This may or may not be useful, but with altivec you can print the
vector registers as such:
(gdb) p $v1
$1 = {
  uint128 = 0x7fffdead7fffdead7fffdead7fffdead, 
  v4_float = {nan(0x7fdead), nan(0x7fdead), nan(0x7fdead), nan(0x7fdead)}, 
  v4_int32 = {2147475117, 2147475117, 2147475117, 2147475117}, 
  v8_int16 = {32767, -8531, 32767, -8531, 32767, -8531, 32767, -8531}, 
  v16_int8 = "\177?Þ\177?Þ\177?Þ\177?Þ"
}
(gdb) 

MMX/SSE may be similar, but others can probably provide better info.

On 5/10/05, Tres Melton <[EMAIL PROTECTED]> wrote:
> 
> BTW, do you know how to get gdb to display the contents of a xmm
> register on AMD64 in hex?  "info all-registers" and variants only show
> the values as floats.  (The registers are shared between the SSE and x87
> stuff but I'm not using x87).  And I tried gdb ver. 6.0-r1 in Gentoo,
> 6.3 from gnu.org and the latest cvs.
> 
> --
> Tres
> 
> 
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