[Bug middle-end/38999] New: [4.2/4.3/4.4 Regression] Extra overflow warning in 32-bit HWI compiler
jakub at gcc dot gnu dot org
gcc-bugzilla@gcc.gnu.org
Wed Jan 28 11:19:00 GMT 2009
+++ This bug was initially created as a clone of Bug #38934 +++
This failure is not "worked around" by FRE unlike 38932.
/* { dg-do compile } */
/* { dg-options "-O2 --std=gnu99" } */
/* This variable needed only to work around earlier optimizations than VRP. */
unsigned char g;
extern void abort();
void f (long long int p)
{
g = 255;
/* { dg-warning "constant is" "" { target *-*-* } 14 } */
/* { dg-warning "overflow" "" { target *-*-* } 14 } */
if (p >= -9223372036854775808LL - (signed char) g)
p = 1;
if (p)
abort ();
}
3.2.x issued just one warning both in 32-bit HWI i386 gcc and x86_64 -m32 gcc,
haven't checked 3.3, 3.4 and later issues one extra warning in 32-bit HWI
compilation.
--
Summary: [4.2/4.3/4.4 Regression] Extra overflow warning in 32-
bit HWI compiler
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jakub at gcc dot gnu dot org
GCC target triplet: i686-pc-linux-gnu
BugsThisDependsOn: 38934
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999
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