Author: matze Date: Wed Sep 28 13:17:12 2016 New Revision: 282615 URL: http://llvm.org/viewvc/llvm-project?rev=282615&view=rev Log: Cherry pick r281957 (see http://llvm.org/PR30463)
Added: llvm/branches/release_39/test/CodeGen/X86/branchfolding-undef.mir - copied unchanged from r281957, llvm/trunk/test/CodeGen/X86/branchfolding-undef.mir Modified: llvm/branches/release_39/ (props changed) llvm/branches/release_39/lib/CodeGen/BranchFolding.cpp Propchange: llvm/branches/release_39/ ------------------------------------------------------------------------------ --- svn:mergeinfo (original) +++ svn:mergeinfo Wed Sep 28 13:17:12 2016 @@ -1,3 +1,3 @@ /llvm/branches/Apple/Pertwee:110850,110961 /llvm/branches/type-system-rewrite:133420-134817 -/llvm/trunk:155241,275868-275870,275879,275898,275928,275935,275946,275978,275981,276015,276051,276077,276109,276119,276181,276209,276236-276237,276358,276364,276368,276389,276435,276438,276479,276510,276648,276676,276712,276740,276823,276956,276980,277093,277114,277135,277371,277399,277500,277504,277625,277691,277693,277773,278002,278086,278133,278157,278343,278370,278413,278558-278559,278562,278569,278571,278573,278575,278584,278841,278900,278938,278999,279125,279268,279369,279647 +/llvm/trunk:155241,275868-275870,275879,275898,275928,275935,275946,275978,275981,276015,276051,276077,276109,276119,276181,276209,276236-276237,276358,276364,276368,276389,276435,276438,276479,276510,276648,276676,276712,276740,276823,276956,276980,277093,277114,277135,277371,277399,277500,277504,277625,277691,277693,277773,278002,278086,278133,278157,278343,278370,278413,278558-278559,278562,278569,278571,278573,278575,278584,278841,278900,278938,278999,279125,279268,279369,279647,281957 Modified: llvm/branches/release_39/lib/CodeGen/BranchFolding.cpp URL: http://llvm.org/viewvc/llvm-project/llvm/branches/release_39/lib/CodeGen/BranchFolding.cpp?rev=282615&r1=282614&r2=282615&view=diff ============================================================================== --- llvm/branches/release_39/lib/CodeGen/BranchFolding.cpp (original) +++ llvm/branches/release_39/lib/CodeGen/BranchFolding.cpp Wed Sep 28 13:17:12 2016 @@ -776,9 +776,8 @@ bool BranchFolder::CreateCommonTailOnlyB } static void -mergeMMOsFromMemoryOperations(MachineBasicBlock::iterator MBBIStartPos, - MachineBasicBlock &MBBCommon) { - // Merge MMOs from memory operations in the common block. +mergeOperations(MachineBasicBlock::iterator MBBIStartPos, + MachineBasicBlock &MBBCommon) { MachineBasicBlock *MBB = MBBIStartPos->getParent(); // Note CommonTailLen does not necessarily matches the size of // the common BB nor all its instructions because of debug @@ -808,8 +807,18 @@ mergeMMOsFromMemoryOperations(MachineBas "Reached BB end within common tail length!"); assert(MBBICommon->isIdenticalTo(*MBBI) && "Expected matching MIIs!"); + // Merge MMOs from memory operations in the common block. if (MBBICommon->mayLoad() || MBBICommon->mayStore()) MBBICommon->setMemRefs(MBBICommon->mergeMemRefsWith(*MBBI)); + // Drop undef flags if they aren't present in all merged instructions. + for (unsigned I = 0, E = MBBICommon->getNumOperands(); I != E; ++I) { + MachineOperand &MO = MBBICommon->getOperand(I); + if (MO.isReg() && MO.isUndef()) { + const MachineOperand &OtherMO = MBBI->getOperand(I); + if (!OtherMO.isUndef()) + MO.setIsUndef(false); + } + } ++MBBI; ++MBBICommon; @@ -928,8 +937,8 @@ bool BranchFolder::TryTailMergeBlocks(Ma continue; DEBUG(dbgs() << "BB#" << SameTails[i].getBlock()->getNumber() << (i == e-1 ? "" : ", ")); - // Merge MMOs from memory operations as needed. - mergeMMOsFromMemoryOperations(SameTails[i].getTailStartPos(), *MBB); + // Merge operations (MMOs, undef flags) + mergeOperations(SameTails[i].getTailStartPos(), *MBB); // Hack the end off BB i, making it jump to BB commonTailIndex instead. ReplaceTailWithBranchTo(SameTails[i].getTailStartPos(), MBB); // BB i is no longer a predecessor of SuccBB; remove it from the worklist. _______________________________________________ llvm-branch-commits mailing list llvm-branch-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits