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https://github.com/c64scene-ar/llvm-6502.git
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c143dd4f63
This
define float @foo(float %x, float %y) nounwind readnone {
entry:
%0 = tail call float @copysignf(float %x, float %y) nounwind readnone
ret float %0
}
Was compiled to:
vmov s0, r1
bic r0, r0, #-2147483648
vmov s1, r0
vcmpe.f32 s0, #0
vmrs apsr_nzcv, fpscr
it lt
vneglt.f32 s1, s1
vmov r0, s1
bx lr
This fails to copy the sign of -0.0f because it's lost during the float to int
conversion. Also, it's sub-optimal when the inputs are in GPR registers.
Now it uses integer and + or operations when it's profitable. And it's correct!
lsrs r1, r1, #31
bfi r0, r1, #31, #1
bx lr
rdar://8984306
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125357 91177308-0d34-0410-b5e6-96231b3b80d8
46 lines
1.1 KiB
LLVM
46 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=armv7-apple-darwin -mcpu=cortex-a8 | FileCheck %s -check-prefix=SOFT
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; RUN: llc < %s -mtriple=armv7-gnueabi -float-abi=hard -mcpu=cortex-a8 | FileCheck %s -check-prefix=HARD
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; rdar://8984306
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define float @test1(float %x, float %y) nounwind {
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entry:
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; SOFT: test1:
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; SOFT: lsr r1, r1, #31
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; SOFT: bfi r0, r1, #31, #1
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; HARD: test1:
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; HARD: vabs.f32 d0, d0
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; HARD: cmp r0, #0
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; HARD: vneglt.f32 s0, s0
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%0 = tail call float @copysignf(float %x, float %y) nounwind
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ret float %0
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}
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define double @test2(double %x, double %y) nounwind {
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entry:
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; SOFT: test2:
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; SOFT: lsr r2, r3, #31
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; SOFT: bfi r1, r2, #31, #1
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; HARD: test2:
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; HARD: vabs.f64 d0, d0
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; HARD: cmp r1, #0
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; HARD: vneglt.f64 d0, d0
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%0 = tail call double @copysign(double %x, double %y) nounwind
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ret double %0
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}
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define double @test3(double %x, double %y, double %z) nounwind {
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entry:
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; SOFT: test3:
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; SOFT: vabs.f64
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; SOFT: cmp {{.*}}, #0
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; SOFT: vneglt.f64
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%0 = fmul double %x, %y
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%1 = tail call double @copysign(double %0, double %z) nounwind
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ret double %1
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}
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declare double @copysign(double, double) nounwind
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declare float @copysignf(float, float) nounwind
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