[PATCH] D20071: AMDGPU: Make some instructions convergent

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added a subscriber: arsenm.

http://reviews.llvm.org/D20071

Files:
  lib/Target/AMDGPU/SIInstructions.td

Index: lib/Target/AMDGPU/SIInstructions.td
===================================================================
--- lib/Target/AMDGPU/SIInstructions.td
+++ lib/Target/AMDGPU/SIInstructions.td
@@ -1218,7 +1218,9 @@
   (ins VS_32:$src0),
   "v_readfirstlane_b32 $vdst, $src0",
   []
->;
+> {
+  let isConvergent = 1;
+}
 
 }
 
@@ -1585,6 +1587,8 @@
 
 } // End isCommutable = 1
 
+let isConvergent = 1 in {
+
 defm V_READLANE_B32 : VOP2SI_3VI_m <
   vop3 <0x001, 0x289>,
   "v_readlane_b32",
@@ -1601,6 +1605,8 @@
   "v_writelane_b32 $vdst, $src0, $src1"
 >;
 
+} // End isConvergent = 1
+
 // These instructions only exist on SI and CI
 let SubtargetPredicate = isSICI in {
 


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