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[Bug middle-end/30364] [4.1/4.2/4.3 Regression] Wrong variable ranges due to constant folding
- From: "guillaume dot melquiond at ens-lyon dot fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Jan 2007 11:25:33 -0000
- Subject: [Bug middle-end/30364] [4.1/4.2/4.3 Regression] Wrong variable ranges due to constant folding
- References: <bug-30364-7904@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from guillaume dot melquiond at ens-lyon dot fr 2007-01-04 11:25 -------
Just for the sake of completeness. Wrong code is also generated when addition
and multiplication are mixed, because of distributivity:
int f(int a)
{
if (a > 0x7FFFFFF0) return 0;
int b = (a - 20) * 2;
return b > 0x7FFFFFF0;
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30364