this case involve a select that simplifies to itself.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121817
91177308-0d34-0410-b5e6-
96231b3b80d8
ConstantInt *CI = dyn_cast<ConstantInt>(C);
if (!CI) return false;
- S->replaceAllUsesWith(S->getOperand(CI->isOne() ? 1 : 2));
+ Value *ReplaceWith = S->getOperand(1);
+ Value *Other = S->getOperand(2);
+ if (!CI->isOne()) std::swap(ReplaceWith, Other);
+ if (ReplaceWith == S) ReplaceWith = UndefValue::get(S->getType());
+
+ S->replaceAllUsesWith(ReplaceWith);
S->eraseFromParent();
++NumSelects;
for.end: ; preds = %for.cond.us, %for.cond.us.us, %entry
ret void
}
+
+; PR 8790
+define void @test2() nounwind ssp {
+entry:
+ br label %func_29.exit
+
+sdf.exit.i:
+ %l_44.1.mux.i = select i1 %tobool5.not.i, i8 %l_44.1.mux.i, i8 1
+ br label %srf.exit.i
+
+srf.exit.i:
+ %tobool5.not.i = icmp ne i8 undef, 0
+ br i1 %tobool5.not.i, label %sdf.exit.i, label %func_29.exit
+
+func_29.exit:
+ ret void
+}