From 3a155f0e34f3d33920b6a9308ae3464f5c506438 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Thu, 30 Apr 2009 21:24:03 +0000 Subject: [PATCH] Join cross class copies using getCommonSubClass() git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70513 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SimpleRegisterCoalescing.cpp | 28 +++++++----------------- 1 file changed, 8 insertions(+), 20 deletions(-) diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp index 9a55a642d84..9d1297b72c4 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.cpp +++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp @@ -1482,27 +1482,15 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) { } Limit = allocatableRCRegs_[DstRC].count(); } else if (!SrcIsPhys && !DstIsPhys) { - unsigned SrcSize = SrcRC->getSize(); - unsigned DstSize = DstRC->getSize(); - if (SrcSize < DstSize) - // For example X86::MOVSD2PDrr copies from FR64 to VR128. - NewRC = DstRC; - else if (DstSize > SrcSize) { - NewRC = SrcRC; - std::swap(LargeReg, SmallReg); - } else { - unsigned SrcNumRegs = SrcRC->getNumRegs(); - unsigned DstNumRegs = DstRC->getNumRegs(); - if (DstNumRegs < SrcNumRegs) - // Sub-register class? - NewRC = DstRC; - else if (SrcNumRegs < DstNumRegs) { - NewRC = SrcRC; - std::swap(LargeReg, SmallReg); - } else - // No idea what's the right register class to use. - return false; + NewRC = getCommonSubClass(SrcRC, DstRC); + if (!NewRC) { + DOUT << "\tDisjoint regclasses: " + << SrcRC->getName() << ", " + << DstRC->getName() << ".\n"; + return false; // Not coalescable. } + if (DstRC->getSize() > SrcRC->getSize()) + std::swap(LargeReg, SmallReg); } // If we are joining two virtual registers and the resulting register