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[Bug middle-end/30568] -ftrapping-math should prevent folding/dead code stripping of some builtins
- From: "fxcoudert at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 29 Dec 2009 21:51:37 -0000
- Subject: [Bug middle-end/30568] -ftrapping-math should prevent folding/dead code stripping of some builtins
- References: <bug-30568-638@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #6 from fxcoudert at gcc dot gnu dot org 2009-12-29 21:51 -------
Confirming this as generic, non Darwin-specific bug. On i686-linux with current
trunk:
$ cat a.c
#include <stdio.h>
#include <math.h>
#include <fenv.h>
main()
{
unsigned flags;
feclearexcept(FE_ALL_EXCEPT);
(void)acos(1.1);
flags = fetestexcept(FE_ALL_EXCEPT);
printf("(void)acos( %e ) gives flags 0x%8x\n", 1.1, flags & FE_ALL_EXCEPT);
}
$ gcc a.c -ftrapping-math -O0 -fno-math-errno -lm && ./a.out
(void)acos( 1.100000e+00 ) gives flags 0x 0
--
fxcoudert at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
GCC target triplet|*-*-darwin* |
Last reconfirmed|2007-01-24 10:25:28 |2009-12-29 21:51:37
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30568