[llvm-commits] Patch for X86 to use subregs

[Evan Cheng]

Very cool! I need to read it more carefully. But I see you are  
lowering zext to a single insert_subreg. Is that right? It won't zero  
out the top part, no?

Evan

Sent from my iPhone

On Jul 28, 2007, at 12:17 AM, Christopher Lamb <christopher.lamb at gmail.com 
 > wrote:

> This patch changes the X86 back end to use the new subreg operations  
> for appropriate truncate and extend operations. This should allow  
> regression testing of the subreg feature going forward, as it's now  
> used in a public target.
>
> The patch passed DejaGnu and all of SingleSource on my x86 machine,  
> but there are changes for x86-64 as well which I haven't been able  
> to test. Output assembly for x86-64 appears sane, but I'd appreciate  
> someone giving the patch a try on their x86-64 system. Other 32-bit  
> x86 testing is also appreciated.
>
> Thanks
> --
> Christopher Lamb
>
> <x86_subregs.patch>
>
>
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