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ed05086d61
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
79 lines
2.7 KiB
LLVM
79 lines
2.7 KiB
LLVM
; RUN: llc < %s -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -mattr=-f16c | FileCheck %s -check-prefix=CHECK -check-prefix=LIBCALL
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; RUN: llc < %s -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -mattr=+f16c | FileCheck %s -check-prefix=CHECK -check-prefix=F16C
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; RUN: llc < %s -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -soft-float=1 -mattr=-f16c | FileCheck %s -check-prefix=CHECK -check-prefix=SOFTFLOAT
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; RUN: llc < %s -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -soft-float=1 -mattr=+f16c | FileCheck %s -check-prefix=CHECK -check-prefix=SOFTFLOAT
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; This is a test for float to half float conversions on x86-64.
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;
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; If flag -soft-float is set, or if there is no F16C support, then:
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; 1) half float to float conversions are
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; translated into calls to __gnu_h2f_ieee defined
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; by the compiler runtime library;
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; 2) float to half float conversions are translated into calls
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; to __gnu_f2h_ieee which expected to be defined by the
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; compiler runtime library.
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;
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; Otherwise (we have F16C support):
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; 1) half float to float conversion are translated using
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; vcvtph2ps instructions;
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; 2) float to half float conversions are translated using
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; vcvtps2ph instructions
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define void @test1(float %src, i16* %dest) {
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%1 = tail call i16 @llvm.convert.to.fp16.f32(float %src)
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store i16 %1, i16* %dest, align 2
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ret void
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}
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; CHECK-LABEL: test1
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; LIBCALL: callq __gnu_f2h_ieee
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; SOFTFLOAT: callq __gnu_f2h_ieee
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; F16C: vcvtps2ph
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; CHECK: ret
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define float @test2(i16* nocapture %src) {
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%1 = load i16* %src, align 2
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%2 = tail call float @llvm.convert.from.fp16.f32(i16 %1)
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ret float %2
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}
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; CHECK-LABEL: test2:
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; LIBCALL: jmp __gnu_h2f_ieee
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; SOFTFLOAT: callq __gnu_h2f_ieee
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; F16C: vcvtph2ps
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; F16C: ret
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define float @test3(float %src) nounwind uwtable readnone {
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%1 = tail call i16 @llvm.convert.to.fp16.f32(float %src)
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%2 = tail call float @llvm.convert.from.fp16.f32(i16 %1)
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ret float %2
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}
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; CHECK-LABEL: test3:
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; LIBCALL: callq __gnu_f2h_ieee
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; LIBCALL: jmp __gnu_h2f_ieee
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; SOFTFLOAT: callq __gnu_f2h_ieee
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; SOFTFLOAT: callq __gnu_h2f_ieee
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; F16C: vcvtps2ph
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; F16C-NEXT: vcvtph2ps
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; F16C: ret
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define double @test4(i16* nocapture %src) {
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%1 = load i16* %src, align 2
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%2 = tail call double @llvm.convert.from.fp16.f64(i16 %1)
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ret double %2
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}
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; CHECK-LABEL: test4:
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; LIBCALL: callq __gnu_h2f_ieee
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; LIBCALL: cvtss2sd
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; SOFTFLOAT: callq __gnu_h2f_ieee
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; SOFTFLOAT: callq __extendsfdf2
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; F16C: vcvtph2ps
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; F16C: vcvtss2sd
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; F16C: ret
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declare float @llvm.convert.from.fp16.f32(i16) nounwind readnone
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declare i16 @llvm.convert.to.fp16.f32(float) nounwind readnone
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declare double @llvm.convert.from.fp16.f64(i16) nounwind readnone
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