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[InstCombine] add tests for fsub --> fadd; NFC 

llvm-svn: 329313
This commit is contained in:
Sanjay Patel 2018-04-05 16:51:09 +00:00
parent 16a130bc78
commit 7becb3ae4b
1 changed files with 65 additions and 3 deletions
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68
llvm/test/Transforms/InstCombine/fsub.ll
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@ -3,20 +3,20 @@
; PR4374
define float @test1(float %a, float %b) nounwind {
define float @test1(float %a, float %b) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: [[T1:%.*]] = fsub float [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: [[T2:%.*]] = fsub float -0.000000e+00, [[T1]]
; CHECK-NEXT: ret float [[T2]]
;
%t1 = fsub float %a, %b
%t2 = fsub float -0.000000e+00, %t1
%t2 = fsub float -0.0, %t1
ret float %t2
}
; <rdar://problem/7530098>
define double @test2(double %x, double %y) nounwind {
define double @test2(double %x, double %y) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: [[T1:%.*]] = fadd double [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[T2:%.*]] = fsub double [[X]], [[T1]]
@ -27,3 +27,65 @@ define double @test2(double %x, double %y) nounwind {
ret double %t2
}
; X - C --> X + (-C)
define float @constant_op1(float %x, float %y) {
; CHECK-LABEL: @constant_op1(
; CHECK-NEXT: [[R:%.*]] = fadd float [[X:%.*]], -4.200000e+01
; CHECK-NEXT: ret float [[R]]
;
%r = fsub float %x, 42.0
ret float %r
}
define <2 x float> @constant_op1_vec(<2 x float> %x, <2 x float> %y) {
; CHECK-LABEL: @constant_op1_vec(
; CHECK-NEXT: [[R:%.*]] = fadd <2 x float> [[X:%.*]], <float -4.200000e+01, float 4.200000e+01>
; CHECK-NEXT: ret <2 x float> [[R]]
;
%r = fsub <2 x float> %x, <float 42.0, float -42.0>
ret <2 x float> %r
}
define <2 x float> @constant_op1_vec_undef(<2 x float> %x, <2 x float> %y) {
; CHECK-LABEL: @constant_op1_vec_undef(
; CHECK-NEXT: [[R:%.*]] = fsub <2 x float> [[X:%.*]], <float undef, float -4.200000e+01>
; CHECK-NEXT: ret <2 x float> [[R]]
;
%r = fsub <2 x float> %x, <float undef, float -42.0>
ret <2 x float> %r
}
; X - (-Y) --> X + Y
define float @neg_op1(float %x, float %y) {
; CHECK-LABEL: @neg_op1(
; CHECK-NEXT: [[R:%.*]] = fadd float [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret float [[R]]
;
%negy = fsub float -0.0, %y
%r = fsub float %x, %negy
ret float %r
}
define <2 x float> @neg_op1_vec(<2 x float> %x, <2 x float> %y) {
; CHECK-LABEL: @neg_op1_vec(
; CHECK-NEXT: [[R:%.*]] = fadd <2 x float> [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret <2 x float> [[R]]
;
%negy = fsub <2 x float> <float -0.0, float -0.0>, %y
%r = fsub <2 x float> %x, %negy
ret <2 x float> %r
}
define <2 x float> @neg_op1_vec_undef(<2 x float> %x, <2 x float> %y) {
; CHECK-LABEL: @neg_op1_vec_undef(
; CHECK-NEXT: [[NEGY:%.*]] = fsub <2 x float> <float -0.000000e+00, float undef>, [[Y:%.*]]
; CHECK-NEXT: [[R:%.*]] = fsub <2 x float> [[X:%.*]], [[NEGY]]
; CHECK-NEXT: ret <2 x float> [[R]]
;
%negy = fsub <2 x float> <float -0.0, float undef>, %y
%r = fsub <2 x float> %x, %negy
ret <2 x float> %r
}