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Subject: inline-asm/9637: arguments passed/return to asm block via mmx registers trigger failure
X-SW-Source: 2003-02/txt/msg00439.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         9637
>Category:       inline-asm
>Synopsis:       arguments passed/return to asm block via mmx registers trigger failure
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 09 18:56:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Philip Graham Willoughby
>Release:        gcc-3.2.2
>Organization:
>Environment:
SuSE Linux 7.2, glibc 2.2.2, binutils 2.13.1
>Description:
This error occurs with -O:
test.c: In function `AMD_sqrt':
test.c:18: Internal compiler error in fixup_var_refs_1, at function.c:1966

and this error without:
test.c: In function `AMD_sqrt':
test.c:18: Internal compiler error in instantiate_virtual_regs_1, at function.c:3971

When attempting to compile the following:

float
AMD_sqrt (float param)
{
  long long a, b, c;
  memcpy (&c, &param, sizeof (float));
  c >>= 32;
  asm("pfrsqrt    %y1, %y0 \n\t"
      "movq       %y2, %y1 \n\t"
      "pfmul      %y1, %y1 \n\t"
      "pfrsqit1   %y1, %y0 \n\t"
      "pfrcpit2   %y1, %y2 \n\t"
      "pfmul      %y0, %y1 \n\t"
      : "=y" (c), "=y" (a), "=y" (b)
      :"0" (c));
  memcpy (&param, &c, sizeof (float));
  c <<= 32;
  return param;
}

I have not used MMX assembler in GCC before, so I am willing to be told I'm responsible for this error.  However, I think it'd be best if it didn't fail in quite so dramatic a way.
>How-To-Repeat:
gcc -c -o test.o test.c

Where test.c contains the above code.  Adding/removing -O will let you see both cases.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: