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https://github.com/c64scene-ar/llvm-6502.git
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770e106ed6
This patch teaches the backend how to expand a double-half conversion into a double-float conversion immediately followed by a float-half conversion. We do this only under fast-math, and if float-half conversions are legal for the target. Added test CodeGen/X86/fastmath-float-half-conversion.ll Differential Revision: http://reviews.llvm.org/D7832 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230276 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.5 KiB
LLVM
53 lines
1.5 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-unknown -mattr=+f16c < %s | FileCheck %s --check-prefix=ALL --check-prefix=F16C
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; RUN: llc -mtriple=x86_64-unknown-unknown -mattr=+avx < %s | FileCheck %s --check-prefix=ALL --check-prefix=AVX
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define zeroext i16 @test1_fast(double %d) #0 {
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; ALL-LABEL: test1_fast:
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; F16C-NOT: callq {{_+}}truncdfhf2
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; F16C: vcvtsd2ss %xmm0, %xmm0, %xmm0
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; F16C-NEXT: vcvtps2ph $0, %xmm0, %xmm0
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; AVX: callq {{_+}}truncdfhf2
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; ALL: ret
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entry:
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%0 = tail call i16 @llvm.convert.to.fp16.f64(double %d)
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ret i16 %0
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}
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define zeroext i16 @test2_fast(x86_fp80 %d) #0 {
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; ALL-LABEL: test2_fast:
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; F16C-NOT: callq {{_+}}truncxfhf2
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; F16C: fldt
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; F16C-NEXT: fstps
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; F16C-NEXT: vmovss
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; F16C-NEXT: vcvtps2ph $0, %xmm0, %xmm0
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; AVX: callq {{_+}}truncxfhf2
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; ALL: ret
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entry:
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%0 = tail call i16 @llvm.convert.to.fp16.f80(x86_fp80 %d)
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ret i16 %0
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}
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define zeroext i16 @test1(double %d) #1 {
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; ALL-LABEL: test1:
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; ALL: callq {{_+}}truncdfhf2
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; ALL: ret
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entry:
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%0 = tail call i16 @llvm.convert.to.fp16.f64(double %d)
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ret i16 %0
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}
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define zeroext i16 @test2(x86_fp80 %d) #1 {
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; ALL-LABEL: test2:
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; ALL: callq {{_+}}truncxfhf2
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; ALL: ret
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entry:
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%0 = tail call i16 @llvm.convert.to.fp16.f80(x86_fp80 %d)
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ret i16 %0
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}
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declare i16 @llvm.convert.to.fp16.f64(double)
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declare i16 @llvm.convert.to.fp16.f80(x86_fp80)
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attributes #0 = { nounwind readnone uwtable "unsafe-fp-math"="true" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone uwtable "unsafe-fp-math"="false" "use-soft-float"="false" }
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