target/10286: type-punning doesn't work with _

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* target/10286: type-punning doesn't work with __m64 and -O
@ 2003-04-01 17:36 mgw
  0 siblings, 0 replies; only message in thread
From: mgw @ 2003-04-01 17:36 UTC (permalink / raw)
  To: gcc-gnats


>Number:         10286
>Category:       target
>Synopsis:       type-punning doesn't work with __m64 and -O
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 01 17:36:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     mgw@mac.com
>Release:        gcc-3.2.2
>Organization:
>Environment:
Mandrake Linux 9.1.1
>Description:
the following program (.i attached) prints:

44 33 22 11 00 00 00 00 44 33 22 11 00 00 00 00 44 33 22 11 00 00 00 00 

instead of the expected:

88 77 66 55 44 33 22 11 88 77 66 55 44 33 22 11 88 77 66 55 44 33 22 11 

the generated assembly uses a movd to fill in %mm0, leaving the upper 32-bits empty.

// gcc -O -mmmx -o set64 set64.c
#include <mmintrin.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

void
memset64(void *dst, uint32_t hi, uint32_t lo, size_t count)
{
        __m64 *p = (__m64 *)dst;
        __m64 fill = _mm_set_pi32(hi, lo);

        while (count--) {
                *p++ = fill;
        }
}

#define NUM 3 
int
main()
{
        uint8_t *buf = (uint8_t *)calloc(NUM * 2, sizeof(uint32_t));
        int i, count = NUM * 2 * sizeof(uint32_t);

        memset64(buf, 0x11223344, 0x55667788, NUM);
        for (i = 0; i < count; i++) {
                printf("%02x ", buf[i]);
        }
        printf("\n");
        return 0;
}
>How-To-Repeat:
run attached program built with -O -mmmx
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="set64.i"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="set64.i"

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