[llvm-commits] CVS: llvm/lib/Target/X86/X86InstrInfo.cpp

[Dale Johannesen]

Changes in directory llvm/lib/Target/X86:

X86InstrInfo.cpp updated: 1.88 -> 1.89
---
Log message:

Handle blocks with 2 unconditional branches in AnalyzeBranch.


---
Diffs of the changes:  (+10 -0)

 X86InstrInfo.cpp |   10 ++++++++++
 1 files changed, 10 insertions(+)


Index: llvm/lib/Target/X86/X86InstrInfo.cpp
diff -u llvm/lib/Target/X86/X86InstrInfo.cpp:1.88 llvm/lib/Target/X86/X86InstrInfo.cpp:1.89
--- llvm/lib/Target/X86/X86InstrInfo.cpp:1.88	Fri Jun  8 16:59:56 2007
+++ llvm/lib/Target/X86/X86InstrInfo.cpp	Wed Jun 13 12:59:52 2007
@@ -427,6 +427,16 @@
     return false;
   }
 
+  // If the block ends with two X86::JMPs, handle it.  The second one is not
+  // executed, so remove it.
+  if (SecondLastInst->getOpcode() == X86::JMP && 
+      LastInst->getOpcode() == X86::JMP) {
+    TBB = SecondLastInst->getOperand(0).getMachineBasicBlock();
+    I = LastInst;
+    I->eraseFromParent();
+    return false;
+  }
+
   // Otherwise, can't handle this.
   return true;
 }