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3382a84074
NEON is not IEEE 754 compliant, so we should avoid lowering single-precision floating point operations with NEON unless unsafe-math is turned on. The equivalent VFP instructions are IEEE 754 compliant, but in some cores they're much slower, so some archs/OSs might still request it to be on by default, such as Swift and Darwin. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177651 91177308-0d34-0410-b5e6-96231b3b80d8
16 lines
494 B
LLVM
16 lines
494 B
LLVM
; RUN: llc < %s -march=arm -mattr=+vfp2 | FileCheck %s -check-prefix=VFP2
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; RUN: llc < %s -march=arm -mcpu=cortex-a8 --enable-unsafe-fp-math | FileCheck %s -check-prefix=NFP1U
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; RUN: llc < %s -march=arm -mcpu=cortex-a8 | FileCheck %s -check-prefix=NFP1
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; RUN: llc < %s -march=arm -mattr=+neon | FileCheck %s -check-prefix=NFP0
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define float @test(float %a, float %b) {
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entry:
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%0 = fsub float %a, %b
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ret float %0
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}
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; VFP2: vsub.f32 s
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; NFP1U: vsub.f32 d
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; NFP1: vsub.f32 s
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; NFP0: vsub.f32 s
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