http://llvm.org/bugs/show_bug.cgi?id=19174
Bug ID: 19174
Summary: -O1 breaks std::abs
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: release blocker
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The appended snippet, when compiled and executed thus:
clang++ -o a.out t.cpp -O1 && ./a.out
produces the following output:
z: -1372777060 abs(z): -1372777060
Removing -O1 results in the correct output.
My clang version:
Ubuntu clang version 3.5.0-1~exp1 (trunk) (based on LLVM 3.5.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
#include <cmath>
#include <cstdlib>
#include <iostream>
int main ()
{
int z = std::rand () * 4;
std::cout << "z: " << z << " abs(z): " << std::abs (z) << std::endl;
return 0;
}
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