Bug#20889: marked as done ([Fixed in upstream {gcc,egcc}-2.92.21] Inconsistent results got by gcc-optimized code)
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and subject line closing gcc272 bugs
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From: Masami Takikawa <takikawm@cs.orst.edu>
Subject: Inconsistent results got by gcc-optimized code.
Date: Wed, 08 Apr 1998 16:29:43 -0700
Sender: logic@bsjnext.bsj.com
Package: gcc
Version: 2.7.2.3-4 and older
Also,
Package: g++
Version: 2.90.27-0.3
The following program produces different results depending on
whether -O flag is given.
$ cat bug.c
#include <stdio.h>
static double d1 = 31128881900274143232.0;
static double d2 = 1275889274032.0;
static double d3 = 31128880624384869200.0;
int main() {
double d4;
printf("%.20g %.20g %.20g\n", d1, d2, d3);
d4 = d1 - d2;
if (d3 < d4)
printf("%.20g< %.20g\n", d3, d4);
else
printf("%.20g>=%.20g\n", d3, d4);
printf("%.20g< %.20g = %d\n", d3, d4, (d3 < d4));
printf("%.20g==%.20g = %d\n", d3, d4, (d3 == d4));
printf("%.20g> %.20g = %d\n", d3, d4, (d3 > d4));
return 0;
}
$ gcc bug.c
$ a.out
31128881900274143232 1275889274032 31128880624384868352
31128880624384868352>=31128880624384868352
31128880624384868352< 31128880624384868352 = 0
31128880624384868352==31128880624384868352 = 1
31128880624384868352> 31128880624384868352 = 0
$ gcc -O bug.c
$ a.out
31128881900274143232 1275889274032 31128880624384868352
31128880624384868352< 31128880624384868352
31128880624384868352< 31128880624384868352 = 0
31128880624384868352==31128880624384868352 = 1
31128880624384868352> 31128880624384868352 = 0
Note that the unoptimized code produces consistent results
while the optimized code produces inconsistent results.
I am using Debian 2.0, kernel-source-2 2.0.33-6,
and libc6 2.0.7pre1-4.wc.
Masami
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Date: Thu, 12 Apr 2001 23:52:39 +0200 (MEST)
To: 4429-done@bugs.debian.org, 4430-done@bugs.debian.org,
4954-done@bugs.debian.org, 5367-done@bugs.debian.org,
6047-done@bugs.debian.org, 12375-done@bugs.debian.org,
20606-done@bugs.debian.org, 20889-done@bugs.debian.org,
24788-done@bugs.debian.org, 26100-done@bugs.debian.org,
34322-done@bugs.debian.org, 48726-done@bugs.debian.org,
54544-done@bugs.debian.org, 63154-done@bugs.debian.org
Subject: closing gcc272 bugs
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Message-ID: <15062.8940.590633.88211@bolero>
Delivered-To: 20889-done@bugs.debian.org
gcc272 (2.7.2.3-18) unstable; urgency=low
* Close all gcc272 in the Debian bug tracking archive. The use of
gcc272 is deprecated. The only reason it exists is to have a
compiler for the linux kernel 2.0.x.
The bug reports for gcc272 are still available on
http://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=gcc272&archive=yes
Closes: #4429, #4430, 4954, #5367, #6047, #12375, #20606, #20889,
#24788, #26100, #34322, #48726, #54544, #63154.
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