[PATCH] D128123: [SDAG] try to replace subtract-from-constant with xor

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


================
Comment at: llvm/test/CodeGen/AMDGPU/ds-sub-offset.ll:132
+; GFX10-NEXT:    ds_write_b8 v0, v1
 ; GFX10-NEXT:    s_endpgm
   %x.i = call i32 @llvm.amdgcn.workitem.id.x() #0
----------------
RKSimon wrote:
> Based off @foad's comments on D128080 - we need to either add a TLI override to control this or add a way for AMDGPU to reverse it.
Hmm - how similar is TargetLowering::preferIncOfAddToSubOfNot ?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128123/new/

https://reviews.llvm.org/D128123