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https://github.com/c64scene-ar/llvm-6502.git
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d412c608fc
For code like:
float foo(float x) { return copysign(1.0, x); }
We used to generate:
andps <-0.000000e+00,0,0,0>, %xmm0
movss <1.000000e+00>, %xmm1
andps <nan>, %xmm1
orps %xmm0, %xmm1
Basically doing an abs(1.0f) in the two middle instructions.
We now generate:
andps <-0.000000e+00,0,0,0>, %xmm0
orps <1.000000e+00,0,0,0>, %xmm0
Builds on cleanups r223415, r223542.
rdar://19049548
Differential Revision: http://reviews.llvm.org/D6555
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225357 91177308-0d34-0410-b5e6-96231b3b80d8
106 lines
3.3 KiB
LLVM
106 lines
3.3 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.10.0"
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define void @test_copysign_const_magnitude_d(double %X) {
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; CHECK: [[SIGNMASK:L.+]]:
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; CHECK-NEXT: .quad -9223372036854775808 ## double -0.000000e+00
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; CHECK-NEXT: .quad 0 ## double 0.000000e+00
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; CHECK: [[ZERO:L.+]]:
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; CHECK-NEXT: .space 16
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; CHECK: [[ONE:L.+]]:
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; CHECK-NEXT: .quad 4607182418800017408 ## double 1.000000e+00
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; CHECK-NEXT: .quad 0 ## double 0.000000e+00
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; CHECK-LABEL: test_copysign_const_magnitude_d:
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; CHECK: id
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%iX = call double @id_d(double %X)
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; CHECK-NEXT: andpd [[SIGNMASK]](%rip), %xmm0
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%d0 = call double @copysign(double 0.000000e+00, double %iX)
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; CHECK-NEXT: id
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%id0 = call double @id_d(double %d0)
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; CHECK-NEXT: andpd [[SIGNMASK]](%rip), %xmm0
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; CHECK-NEXT: orpd [[ZERO]](%rip), %xmm0
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%dn0 = call double @copysign(double -0.000000e+00, double %id0)
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; CHECK-NEXT: id
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%idn0 = call double @id_d(double %dn0)
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; CHECK-NEXT: andpd [[SIGNMASK]](%rip), %xmm0
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; CHECK-NEXT: orpd [[ONE]](%rip), %xmm0
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%d1 = call double @copysign(double 1.000000e+00, double %idn0)
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; CHECK-NEXT: id
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%id1 = call double @id_d(double %d1)
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; CHECK-NEXT: andpd [[SIGNMASK]](%rip), %xmm0
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; CHECK-NEXT: orpd [[ONE]](%rip), %xmm0
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%dn1 = call double @copysign(double -1.000000e+00, double %id1)
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; CHECK-NEXT: id
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%idn1 = call double @id_d(double %dn1)
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; CHECK: retq
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ret void
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}
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define void @test_copysign_const_magnitude_f(float %X) {
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; CHECK: [[SIGNMASK:L.+]]:
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; CHECK-NEXT: .long 2147483648 ## float -0.000000e+00
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; CHECK-NEXT: .long 0 ## float 0.000000e+00
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; CHECK-NEXT: .long 0 ## float 0.000000e+00
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; CHECK-NEXT: .long 0 ## float 0.000000e+00
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; CHECK: [[ZERO:L.+]]:
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; CHECK-NEXT: .space 16
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; CHECK: [[ONE:L.+]]:
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; CHECK-NEXT: .long 1065353216 ## float 1.000000e+00
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; CHECK-NEXT: .long 0 ## float 0.000000e+00
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; CHECK-NEXT: .long 0 ## float 0.000000e+00
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; CHECK-NEXT: .long 0 ## float 0.000000e+00
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; CHECK-LABEL: test_copysign_const_magnitude_f:
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; CHECK: id
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%iX = call float @id_f(float %X)
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; CHECK-NEXT: andps [[SIGNMASK]](%rip), %xmm0
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%d0 = call float @copysignf(float 0.000000e+00, float %iX)
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; CHECK-NEXT: id
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%id0 = call float @id_f(float %d0)
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; CHECK-NEXT: andps [[SIGNMASK]](%rip), %xmm0
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; CHECK-NEXT: orps [[ZERO]](%rip), %xmm0
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%dn0 = call float @copysignf(float -0.000000e+00, float %id0)
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; CHECK-NEXT: id
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%idn0 = call float @id_f(float %dn0)
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; CHECK-NEXT: andps [[SIGNMASK]](%rip), %xmm0
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; CHECK-NEXT: orps [[ONE]](%rip), %xmm0
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%d1 = call float @copysignf(float 1.000000e+00, float %idn0)
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; CHECK-NEXT: id
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%id1 = call float @id_f(float %d1)
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; CHECK-NEXT: andps [[SIGNMASK]](%rip), %xmm0
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; CHECK-NEXT: orps [[ONE]](%rip), %xmm0
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%dn1 = call float @copysignf(float -1.000000e+00, float %id1)
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; CHECK-NEXT: id
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%idn1 = call float @id_f(float %dn1)
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; CHECK: retq
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ret void
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}
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declare double @copysign(double, double) nounwind readnone
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declare float @copysignf(float, float) nounwind readnone
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; Dummy identity functions, so we always have xmm0, and prevent optimizations.
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declare double @id_d(double)
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declare float @id_f(float)
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