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
diff --git a/lib/Target/PowerPC/PPCISelPattern.cpp b/lib/Target/PowerPC/PPCISelPattern.cpp
index da07b30..4d92e8a 100644
--- a/lib/Target/PowerPC/PPCISelPattern.cpp
+++ b/lib/Target/PowerPC/PPCISelPattern.cpp
@@ -1375,29 +1375,23 @@
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;