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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
52 lines
1.3 KiB
LLVM
52 lines
1.3 KiB
LLVM
; RUN: llc < %s -march=arm -mattr=+vfp2 | FileCheck %s -check-prefix=VFP2
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; RUN: llc < %s -march=arm -mattr=+neon | 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=NEON
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; RUN: llc < %s -march=arm -mcpu=cortex-a8 | FileCheck %s -check-prefix=VFP2
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; RUN: llc < %s -march=arm -mcpu=cortex-a9 | FileCheck %s -check-prefix=VFP2
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define i32 @test1(float %a, float %b) {
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; VFP2: test1:
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; VFP2: vcvt.s32.f32 s{{.}}, s{{.}}
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; NEON: test1:
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; NEON: vadd.f32 [[D0:d[0-9]+]]
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; NEON: vcvt.s32.f32 d0, [[D0]]
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entry:
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%0 = fadd float %a, %b
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%1 = fptosi float %0 to i32
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ret i32 %1
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}
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define i32 @test2(float %a, float %b) {
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; VFP2: test2:
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; VFP2: vcvt.u32.f32 s{{.}}, s{{.}}
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; NEON: test2:
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; NEON: vadd.f32 [[D0:d[0-9]+]]
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; NEON: vcvt.u32.f32 d0, [[D0]]
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entry:
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%0 = fadd float %a, %b
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%1 = fptoui float %0 to i32
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ret i32 %1
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}
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define float @test3(i32 %a, i32 %b) {
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; VFP2: test3:
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; VFP2: vcvt.f32.u32 s{{.}}, s{{.}}
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; NEON: test3:
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; NEON: vcvt.f32.u32 d
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entry:
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%0 = add i32 %a, %b
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%1 = uitofp i32 %0 to float
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ret float %1
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}
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define float @test4(i32 %a, i32 %b) {
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; VFP2: test4:
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; VFP2: vcvt.f32.s32 s{{.}}, s{{.}}
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; NEON: test4:
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; NEON: vcvt.f32.s32 d
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entry:
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%0 = add i32 %a, %b
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%1 = sitofp i32 %0 to float
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ret float %1
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}
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