Commit ad87f244 authored by Sanjay Patel's avatar Sanjay Patel
Browse files

[InstSimplify] add more tests for fcmp+select; NFC 

The easy code fix won't catch non-canonical mismatched
constant patterns, so adding extra coverage for those in
case we decide that's important (but seems unlikely).
parent 82888b78

llvm/test/Transforms/InstSimplify/fcmp-select.ll

+36 −8
Original line number Diff line number Diff line
@@ -126,29 +126,29 @@ define float @oeq_zero_swapped_nsz(float %x) { 
  ret float %cond

}



; X != 0.0 ? X : -0.0 --> X

; X != 0.0 ? X : 0.0 --> X



define double @une_zero_nsz(double %x) {

; CHECK-LABEL: @une_zero_nsz(

; CHECK-NEXT:    [[CMP:%.*]] = fcmp une double [[X:%.*]], 0.000000e+00

; CHECK-NEXT:    [[COND:%.*]] = select ninf nsz i1 [[CMP]], double [[X]], double -0.000000e+00

; CHECK-NEXT:    [[COND:%.*]] = select ninf nsz i1 [[CMP]], double [[X]], double 0.000000e+00

; CHECK-NEXT:    ret double [[COND]]

;

  %cmp = fcmp une double %x, 0.0

  %cond = select nsz ninf i1 %cmp, double %x, double -0.0

  %cond = select nsz ninf i1 %cmp, double %x, double 0.0

  ret double %cond

}



; X != 0.0 ? -0.0 : X --> 0.0

; X != 0.0 ? 0.0 : X --> 0.0



define <2 x double> @une_zero_swapped_nsz(<2 x double> %x) {

; CHECK-LABEL: @une_zero_swapped_nsz(

; CHECK-NEXT:    [[CMP:%.*]] = fcmp une <2 x double> [[X:%.*]], <double -0.000000e+00, double 0.000000e+00>

; CHECK-NEXT:    [[COND:%.*]] = select nsz <2 x i1> [[CMP]], <2 x double> <double 0.000000e+00, double -0.000000e+00>, <2 x double> [[X]]

; CHECK-NEXT:    [[CMP:%.*]] = fcmp une <2 x double> [[X:%.*]], zeroinitializer

; CHECK-NEXT:    [[COND:%.*]] = select nsz <2 x i1> [[CMP]], <2 x double> zeroinitializer, <2 x double> [[X]]

; CHECK-NEXT:    ret <2 x double> [[COND]]

;

  %cmp = fcmp une <2 x double> %x, <double -0.0, double 0.0>

  %cond = select nsz <2 x i1> %cmp, <2 x double> <double 0.0, double -0.0>, <2 x double> %x

  %cmp = fcmp une <2 x double> %x, <double 0.0, double 0.0>

  %cond = select nsz <2 x i1> %cmp, <2 x double> <double 0.0, double 0.0>, <2 x double> %x

  ret <2 x double> %cond

}
@@ -204,6 +204,34 @@ define <2 x double> @une_swapped_nsz(<2 x double> %x, <2 x double> %y) { 
  ret <2 x double> %cond

}



; Harder - mismatched zero constants (not typical due to canonicalization):

; X != 0.0 ? X : -0.0 --> X



define double @une_zero_mismatch_nsz(double %x) {

; CHECK-LABEL: @une_zero_mismatch_nsz(

; CHECK-NEXT:    [[CMP:%.*]] = fcmp une double [[X:%.*]], 0.000000e+00

; CHECK-NEXT:    [[COND:%.*]] = select ninf nsz i1 [[CMP]], double [[X]], double -0.000000e+00

; CHECK-NEXT:    ret double [[COND]]

;

  %cmp = fcmp une double %x, 0.0

  %cond = select nsz ninf i1 %cmp, double %x, double -0.0

  ret double %cond

}



; Even harder - mismatched vector zero constants (not typical due to canonicalization):

; X != 0.0 ? -0.0 : X --> 0.0



define <2 x double> @une_zero_mismatch_swapped_nsz(<2 x double> %x) {

; CHECK-LABEL: @une_zero_mismatch_swapped_nsz(

; CHECK-NEXT:    [[CMP:%.*]] = fcmp une <2 x double> [[X:%.*]], <double -0.000000e+00, double 0.000000e+00>

; CHECK-NEXT:    [[COND:%.*]] = select nsz <2 x i1> [[CMP]], <2 x double> <double 0.000000e+00, double -0.000000e+00>, <2 x double> [[X]]

; CHECK-NEXT:    ret <2 x double> [[COND]]

;

  %cmp = fcmp une <2 x double> %x, <double -0.0, double 0.0>

  %cond = select nsz <2 x i1> %cmp, <2 x double> <double 0.0, double -0.0>, <2 x double> %x

  ret <2 x double> %cond

}



define double @une_could_be_negzero(double %x, double %y) {

; CHECK-LABEL: @une_could_be_negzero(

; CHECK-NEXT:    [[CMP:%.*]] = fcmp une double [[X:%.*]], [[Y:%.*]]