mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-10 06:54:54 +00:00
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
|
|
; RUN: llc < %s -mtriple=armv7-gnueabi -float-abi=hard -mcpu=cortex-a8 | FileCheck %s -check-prefix=HARD
|
|
|
|
; rdar://8984306
|
|
define float @test1(float %x, float %y) nounwind {
|
|
entry:
|
|
; SOFT: test1:
|
|
; SOFT: lsr r1, r1, #31
|
|
; SOFT: bfi r0, r1, #31, #1
|
|
|
|
; HARD: test1:
|
|
; HARD: vabs.f32 d0, d0
|
|
; HARD: cmp r0, #0
|
|
; HARD: vneglt.f32 s0, s0
|
|
%0 = tail call float @copysignf(float %x, float %y) nounwind
|
|
ret float %0
|
|
}
|
|
|
|
define double @test2(double %x, double %y) nounwind {
|
|
entry:
|
|
; SOFT: test2:
|
|
; SOFT: lsr r2, r3, #31
|
|
; SOFT: bfi r1, r2, #31, #1
|
|
|
|
; HARD: test2:
|
|
; HARD: vabs.f64 d0, d0
|
|
; HARD: cmp r1, #0
|
|
; HARD: vneglt.f64 d0, d0
|
|
%0 = tail call double @copysign(double %x, double %y) nounwind
|
|
ret double %0
|
|
}
|
|
|
|
define double @test3(double %x, double %y, double %z) nounwind {
|
|
entry:
|
|
; SOFT: test3:
|
|
; SOFT: vabs.f64
|
|
; SOFT: cmp {{.*}}, #0
|
|
; SOFT: vneglt.f64
|
|
%0 = fmul double %x, %y
|
|
%1 = tail call double @copysign(double %0, double %z) nounwind
|
|
ret double %1
|
|
}
|
|
|
|
declare double @copysign(double, double) nounwind
|
|
declare float @copysignf(float, float) nounwind
|