From 33524c3b26e3b709488d84094493d9a6098c0155 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Wed, 14 Oct 2009 21:22:39 +0000
Subject: Make loop not recalc getNumOperands() each time around

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84138 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/PrologEpilogInserter.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

(limited to 'lib/CodeGen/PrologEpilogInserter.cpp')

diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp
index 74cc18b..7af0bba 100644
--- a/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/lib/CodeGen/PrologEpilogInserter.cpp
@@ -778,9 +778,7 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
     // directly.
     for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ++I) {
       MachineInstr *MI = I;
-      // Likewise, call getNumOperands() each iteration, as the MI may change
-      // inside the loop (with 'i' updated accordingly).
-      for (unsigned i = 0; i != MI->getNumOperands(); ++i)
+      for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i)
         if (MI->getOperand(i).isReg()) {
           MachineOperand &MO = MI->getOperand(i);
           unsigned Reg = MO.getReg();
@@ -853,6 +851,7 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
               // just calculating the value we already have.
               BB->erase(I, LastUseMI);
               MI = I = LastUseMI;
+              e = MI->getNumOperands();
 
               CurrentScratchReg = PrevScratchReg;
               // Extend the live range of the register
-- 
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