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

llvm-svn: 22858
This commit is contained in:
Jim Laskey 2005-08-18 15:52:30 +00:00
parent b3821a3943
commit 32d4c85278
1 changed files with 9 additions and 5 deletions
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14
llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
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@ -1738,12 +1738,16 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
case MVT::i32:
{
int v = (int)cast<ConstantSDNode>(N)->getSignExtended();
if (v < 32768 && v >= -32768) {
BuildMI(BB, PPC::LI, 1, Result).addSImm(v);
} else {
unsigned Hi = Hi16(v);
unsigned Lo = Lo16(v);
if (Hi && Lo) {
Tmp1 = MakeIntReg();
BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(v >> 16);
BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(v & 0xFFFF);
BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(Hi);
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);
}
}
}