[llvm-commits] [llvm] r77758 - /llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp

[Dan Gohman]

Author: djg
Date: Fri Jul 31 19:31:02 2009
New Revision: 77758

URL: http://llvm.org/viewvc/llvm-project?rev=77758&view=rev
Log:
The X86 maximal stack alignment calculator preserves the CFG. Also,
be more careful about the return value of runOnMachineFunction.

Modified:
    llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp

Modified: llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp?rev=77758&r1=77757&r2=77758&view=diff

==============================================================================
--- llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp Fri Jul 31 19:31:02 2009
@@ -1451,14 +1451,21 @@
            RegNum < RI.getLastVirtReg(); ++RegNum)
         MaxAlign = std::max(MaxAlign, RI.getRegClass(RegNum)->getAlignment());
 
-      FFI->setMaxAlignment(MaxAlign);
+      if (FFI->getMaxAlignment() == MaxAlign)
+        return false;
 
-      return false;
+      FFI->setMaxAlignment(MaxAlign);
+      return true;
     }
 
     virtual const char *getPassName() const {
       return "X86 Maximal Stack Alignment Calculator";
     }
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesCFG();
+      MachineFunctionPass::getAnalysisUsage(AU);
+    }
   };
 
   char MSAC::ID = 0;