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Compile CodeGen/X86/lea-3.ll:test2 to:
_test3: leaq (,%rdi,4), %rax orq %rdi, %rax ret instead of: _test2: movq %rdi, %rax shlq $2, %rax orq %rdi, %rax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35434 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -149,6 +149,19 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
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NewMI = BuildMI(get(X86::PSHUFDri), A).addReg(B).addImm(M);
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break;
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}
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case X86::SHL64ri: {
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assert(MI->getNumOperands() == 3 && "Unknown shift instruction!");
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// NOTE: LEA doesn't produce flags like shift does, but LLVM never uses
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// the flags produced by a shift yet, so this is safe.
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unsigned Dest = MI->getOperand(0).getReg();
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unsigned Src = MI->getOperand(1).getReg();
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unsigned ShAmt = MI->getOperand(2).getImm();
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if (ShAmt == 0 || ShAmt >= 4) return 0;
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NewMI = BuildMI(get(X86::LEA64r), Dest)
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.addReg(0).addImm(1 << ShAmt).addReg(Src).addImm(0);
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break;
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}
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case X86::SHL32ri: {
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assert(MI->getNumOperands() == 3 && "Unknown shift instruction!");
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// NOTE: LEA doesn't produce flags like shift does, but LLVM never uses
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