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Simplify some code. It's not clear why the UDIV expanded sequence

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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
This commit is contained in:
Chris Lattner 2005-08-25 22:03:50 +00:00
parent 957fcfbd89
commit c70b4afce2
1 changed files with 7 additions and 13 deletions
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20
lib/Target/PowerPC/PPCISelPattern.cpp
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@ -1375,29 +1375,23 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
BuildMI(BB, PPC::ADDZE, 1, Tmp4).addReg(Tmp1);
BuildMI(BB, PPC::NEG, 1, Result).addReg(Tmp4);
return Result;
} else if (Tmp3) {
ExprMap.erase(N);
return SelectExpr(BuildSDIVSequence(N));
}
}
// fall thru
case ISD::UDIV:
// If this is a divide by constant, we can emit code using some magic
// constants to implement it as a multiply instead.
if (isIntImmediate(N.getOperand(1), Tmp3)) {
if (opcode == ISD::SDIV) {
if ((signed)Tmp3 < -1 || (signed)Tmp3 > 1) {
ExprMap.erase(N);
return SelectExpr(BuildSDIVSequence(N));
}
} else {
if ((signed)Tmp3 > 1) {
ExprMap.erase(N);
return SelectExpr(BuildUDIVSequence(N));
}
}
if (isIntImmediate(N.getOperand(1), Tmp3) && (signed)Tmp3 > 1) {
ExprMap.erase(N);
return SelectExpr(BuildUDIVSequence(N));
}
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
switch (DestType) {
default: assert(0 && "Unknown type to ISD::SDIV"); break;
default: assert(0 && "Unknown type to ISD::DIV"); break;
case MVT::i32: Opc = (ISD::UDIV == opcode) ? PPC::DIVWU : PPC::DIVW; break;
case MVT::f32: Opc = PPC::FDIVS; break;
case MVT::f64: Opc = PPC::FDIV; break;