[darwinbuild] Re: Darwin 8.0.1 gcc for pentiumpro

[Shantonu Sen]

The patched roots work for me (at least gcc_os (gcc 3.3) did). How  
did you install it?

Shantonu

On Aug 6, 2005, at 7:57 AM, Michael Franz wrote:

>> You can just look at the generated assembly. Like this:
>> [shantonu at localhost]$ cat foo.c
>> int foo(double a) {
>>   return (int)a;
>> }
>> [shantonu@ localhost]$ cc -S -o - -arch i386 foo.c | grep xmm
>>         movsd   -16(%ebp), %xmm0
>>         cvttsd2si       %xmm0, %eax
>> [shantonu@ localhost]$ cc -S -o - -arch i386 foo.c -mno-sse2 |  
>> grep xmm
>> [shantonu@ localhost]$ cc -S -o - -arch i386 foo.c - 
>> march=pentiumpro | grep
>> xmm
>> [shantonu@ localhost]$
>>
>> If you don't get any output for all 3 invocations, your compiler  
>> is not
>> auto-generating SSE2 instructions (or at least, that's a pretty good
>> metric). There are probably SSE(1) instructions that use the xmm  
>> registers,
>> this is just a quick heuristic for this one program.
>>
>>
> When I run this test on the base install, 1 & 3 have output, the same
> for using the patched roots.  However, when I build the patched gcc
> myself, the resulting compiler produces no mmx results.  So, do I
> infer that the patched roots ARE producing SSE2, but that the gcc
> patch does work?
>
> Michael
>