https://llvm.org/bugs/show_bug.cgi?id=25649
Bug ID: 25649
Summary: Wrong constant folding
Product: clang
Version: trunk
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: ishiura-compi...@ml.kwansei.ac.jp
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
LLVM + clang-3.8 miscompiles the following code.
$ cat error.c
int a = 0;
long long b = 1LL;
long long c = 3LL;
volatile unsigned int d = 0U;
int f = 0;
int main ( void )
{
int e = 6 / ((unsigned int)b * (3LL * (3 * c == 9)) << (1 ^ a || d >= 0));
if ( e != 1 ) { f = e; __builtin_abort(); }
return 0;
}
$ clang-3.8 error.c -m32 -w -O3
$ ./a.out
zsh: abort ./a.out
$ clang-3.8 -v
clang version 3.8.0 (trunk 254118)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
InstalledDir: /Users/home/clang/bin
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