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and is already available, instead of falling back to emitting a load, fall back to emitting a reg-reg copy. This generates significantly better code for some SSE testcases, as SSE has lots of two-address instructions and none of them are read/modify/write. As one example, this change does: pshufd %XMM5, XMMWORD PTR [%ESP + 84], 255 xorps %XMM2, %XMM5 cmpltps %XMM1, %XMM0 - movaps XMMWORD PTR [%ESP + 52], %XMM0 - movapd %XMM6, XMMWORD PTR [%ESP + 52] + movaps %XMM6, %XMM0 cmpltps %XMM6, XMMWORD PTR [%ESP + 68] movapd XMMWORD PTR [%ESP + 52], %XMM6 movaps %XMM6, %XMM0 cmpltps %XMM6, XMMWORD PTR [%ESP + 36] cmpltps %XMM3, %XMM0 - movaps XMMWORD PTR [%ESP + 20], %XMM0 - movapd %XMM7, XMMWORD PTR [%ESP + 20] + movaps %XMM7, %XMM0 cmpltps %XMM7, XMMWORD PTR [%ESP + 4] movapd XMMWORD PTR [%ESP + 20], %XMM7 cmpltps %XMM4, %XMM0 ... which is far better than a store followed by a load! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28001 91177308-0d34-0410-b5e6-96231b3b80d8 |
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.. | ||
SelectionDAG | ||
AsmPrinter.cpp | ||
BranchFolding.cpp | ||
DwarfWriter.cpp | ||
ELFWriter.cpp | ||
IntrinsicLowering.cpp | ||
LiveInterval.cpp | ||
LiveIntervalAnalysis.cpp | ||
LiveVariables.cpp | ||
MachineBasicBlock.cpp | ||
MachineCodeEmitter.cpp | ||
MachineDebugInfo.cpp | ||
MachineFunction.cpp | ||
MachineInstr.cpp | ||
Makefile | ||
Passes.cpp | ||
PHIElimination.cpp | ||
PhysRegTracker.h | ||
PrologEpilogInserter.cpp | ||
RegAllocLinearScan.cpp | ||
RegAllocLocal.cpp | ||
RegAllocSimple.cpp | ||
TwoAddressInstructionPass.cpp | ||
UnreachableBlockElim.cpp | ||
VirtRegMap.cpp | ||
VirtRegMap.h |