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X86: support double extension of f16 type.

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x86 has no native ability to extend an f16 to f64, but the same result
is obtained if we expand it into two separate extensions: f16 -> f32
-> f64.

Unfortunately the same is not true for truncate, so that still results
in a compilation failure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213251 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2014-07-17 11:04:04 +00:00
parent 3e61ccdded
commit ed05086d61
2 changed files with 19 additions and 1 deletions
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4
lib/Target/X86/X86ISelLowering.cpp
View File

@ -523,6 +523,10 @@ void X86TargetLowering::resetOperationActions() {
setOperationAction(ISD::FP_TO_FP16, MVT::f32, Expand);
}
// There's never any support for extending beyond MVT::f32.
setOperationAction(ISD::FP16_TO_FP, MVT::f64, Expand);
setOperationAction(ISD::FP16_TO_FP, MVT::f80, Expand);
if (Subtarget->hasPOPCNT()) {
setOperationAction(ISD::CTPOP , MVT::i8 , Promote);
} else {

16
test/CodeGen/X86/cvt16.ll
View File

@ -59,6 +59,20 @@ define float @test3(float %src) nounwind uwtable readnone {
; F16C-NEXT: vcvtph2ps
; F16C: ret
define double @test4(i16* nocapture %src) {
%1 = load i16* %src, align 2
%2 = tail call double @llvm.convert.from.fp16.f64(i16 %1)
ret double %2
}
; CHECK-LABEL: test4:
; LIBCALL: callq __gnu_h2f_ieee
; LIBCALL: cvtss2sd
; SOFTFLOAT: callq __gnu_h2f_ieee
; SOFTFLOAT: callq __extendsfdf2
; F16C: vcvtph2ps
; F16C: vcvtss2sd
; F16C: ret
declare float @llvm.convert.from.fp16.f32(i16) nounwind readnone
declare i16 @llvm.convert.to.fp16.f32(float) nounwind readnone
declare double @llvm.convert.from.fp16.f64(i16) nounwind readnone