http://llvm.org/bugs/show_bug.cgi?id=8268
Summary: constant folder misses negative GEP
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Core LLVM classes
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=5546)
--> (http://llvm.org/bugs/attachment.cgi?id=5546)
.ll of foo() after -O2
The C++ testcase on Linux is:
#include <string>
using namespace std;
void foo() { string s; }
which optimizes down to nothing with gcc, but produces the attached .ll file in
clang++. The problem is this hideous constant expression:
i1 icmp eq ([0 x i32]* bitcast (i8* getelementptr (%"_Rep"* bitcast ([0 x i32]*
@foo to %"_Rep"*), i32 1, i32 0, i32 -12) to [0 x i32]*), [0 x i32]* @foo)
where %"_Rep" = type { [12 x i8] } . Target data is available, though offhand I
don't think it should be needed.
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