http://llvm.org/bugs/show_bug.cgi?id=4189
Summary: redundant load from constant not eliminated
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
void
copy_text (char *p)
{
const char *text = "hello world/n";
do
{
*p = *text;
}
while (*text++);
}
->
@.str = internal constant [14 x i8] c"hello world/n\00" ; <[14 x i8]*>
[#uses=1]
define void @copy_text(i8* nocapture %p) nounwind {
entry:
br label %bb
bb: ; preds = %bb, %entry
%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %bb ] ; <i64>
[#uses=2]
%tmp = add i64 %indvar, ptrtoint ([14 x i8]* @.str to i64)
; <i64> [#uses=1]
%text.0 = inttoptr i64 %tmp to i8* ; <i8*> [#uses=2]
%0 = load i8* %text.0, align 1 ; <i8> [#uses=1]
store i8 %0, i8* %p, align 1
%1 = load i8* %text.0, align 1 ; <i8> [#uses=1]
%2 = icmp eq i8 %1, 0 ; <i1> [#uses=1]
%indvar.next = add i64 %indvar, 1 ; <i64> [#uses=1]
br i1 %2, label %return, label %bb
return: ; preds = %bb
ret void
}
The second load is redundant.
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