins().iadd(base_val, ptr_diff);
385 CValue::by_val(res, base.layout())
387 _ => unreachable!("{:?}({:?}, {:?})", bin_op, in_lhs, in_rhs),
390 let (lhs_ptr, lhs_extra) = in_lhs.load_scalar_pair(fx);
391 let (rhs_ptr, rhs_extra) = in_rhs.load_scalar_pair(fx);
393 let res = match bin_op {
395 let ptr_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_ptr, rhs_ptr);
396 let extra_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_extra, rhs_extra);
397 fx.bcx.ins().band(ptr_eq, extra_eq)
400 let ptr_ne = fx.bcx.ins().icmp(IntCC::NotEqual, lhs_ptr, rhs_ptr);
401 let extra_ne = fx.bcx.ins().icmp(IntCC::NotEqual, lhs_extra, rhs_extra);
402 fx.bcx.ins().bor(ptr_ne, extra_ne)
404 BinOp::Lt | BinOp::Le | BinOp::Ge | BinOp::Gt => {
405 let ptr_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_ptr, rhs_ptr);
408 fx.bcx.ins().icmp(bin_op_to_intcc(bin_op, false).unwrap(), lhs_ptr, rhs_ptr);
409 let extra_cmp = fx.bcx.ins().icmp(
410 bin_op_to_intcc(bin_op, false).unwrap(),
415 fx.bcx.ins().select(ptr_eq, extra_cmp, ptr_cmp)
417 _ => panic!("bin_op {:?} on ptr", bin_op),
420 CValue::by_val(fx.bcx.ins().bint(types::I8, res), fx.layout_of(fx.tcx.types.bool))