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Add a (hidden) option to print instructions that fail to fuse. It's looking
like compares and test's would be the next huge win... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11539 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -34,6 +34,11 @@ namespace {
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cl::opt<bool>
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NoFusing("disable-spill-fusing",
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cl::desc("Disable fusing of spill code into instructions"));
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cl::opt<bool>
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PrintFailedFusing("print-failed-fuse-candidates",
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cl::desc("Print instructions that the allocator wants to"
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" fuse, but the X86 backend currently can't"),
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cl::Hidden);
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}
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X86RegisterInfo::X86RegisterInfo()
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@ -135,7 +140,7 @@ bool X86RegisterInfo::foldMemoryOperand(MachineBasicBlock::iterator &MI,
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case X86::ANDri8: NI = MakeMIInst(X86::ANDmi8 , FrameIndex, MI); break;
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case X86::ANDri16: NI = MakeMIInst(X86::ANDmi16, FrameIndex, MI); break;
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case X86::ANDri32: NI = MakeMIInst(X86::ANDmi32, FrameIndex, MI); break;
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default: return false; // Cannot fold
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default: break; // Cannot fold
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}
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} else if (i == 1) {
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switch(MI->getOpcode()) {
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@ -150,16 +155,19 @@ bool X86RegisterInfo::foldMemoryOperand(MachineBasicBlock::iterator &MI,
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case X86::ANDrr32: NI = MakeRMInst(X86::ANDrm32, FrameIndex, MI); break;
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case X86::IMULrr16:NI = MakeRMInst(X86::IMULrm16, FrameIndex, MI); break;
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case X86::IMULrr32:NI = MakeRMInst(X86::IMULrm32, FrameIndex, MI); break;
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case X86::IMULrri16: NI = MakeRMIInst(X86::IMULrmi16, FrameIndex, MI); break;
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case X86::IMULrri32: NI = MakeRMIInst(X86::IMULrmi32, FrameIndex, MI); break;
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default: return false; // cannot fold.
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case X86::IMULrri16: NI = MakeRMIInst(X86::IMULrmi16, FrameIndex, MI);break;
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case X86::IMULrri32: NI = MakeRMIInst(X86::IMULrmi32, FrameIndex, MI);break;
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default: break;
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}
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} else {
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return false; // cannot fold.
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}
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MI = MBB.insert(MBB.erase(MI), NI);
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return true;
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if (NI) {
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MI = MBB.insert(MBB.erase(MI), NI);
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return true;
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} else {
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if (PrintFailedFusing)
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std::cerr << "We failed to fuse: " << *MI;
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return false;
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}
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}
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//===----------------------------------------------------------------------===//
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