forked from OSchip/llvm-project
68 lines
1.6 KiB
LLVM
68 lines
1.6 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
|
|
; PR4374
|
|
define float @test1(float %a, float %b) nounwind {
|
|
%t1 = fsub float %a, %b
|
|
%t2 = fsub float -0.000000e+00, %t1
|
|
|
|
; CHECK: %t1 = fsub float %a, %b
|
|
; CHECK-NEXT: %t2 = fsub float -0.000000e+00, %t1
|
|
|
|
ret float %t2
|
|
}
|
|
|
|
; <rdar://problem/7530098>
|
|
define double @test2(double %x, double %y) nounwind {
|
|
%t1 = fadd double %x, %y
|
|
%t2 = fsub double %x, %t1
|
|
|
|
; CHECK: %t1 = fadd double %x, %y
|
|
; CHECK-NEXT: %t2 = fsub double %x, %t1
|
|
|
|
ret double %t2
|
|
}
|
|
|
|
; CHECK-LABEL: @fsub_undef(
|
|
; CHECK: %sub = fsub float %val, undef
|
|
define float @fsub_undef(float %val) {
|
|
bb:
|
|
%sub = fsub float %val, undef
|
|
ret float %sub
|
|
}
|
|
|
|
; XXX - Why doesn't this fold to undef?
|
|
; CHECK-LABEL: @fsub_fast_undef(
|
|
; CHCK: %sub = fsub fast float %val, undef
|
|
define float @fsub_fast_undef(float %val) {
|
|
bb:
|
|
%sub = fsub fast float %val, undef
|
|
ret float %sub
|
|
}
|
|
|
|
; CHECK-LABEL: @fneg_undef(
|
|
; CHECK: ret float fsub (float -0.000000e+00, float undef)
|
|
define float @fneg_undef(float %val) {
|
|
bb:
|
|
%sub = fsub float -0.0, undef
|
|
ret float %sub
|
|
}
|
|
|
|
; CHECK-LABEL: @fneg_fast_undef(
|
|
; CHECK: ret float fsub (float -0.000000e+00, float undef)
|
|
define float @fneg_fast_undef(float %val) {
|
|
bb:
|
|
%sub = fsub fast float -0.0, undef
|
|
ret float %sub
|
|
}
|
|
|
|
; This folds to a constant expression, which produced 0 instructions
|
|
; contrary to the expected one for negation.
|
|
; CHECK-LABEL: @inconsistent_numbers_fsub_undef(
|
|
; CHECK: ret float fsub (float -0.000000e+00, float undef)
|
|
define float @inconsistent_numbers_fsub_undef(float %val) {
|
|
bb:
|
|
%sub0 = fsub fast float %val, undef
|
|
%sub1 = fsub fast float %sub0, %val
|
|
ret float %sub1
|
|
}
|