From d7ee0fcac992a0eced1902b643c1eca91aba565e Mon Sep 17 00:00:00 2001 From: Cameron Zwarich Date: Fri, 20 May 2011 23:25:36 +0000 Subject: Fix PR9962 by properly constraining register classes in RemoveCopyByCommutingDef(). This actually fixes most of the VerifyCoalescing failures in test-suite. llvm-svn: 131768 --- llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'llvm/lib/CodeGen') diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp index c33ce24c5e8..21184895ccb 100644 --- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp +++ b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp @@ -430,6 +430,10 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(const CoalescerPair &CP, MachineInstr *NewMI = tii_->commuteInstruction(DefMI); if (!NewMI) return false; + if (TargetRegisterInfo::isVirtualRegister(IntA.reg) && + TargetRegisterInfo::isVirtualRegister(IntB.reg) && + !mri_->constrainRegClass(IntB.reg, mri_->getRegClass(IntA.reg))) + return false; if (NewMI != DefMI) { li_->ReplaceMachineInstrInMaps(DefMI, NewMI); MBB->insert(DefMI, NewMI); -- cgit v1.2.3