[llvm-commits] [PATCH 2/6] revise/enhance atomic primitive code generation

[Michael Liao]

rebased onto r161979 and resubmitted for review.

Yours
- Michael

On Mon, 2012-07-30 at 17:22 -0700, Michael Liao wrote:
> Hi
> 
> Here's the 2nd patch from a series of patch revising/enhancing the
> current atomic primitive code generation support in X86 backend. This
> patch revises all pseudo atomic instruction based on CMPXCHG.
> 
> * One load is removed from the spin-loop to reduce loop overhead as
> CMPXCHG will load that memory operand.
> * Since most of them shares the same code skelteton and only differ each
> other by the updating logic, they are unified into the same one,
> EmitAtomicLoadArith and EmitAtomicLoadArith6432 (for 64-bit operand on
> 32-bit target.)
> * remove physical register constraints on pseudo atomic instructions
> * add pseudo CMOV support if the underly targets have no CMOV feature
> * refine test cases due to the spin-loop change
> 
> Please review them and commit if they're OK.
> 
> Yours
> - Michael
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits

-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0002-refine-code-generation-for-atomic-operations-with-sp.patch
Type: text/x-patch
Size: 49774 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20120815/58d6b76b/attachment.bin>