[PATCH] R600: Remove successive JUMP in AnalyzeBranch when AllowModify is true

[Vincent Lejeune]

http://llvm-reviews.chandlerc.com/D2322

Files:
  lib/Target/R600/R600InstrInfo.cpp

Index: lib/Target/R600/R600InstrInfo.cpp
===================================================================
--- lib/Target/R600/R600InstrInfo.cpp
+++ lib/Target/R600/R600InstrInfo.cpp
@@ -720,7 +720,13 @@
     return false;
   }
 
-  // Get the last instruction in the block.
+  // Remove successive JUMP
+  while (I != MBB.begin() && llvm::prior(I)->getOpcode() == AMDGPU::JUMP) {
+      MachineBasicBlock::iterator PriorI = llvm::prior(I);
+      if (AllowModify)
+        I->removeFromParent();
+      I = PriorI;
+  }
   MachineInstr *LastInst = I;
 
   // If there is only one terminator instruction, process it.
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