Bug 129008 – gcc-4.1 miscompiles altivec constants.

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Luca Barbato 2006-04-06 02:31:55 UTC]

Excerpt from upstream bug

typedef union
{
  int i[4];
  __attribute__((altivec(vector__))) int v;
} vec_int4;

int main (void)
{
   vec_int4 i1;

   i1.v = (__attribute__((altivec(vector__))) int){31, 31, 31, 31};
   printf ("%d\n", i1.i[0]);

   return 0;
}

the output printed is 30, not 31.

Refer to the url to see the rest.

[Comment 1 Luca Barbato 2006-04-06 02:36:06 UTC]

Created attachment 84056 [details, diff]
simple fix, disable this path for odd consts

Here is the simplest solution, a smarter one may follow

[Comment 2 Mark Loeser (RETIRED) 2006-04-07 17:42:48 UTC]

I'm waiting for upstream to decide on how they are going to fix this before I add any patches.

[Comment 3 Mark Loeser (RETIRED) 2006-04-07 20:46:34 UTC]

This really isn't a blocker, since gcc-4.1 is still p.masked.

[Comment 4 Mark Loeser (RETIRED) 2006-04-13 14:59:51 UTC]

Added to CVS.  This will be included in the next patchset.