https://bugs.llvm.org/show_bug.cgi?id=43557
Bug ID: 43557
Summary: __builtin_constant_p returns 1 instead of 0 when there
is a side effect
Product: new-bugs
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: release blocker
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: vincent-l...@vinc17.net
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
If the value of __builtin_constant_p is constant, 1 is returned even when there
is a side effect. This is a regression in Clang 9.
Testcase:
#include <stdio.h>
int main (void)
{
int c, i = 0;
c = __builtin_constant_p ((i++, 0));
printf ("%d %d\n", c, i);
return 0;
}
which outputs "1 0" instead of "0 0" with:
clang version 9.0.0-1 (tags/RELEASE_900/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
(Debian package clang-9 1:9-1).
Note: This makes one test of GNU MPFR fail (tcmp_ui) and can affect code using
MPFR, when this user code is built with Clang 9.
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