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Simplify some code. It's not clear why the UDIV expanded sequence
doesn't work for large uint constants, but we'll keep the current behavior git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23061 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1375,29 +1375,23 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
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BuildMI(BB, PPC::ADDZE, 1, Tmp4).addReg(Tmp1);
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BuildMI(BB, PPC::NEG, 1, Result).addReg(Tmp4);
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return Result;
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} else if (Tmp3) {
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ExprMap.erase(N);
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return SelectExpr(BuildSDIVSequence(N));
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}
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}
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// fall thru
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case ISD::UDIV:
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// If this is a divide by constant, we can emit code using some magic
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// constants to implement it as a multiply instead.
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if (isIntImmediate(N.getOperand(1), Tmp3)) {
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if (opcode == ISD::SDIV) {
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if ((signed)Tmp3 < -1 || (signed)Tmp3 > 1) {
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ExprMap.erase(N);
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return SelectExpr(BuildSDIVSequence(N));
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}
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} else {
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if ((signed)Tmp3 > 1) {
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ExprMap.erase(N);
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return SelectExpr(BuildUDIVSequence(N));
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}
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}
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if (isIntImmediate(N.getOperand(1), Tmp3) && (signed)Tmp3 > 1) {
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ExprMap.erase(N);
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return SelectExpr(BuildUDIVSequence(N));
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}
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Tmp1 = SelectExpr(N.getOperand(0));
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Tmp2 = SelectExpr(N.getOperand(1));
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switch (DestType) {
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default: assert(0 && "Unknown type to ISD::SDIV"); break;
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default: assert(0 && "Unknown type to ISD::DIV"); break;
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case MVT::i32: Opc = (ISD::UDIV == opcode) ? PPC::DIVWU : PPC::DIVW; break;
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case MVT::f32: Opc = PPC::FDIVS; break;
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case MVT::f64: Opc = PPC::FDIV; break;
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