// If we are propagating an equality like "(A == B)" == "true" then also
// propagate the equality A == B. When propagating a comparison such as
// "(A >= B)" == "true", replace all instances of "A < B" with "false".
- if (ICmpInst *Cmp = dyn_cast<ICmpInst>(LHS)) {
+ if (CmpInst *Cmp = dyn_cast<CmpInst>(LHS)) {
Value *Op0 = Cmp->getOperand(0), *Op1 = Cmp->getOperand(1);
// If "A == B" is known true, or "A != B" is known false, then replace
(isKnownFalse && Cmp->getPredicate() == CmpInst::ICMP_NE))
Worklist.push_back(std::make_pair(Op0, Op1));
+ // Handle the floating point versions of equality comparisons too.
+ if ((isKnownTrue && Cmp->getPredicate() == CmpInst::FCMP_OEQ) ||
+ (isKnownFalse && Cmp->getPredicate() == CmpInst::FCMP_UNE))
+ Worklist.push_back(std::make_pair(Op0, Op1));
+
// If "A >= B" is known true, replace "A < B" with false everywhere.
CmpInst::Predicate NotPred = Cmp->getInversePredicate();
Constant *NotVal = ConstantInt::get(Cmp->getType(), isKnownFalse);
ret i1 %cmp3
}
+; CHECK-LABEL: @test6_fp(
+define i1 @test6_fp(float %x, float %y) {
+ %cmp2 = fcmp une float %x, %y
+ %cmp = fcmp oeq float %x, %y
+ %cmp3 = fcmp oeq float %x, %y
+ br i1 %cmp, label %same, label %different
+
+same:
+; CHECK: ret i1 false
+ ret i1 %cmp2
+
+different:
+; CHECK: ret i1 false
+ ret i1 %cmp3
+}
+
; CHECK-LABEL: @test7(
define i1 @test7(i32 %x, i32 %y) {
%cmp = icmp sgt i32 %x, %y
ret i1 %cmp3
}
+; CHECK-LABEL: @test7_fp(
+define i1 @test7_fp(float %x, float %y) {
+ %cmp = fcmp ogt float %x, %y
+ br i1 %cmp, label %same, label %different
+
+same:
+ %cmp2 = fcmp ule float %x, %y
+; CHECK: ret i1 false
+ ret i1 %cmp2
+
+different:
+ %cmp3 = fcmp ogt float %x, %y
+; CHECK: ret i1 false
+ ret i1 %cmp3
+}
+
; CHECK-LABEL: @test8(
define i1 @test8(i32 %x, i32 %y) {
%cmp2 = icmp sle i32 %x, %y
ret i1 %cmp3
}
+; CHECK-LABEL: @test8_fp(
+define i1 @test8_fp(float %x, float %y) {
+ %cmp2 = fcmp ule float %x, %y
+ %cmp = fcmp ogt float %x, %y
+ %cmp3 = fcmp ogt float %x, %y
+ br i1 %cmp, label %same, label %different
+
+same:
+; CHECK: ret i1 false
+ ret i1 %cmp2
+
+different:
+; CHECK: ret i1 false
+ ret i1 %cmp3
+}
+
; PR1768
; CHECK-LABEL: @test9(
define i32 @test9(i32 %i, i32 %j) {
; CHECK: call void @g(i1 %y)
ret void
}
+
+define double @fcmp_oeq(double %x, double %y) {
+entry:
+ %cmp = fcmp oeq double %y, 2.0
+ br i1 %cmp, label %if, label %return
+
+if:
+ %div = fdiv double %x, %y
+ br label %return
+
+return:
+ %retval.0 = phi double [ %div, %if ], [ %x, %entry ]
+ ret double %retval.0
+
+; CHECK-LABEL: define double @fcmp_oeq(
+; CHECK: %div = fdiv double %x, 2.000000e+00
+}
+
+define double @fcmp_une(double %x, double %y) {
+entry:
+ %cmp = fcmp une double %y, 2.0
+ br i1 %cmp, label %return, label %else
+
+else:
+ %div = fdiv double %x, %y
+ br label %return
+
+return:
+ %retval.0 = phi double [ %div, %else ], [ %x, %entry ]
+ ret double %retval.0
+
+; CHECK-LABEL: define double @fcmp_une(
+; CHECK: %div = fdiv double %x, 2.000000e+00
+}
+