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[InstCombine] add tests for fmin/fmax pattern matching failure; NFC 

llvm-svn: 345771
This commit is contained in:
Sanjay Patel 2018-10-31 20:03:27 +00:00
parent 92bb783cfe
commit b041831a1a
1 changed files with 44 additions and 2 deletions
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46
llvm/test/Transforms/InstCombine/minmax-fp.ll
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@ -57,7 +57,10 @@ define double @t5(float %a) {
ret double %3
}
; Signed zero, should not be converted
; TODO:
; From IEEE754: "Comparisons shall ignore the sign of zero (so +0 = −0)."
; So the compare constant may be treated as +0.0, and we sink the fpext.
define double @t6(float %a) {
; CHECK-LABEL: @t6(
; CHECK-NEXT: [[TMP1:%.*]] = fcmp ult float [[A:%.*]], -0.000000e+00
@ -71,7 +74,10 @@ define double @t6(float %a) {
ret double %3
}
; Signed zero, should not be converted
; TODO:
; From IEEE754: "Comparisons shall ignore the sign of zero (so +0 = −0)."
; So the compare constant may be treated as -0.0, and we sink the fpext.
define double @t7(float %a) {
; CHECK-LABEL: @t7(
; CHECK-NEXT: [[TMP1:%.*]] = fcmp ult float [[A:%.*]], 0.000000e+00
@ -85,6 +91,42 @@ define double @t7(float %a) {
ret double %3
}
; TODO:
; min(min(x, 0.0), 0.0) --> min(x, 0.0)
define float @fmin_fmin_zero_mismatch(float %x) {
; CHECK-LABEL: @fmin_fmin_zero_mismatch(
; CHECK-NEXT: [[CMP1:%.*]] = fcmp olt float [[X:%.*]], -0.000000e+00
; CHECK-NEXT: [[MIN1:%.*]] = select i1 [[CMP1]], float [[X]], float 0.000000e+00
; CHECK-NEXT: [[CMP2:%.*]] = fcmp olt float [[MIN1]], 0.000000e+00
; CHECK-NEXT: [[MIN2:%.*]] = select i1 [[CMP2]], float [[MIN1]], float 0.000000e+00
; CHECK-NEXT: ret float [[MIN2]]
;
%cmp1 = fcmp olt float %x, -0.0
%min1 = select i1 %cmp1, float %x, float 0.0
%cmp2 = fcmp olt float %min1, 0.0
%min2 = select i1 %cmp2, float %min1, float 0.0
ret float %min2
}
; TODO:
; max(max(x, -0.0), -0.0) --> max(x, -0.0)
define float @fmax_fmax_zero_mismatch(float %x) {
; CHECK-LABEL: @fmax_fmax_zero_mismatch(
; CHECK-NEXT: [[CMP1:%.*]] = fcmp ogt float [[X:%.*]], 0.000000e+00
; CHECK-NEXT: [[MAX1:%.*]] = select i1 [[CMP1]], float [[X]], float -0.000000e+00
; CHECK-NEXT: [[CMP2:%.*]] = fcmp olt float [[MAX1]], 0.000000e+00
; CHECK-NEXT: [[MAX2:%.*]] = select i1 [[CMP2]], float -0.000000e+00, float [[MAX1]]
; CHECK-NEXT: ret float [[MAX2]]
;
%cmp1 = fcmp ogt float %x, 0.0
%max1 = select i1 %cmp1, float %x, float -0.0
%cmp2 = fcmp ogt float 0.0, %max1
%max2 = select i1 %cmp2, float -0.0, float %max1
ret float %max2
}
define i64 @t8(float %a) {
; CHECK-LABEL: @t8(
; CHECK-NEXT: [[DOTINV:%.*]] = fcmp oge float [[A:%.*]], 5.000000e+00