http://llvm.org/bugs/show_bug.cgi?id=16605
Bug ID: 16605
Summary: wrong code at -Os and above on x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following code is miscompiled by clang trunk (as well as clang 3.2 and 3.3)
on x86_64-linux-gnu at -Os and above.
$ clang-trunk -v
clang version 3.4 (trunk 186068)
Target: x86_64-pc-linux-gnu
Thread model: posix
$
$ clang-trunk -Os reduced.c
$ a.out; echo $?
1
$ clang-trunk -O1 reduced.c
$ a.out; echo $?
0
$ clang-3.3 -Os reduced.c
$ a.out; echo $?
1
$ clang-3.2 -Os reduced.c
$ a.out; echo $?
1
$
---------------------------------------------------
int a = -1, b;
unsigned int foo (int p) { return p; }
int main ()
{
if ((b = 1 % foo (a)) > a)
return 0;
return 1;
}
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