#1603: a miscompilation of (`rem` 0x40000000)::Int with -O -fvia-C
--------------------------+-------------------------------------------------
Reporter: Isaac Dupree | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.10.1
Component: None | Version: 6.8.1
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: numeric/1603 | Architecture: Multiple
Os: Multiple |
--------------------------+-------------------------------------------------
Changes (by igloo):
* milestone: Not GHC => 6.10.1
Comment:
gcc looks fixed now:
{{{
$ cat q.c
#include <stdio.h>
int f(unsigned int x)
{
printf("%x %d\n", x, (int)x);
return ((int)x) % 4;
}
int main(int argc, char *argv[])
{
printf("%d\n", f((unsigned int)(-1)));
return 0;
}
$ gcc-4.1 q.c -Wall -o q && ./q
ffffffff -1
3
$ gcc-4.2 q.c -Wall -o q && ./q
ffffffff -1
-1
$ gcc-4.2 --version
gcc-4.2 (GCC) 4.2.4 20080512 (prerelease) (Debian 4.2.3-6)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
}}}
We should confirm the test passes with ghc and stop skipping it.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1603#comment:4>
GHC <http://www.haskell.org/ghc/>
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