http://llvm.org/bugs/show_bug.cgi?id=14972
Bug #: 14972
Summary: bad code for struct on x86
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
We've found the following snippet (derived from 931004-11.c in the gcc
testsuite) which fails with clang 3.2 and trunk when compiled for x86_64-linux
for 32-bits, using -O1 or higher optimizations, but works fine at -O0 or -Os:
$ clang -m32 -O reduced.c
$ ./a.out
Aborted (core dumped)
$ clang -m32 -O0 reduced.c
$ ./a.out
$ clang -v
clang version 3.3 (trunk 172630)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ cat reduced.c
#include <stdlib.h>
struct tiny
{
char c;
char d;
char e;
};
void foo (struct tiny x)
{
if (x.c != 1)
abort();
if (x.e != 1)
abort();
}
int main ()
{
struct tiny s;
s.c = 1;
s.d = 1;
s.e = 1;
foo(s);
return 0;
}
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