https://llvm.org/bugs/show_bug.cgi?id=24179
Bug ID: 24179
Summary: mem2reg generates incorrect code
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Running -mem2reg on
declare i1 @use(i32)
define void @f() {
entry:
%t = alloca i32
br label %loop
loop:
%v = load i32, i32* %t
%c = call i1 @use(i32 %v)
store i32 46, i32* %t
store i32 42, i32* %t
br i1 %c, label %loop, label %exit
exit:
ret void
}
gives
declare i1 @use(i32)
define void @f() {
entry:
br label %loop
loop: ; preds = %loop, %entry
%c = tail call i1 @use(i32 undef)
br i1 %c, label %loop, label %exit
exit: ; preds = %loop
ret void
}
when %c should be undef only on the first iteration and 42 for all subsequent
iterations.
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