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Cleanup initial-value constants in PPCCTRLoops
Because the initial-value constants had not been added to the list of instructions considered for DCE the resulting code had redundant constant-materialization instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177294 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -380,13 +380,13 @@ CountValue *PPCCTRLoops::getTripCount(MachineLoop *L,
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assert(InitialValue->isReg() && "Expecting register for init value");
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unsigned InitialValueReg = InitialValue->getReg();
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const MachineInstr *DefInstr = MRI->getVRegDef(InitialValueReg);
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MachineInstr *DefInstr = MRI->getVRegDef(InitialValueReg);
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// Here we need to look for an immediate load (an li or lis/ori pair).
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if (DefInstr && (DefInstr->getOpcode() == PPC::ORI8 ||
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DefInstr->getOpcode() == PPC::ORI)) {
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int64_t start = (short) DefInstr->getOperand(2).getImm();
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const MachineInstr *DefInstr2 =
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MachineInstr *DefInstr2 =
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MRI->getVRegDef(DefInstr->getOperand(0).getReg());
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if (DefInstr2 && (DefInstr2->getOpcode() == PPC::LIS8 ||
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DefInstr2->getOpcode() == PPC::LIS)) {
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@@ -399,6 +399,10 @@ CountValue *PPCCTRLoops::getTripCount(MachineLoop *L,
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if ((count % iv_value) != 0) {
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return 0;
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}
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OldInsts.push_back(DefInstr);
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OldInsts.push_back(DefInstr2);
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return new CountValue(count/iv_value);
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}
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} else if (DefInstr && (DefInstr->getOpcode() == PPC::LI8 ||
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@@ -409,6 +413,9 @@ CountValue *PPCCTRLoops::getTripCount(MachineLoop *L,
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if ((count % iv_value) != 0) {
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return 0;
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}
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OldInsts.push_back(DefInstr);
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return new CountValue(count/iv_value);
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} else if (iv_value == 1 || iv_value == -1) {
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// We can't determine a constant starting value.
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