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More optimal solution for loading constants. 

llvm-svn: 22870
This commit is contained in:
Jim Laskey 2005-08-18 18:58:23 +00:00
parent 015d73996d
commit 18b9b8df86
1 changed files with 11 additions and 9 deletions
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20
llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
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@ -1719,16 +1719,18 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
assert(N.getValueType() == MVT::i32 &&
"Only i32 constants are legal on this target!");
unsigned v = (unsigned)cast<ConstantSDNode>(N)->getValue();
unsigned Hi = HA16(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(Lo);
} else if (Hi) {
BuildMI(BB, PPC::LIS, 1, Result).addSImm(v >> 16);
if (isInt16(v)) {
BuildMI(BB, PPC::LI, 1, Result).addSImm(Lo16(v));
} else {
BuildMI(BB, PPC::LI, 1, Result).addSImm(Lo);
unsigned Hi = Hi16(v);
unsigned Lo = Lo16(v);
if (Lo) {
Tmp1 = MakeIntReg();
BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(Hi);
BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(Lo);
} else {
BuildMI(BB, PPC::LIS, 1, Result).addSImm(Hi);
}
}
return Result;
}