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[InstCombine] add tests for fdiv with negated operand; NFC 

llvm-svn: 367145
This commit is contained in:
Sanjay Patel 2019-07-26 19:44:53 +00:00
parent f184ce53a7
commit 487e957775
1 changed files with 35 additions and 0 deletions
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35
llvm/test/Transforms/InstCombine/fdiv.ll
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@ -499,3 +499,38 @@ define <2 x float> @div_constant_dividend3(<2 x float> %x) {
ret <2 x float> %t2
}
define double @fdiv_fneg1(double %x, double %y) {
; CHECK-LABEL: @fdiv_fneg1(
; CHECK-NEXT: [[NEG:%.*]] = fsub double -0.000000e+00, [[X:%.*]]
; CHECK-NEXT: [[DIV:%.*]] = fdiv double [[NEG]], [[Y:%.*]]
; CHECK-NEXT: ret double [[DIV]]
;
%neg = fsub double -0.0, %x
%div = fdiv double %neg, %y
ret double %div
}
define <2 x float> @fdiv_fneg2(<2 x float> %x, <2 x float> %y) {
; CHECK-LABEL: @fdiv_fneg2(
; CHECK-NEXT: [[NEG:%.*]] = fsub <2 x float> <float -0.000000e+00, float -0.000000e+00>, [[X:%.*]]
; CHECK-NEXT: [[DIV:%.*]] = fdiv <2 x float> [[Y:%.*]], [[NEG]]
; CHECK-NEXT: ret <2 x float> [[DIV]]
;
%neg = fsub <2 x float> <float -0.0, float -0.0>, %x
%div = fdiv <2 x float> %y, %neg
ret <2 x float> %div
}
define float @fdiv_fneg1_extra_use(float %x, float %y) {
; CHECK-LABEL: @fdiv_fneg1_extra_use(
; CHECK-NEXT: [[NEG:%.*]] = fsub float -0.000000e+00, [[X:%.*]]
; CHECK-NEXT: call void @use_f32(float [[NEG]])
; CHECK-NEXT: [[DIV:%.*]] = fdiv float [[NEG]], [[Y:%.*]]
; CHECK-NEXT: ret float [[DIV]]
;
%neg = fsub float -0.0, %x
call void @use_f32(float %neg)
%div = fdiv float %neg, %y
ret float %div
}