[llvm-commits] Patch for X86 to use subregs
christopher.lamb at gmail.com
Sat Jul 28 11:52:01 PDT 2007
On Jul 28, 2007, at 1:48 AM, Evan Cheng wrote:
> 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?
It's only lowering (zext i32 to i64) to an insert_subreg on x86-64
where all writes to 32-bit registers implicitly zero-extend into the
> 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.
>> Christopher Lamb
>> llvm-commits mailing list
>> llvm-commits at cs.uiuc.edu
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the llvm-commits