[llvm] r267424 - [lanai] Expand findClosestSuitableAluInstr check to consider offset register.

[Jacques Pienaar via llvm-commits]

Author: jpienaar
Date: Mon Apr 25 11:41:21 2016
New Revision: 267424

URL: http://llvm.org/viewvc/llvm-project?rev=267424&view=rev
Log:
[lanai] Expand findClosestSuitableAluInstr check to consider offset register.

Previously findClosestSuitableAluInstr was only considering the base register when checking the current instruction for suitability. Expand check to consider the offset if the offset is a register.


Modified:
    llvm/trunk/lib/Target/Lanai/LanaiMemAluCombiner.cpp

Modified: llvm/trunk/lib/Target/Lanai/LanaiMemAluCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Lanai/LanaiMemAluCombiner.cpp?rev=267424&r1=267423&r2=267424&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Lanai/LanaiMemAluCombiner.cpp (original)
+++ llvm/trunk/lib/Target/Lanai/LanaiMemAluCombiner.cpp Mon Apr 25 11:41:21 2016
@@ -347,9 +347,12 @@ MbbIterator LanaiMemAluCombiner::findClo
       return First;
     }
 
-    // Usage of the base register of a form not suitable for merging
-    if (First != Last && InstrUsesReg(First, Base)) {
-      break;
+    // Usage of the base or offset register is not a form suitable for merging.
+    if (First != Last) {
+      if (InstrUsesReg(First, Base))
+        break;
+      if (Offset->isReg() && InstrUsesReg(First, Offset))
+        break;
     }
   }