https://llvm.org/bugs/show_bug.cgi?id=26407
Bug ID: 26407
Summary: Wrong constant folding
Product: libraries
Version: trunk
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Backend: C
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
LLVM + clang 3.9 for x86_64 miscompiles the following code.
% cat test.c
int x = 0;
int y = -1;
int main (void)
{
int a = 0x7fffffff + x;
int b = 0x7fffffff + y;
int f = (unsigned int) a >= (unsigned int) b;
if ( f != 1 ) { __builtin_abort(); }
return 0;
}
% clang-3.9 test.c -O1
% ./a.out
zsh: abort ./a.out
% clang-3.9 -v
clang version 3.9.0 (trunk 259289)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
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