Bug#89949: marked as done ([PR optimization/3506]: weird behaviour when incrementing volatile ints)
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Received: (at submit) by bugs.debian.org; 17 Mar 2001 01:53:08 +0000
>From herbert@gondor.apana.org.au Fri Mar 16 19:53:08 2001
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Date: Sat, 17 Mar 2001 12:53:02 +1100
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From: <herbert@gondor.apana.org.au>
Subject: gcc: weird behaviour when incrementing volatile ints
To: submit@bugs.debian.org
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Package: gcc
Version: 1:2.95.3-5
Severity: normal
gcc generates non-intuitive code when one tries to increment a volatile int.
extern int x;
extern volatile int y;
void f() {
x++;
y++;
}
gives
.file "a.c"
.version "01.01"
gcc2_compiled.:
.text
.align 4
.globl f
.type f,@function
f:
pushl %ebp
movl %esp,%ebp
incl x
movl y,%eax
incl %eax
movl %eax,y
leave
ret
.Lfe1:
.size f,.Lfe1-f
.ident "GCC: (GNU) 2.95.3 20010219 (prerelease)"
The move into %eax seems pointless. The same thing happens with 2.97.
-- System Information
Debian Release: testing/unstable
Kernel Version: Linux gondor 2.4.2-586tsc #20 Sat Mar 3 22:23:28 EST 2001 i586 unknown
Versions of the packages gcc depends on:
ii cpp 2.95.3-5 The GNU C preprocessor.
ii cpp-2.95 2.95.3-6 The GNU C preprocessor.
ii gcc-2.95 2.95.3-6 The GNU C compiler.
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Received: (at 89949-done) by bugs.debian.org; 27 May 2002 20:44:23 +0000
>From doko@cs.tu-berlin.de Mon May 27 15:44:23 2002
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From: Matthias Klose <doko@cs.tu-berlin.de>
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Message-ID: <15602.39454.927385.51398@gargle.gargle.HOWL>
Date: Mon, 27 May 2002 22:42:06 +0200
To: 89949-done@bugs.debian.org
Subject: bug report closed by upstream developer
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Delivered-To: 89949-done@bugs.debian.org
See http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3506&database=gcc
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