Package: gcc
Version: 4:4.3.3-9
Severity: normal
The code below gives incorrect result for the subtraction when optimisation is
used.
Without optimisation, the difference is 2.
With optimisation, the difference is 0.
#include <stdio.h>
#include <limits.h>
int main(void)
{
int ii;
float ftest;
ii=INT_MAX-1;
ftest=(float)ii;
printf("%d %.11g %.11g\n",ii,ftest,ftest-ii);
return 0;
}
Tested on both gcc 4.3 and 4.4, same error.
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.24
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages gcc depends on:
ii cpp 4:4.3.3-9 The GNU C preprocessor (cpp)
ii gcc-4.3 4.3.4-2 The GNU C compiler
Versions of packages gcc recommends:
ii libc6-dev [libc-dev] 2.9-26 GNU C Library: Development Librari
Versions of packages gcc suggests:
ii autoconf 2.64-2 automatic configure script builder
pn automake1.9 <none> (no description available)
ii bison 1:2.4.1.dfsg-3 A parser generator that is compati
ii flex 2.5.35-8 A fast lexical analyzer generator.
ii gcc-doc 5:2 documentation for the GNU compiler
pn gcc-multilib <none> (no description available)
ii gdb 6.8.50.20090628-4 The GNU Debugger
ii libtool 2.2.6a-4 Generic library support script
ii make 3.81-6 An utility for Directing compilati
ii manpages-dev 3.22-1 Manual pages about using GNU/Linux
-- no debconf information
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