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Handle loading of 0x????0000 constants with a single instruction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22858 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey
2005-08-18 15:52:30 +00:00
parent cffc32b6e2
commit 3285aadce9
1 changed files with 9 additions and 5 deletions
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14
lib/Target/PowerPC/PPCISelPattern.cpp
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@@ -1738,12 +1738,16 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
case MVT::i32: case MVT::i32:
{ {
int v = (int)cast<ConstantSDNode>(N)->getSignExtended(); int v = (int)cast<ConstantSDNode>(N)->getSignExtended();
if (v < 32768 && v >= -32768) { unsigned Hi = Hi16(v);
BuildMI(BB, PPC::LI, 1, Result).addSImm(v); unsigned Lo = Lo16(v);
} else { if (Hi && Lo) {
Tmp1 = MakeIntReg(); Tmp1 = MakeIntReg();
BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(v >> 16); BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(Hi);
BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(v & 0xFFFF); BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(Lo);
} else if (Lo) {
BuildMI(BB, PPC::LI, 1, Result).addSImm(Lo);
} else {
BuildMI(BB, PPC::LIS, 1, Result).addSImm(Hi);
} }
} }
} }