From 92f0fcb6df128ab99a63986b5be00e80fc9f98c6 Mon Sep 17 00:00:00 2001 From: Cameron Zwarich Date: Tue, 28 Dec 2010 10:49:33 +0000 Subject: Avoid iterating every operand of an instruction in StrongPHIElimination, since we are only interested in the defs when discovering interferences. This is a 28% speedup running StrongPHIElimination on 403.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122596 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/StrongPHIElimination.cpp | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'lib/CodeGen/StrongPHIElimination.cpp') diff --git a/lib/CodeGen/StrongPHIElimination.cpp b/lib/CodeGen/StrongPHIElimination.cpp index c1a76a6193..f84fdbe5bc 100644 --- a/lib/CodeGen/StrongPHIElimination.cpp +++ b/lib/CodeGen/StrongPHIElimination.cpp @@ -471,10 +471,9 @@ StrongPHIElimination::SplitInterferencesForBasicBlock( DenseMap& ImmediateDominatingParent) { for (MachineBasicBlock::iterator BBI = MBB.begin(), BBE = MBB.end(); BBI != BBE; ++BBI) { - for (unsigned i = 0, e = BBI->getNumOperands(); i != e; ++i) { - MachineOperand& MO = BBI->getOperand(i); - if (!MO.isReg() || !MO.isDef()) - continue; + for (MachineInstr::const_mop_iterator I = BBI->operands_begin(), + E = BBI->operands_end(); I != E && I->isReg() && I->isDef(); ++I) { + const MachineOperand& MO = *I; unsigned DestReg = MO.getReg(); if (!DestReg || !TargetRegisterInfo::isVirtualRegister(DestReg)) -- cgit v1.2.3