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StructurizeCFG: Fix inverting constantexpr conditions 

llvm-svn: 275626
This commit is contained in:
Matt Arsenault 2016-07-15 22:13:16 +00:00
parent 408e300933
commit 93be6e8c0a
2 changed files with 32 additions and 8 deletions
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10
llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
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@ -377,14 +377,8 @@ void StructurizeCFG::analyzeLoops(RegionNode *N) {
/// \brief Invert the given condition
Value *StructurizeCFG::invert(Value *Condition) {
// First: Check if it's a constant
if (Condition == BoolTrue)
return BoolFalse;
if (Condition == BoolFalse)
return BoolTrue;
if (Condition == BoolUndef)
return BoolUndef;
if (Constant *C = dyn_cast<Constant>(Condition))
return ConstantExpr::getNot(C);
// Second: If the condition is already inverted, return the original value
if (match(Condition, m_Not(m_Value(Condition))))

30
llvm/test/Transforms/StructurizeCFG/invert-constantexpr.ll Normal file
View File

@ -0,0 +1,30 @@
; RUN: opt -S -o - -structurizecfg < %s | FileCheck %s
; CHECK-LABEL: @invert_constantexpr_condition(
; CHECK: %tmp5 = or i1 %tmp4, icmp eq (i32 bitcast (float fadd (float undef, float undef) to i32), i32 0)
; CHECK: [ icmp ne (i32 bitcast (float fadd (float undef, float undef) to i32), i32 0), %bb ]
define void @invert_constantexpr_condition(i32 %arg, i32 %arg1) #0 {
bb:
%tmp = icmp eq i32 %arg, 0
br i1 icmp eq (i32 bitcast (float fadd (float undef, float undef) to i32), i32 0), label %bb2, label %bb6
bb2:
br i1 %tmp, label %bb3, label %bb6
bb3:
%tmp4 = phi i1 [ %tmp7, %bb6 ], [ undef, %bb2 ]
%tmp5 = or i1 %tmp4, icmp eq (i32 bitcast (float fadd (float undef, float undef) to i32), i32 0)
br i1 %tmp5, label %bb8, label %bb8
bb6:
%tmp7 = icmp slt i32 %arg, %arg1
br label %bb3
bb8:
ret void
}
declare i32 @llvm.amdgcn.workitem.id.x() #1
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }