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| author | Cameron Zwarich <zwarich@apple.com> | 2010-12-28 10:49:33 +0000 |
|---|---|---|
| committer | Cameron Zwarich <zwarich@apple.com> | 2010-12-28 10:49:33 +0000 |
| commit | 92f0fcb6df128ab99a63986b5be00e80fc9f98c6 (patch) | |
| tree | 1d3fdc421386e2c967a4fd57f2f60de14103432f /lib/CodeGen/StrongPHIElimination.cpp | |
| parent | 2aea490e163b53e966d693285c17c1a934db5e8d (diff) | |
| download | llvm-92f0fcb6df128ab99a63986b5be00e80fc9f98c6.tar.gz llvm-92f0fcb6df128ab99a63986b5be00e80fc9f98c6.tar.bz2 llvm-92f0fcb6df128ab99a63986b5be00e80fc9f98c6.tar.xz | |
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
Diffstat (limited to 'lib/CodeGen/StrongPHIElimination.cpp')
| -rw-r--r-- | lib/CodeGen/StrongPHIElimination.cpp | 7 |
1 files changed, 3 insertions, 4 deletions
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<unsigned, unsigned>& 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)) |