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[X86] Use ZERO_EXTEND instead of SIGN_EXTEND in the fast isel handling of convert_from_fp16.

This commit is contained in:
Craig Topper 2020-02-14 10:37:06 -08:00
parent fc0c72b2df
commit 391cc4dd41
2 changed files with 3 additions and 3 deletions
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4
llvm/lib/Target/X86/X86FastISel.cpp
View File

@ -2648,8 +2648,8 @@ bool X86FastISel::fastLowerIntrinsicCall(const IntrinsicInst *II) {
ResultReg = fastEmitInst_extractsubreg(MVT::i16, ResultReg, true, RegIdx);
} else {
assert(Op->getType()->isIntegerTy(16) && "Expected a 16-bit integer!");
// Explicitly sign-extend the input to 32-bit.
InputReg = fastEmit_r(MVT::i16, MVT::i32, ISD::SIGN_EXTEND, InputReg,
// Explicitly zero-extend the input to 32-bit.
InputReg = fastEmit_r(MVT::i16, MVT::i32, ISD::ZERO_EXTEND, InputReg,
/*Kill=*/false);
// The following SCALAR_TO_VECTOR will be expanded into a VMOVDI2PDIrr.

2
llvm/test/CodeGen/X86/fast-isel-float-half-convertion.ll
View File

@ -15,7 +15,7 @@ entry:
define float @test_fp16_to_fp32(i32 %a) {
; CHECK-LABEL: test_fp16_to_fp32:
; CHECK: movswl %di, %eax
; CHECK: movzwl %di, %eax
; CHECK-NEXT: vmovd %eax, %xmm0
; CHECK-NEXT: vcvtph2ps %xmm0, %xmm0
; CHECK-NEXT: retq