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Teach the addressing mode stuff to fold "%lo" into 'ri' addressing modes,

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allowing us to compile this:

to this:

%G1 = external global int
%G2 = external global int
void %test() {
        %X = load int* %G1
        store int %X, int* %G2
        ret void
}

test:
        save -96, %sp, %sp
        sethi %hi(G1), %l0
        ld [%l0+%lo(G1)], %l0
        sethi %hi(G2), %l1
        st %l0, [%l1+%lo(G2)]
        restore %g0, %g0, %g0
        retl
        nop

instead of this:

test:
        save -96, %sp, %sp
        sethi %hi(G1), %l0
        or %g0, %lo(G1), %l1
        ld [%l1+%l0], %l0
        sethi %hi(G2), %l1
        or %g0, %lo(G2), %l2
        st %l0, [%l2+%l1]
        restore %g0, %g0, %g0
        retl
        nop


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24812 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-12-18 02:27:00 +00:00
parent e357246c6b
commit e1389ad43a
4 changed files with 40 additions and 2 deletions
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8
lib/Target/Sparc/SparcAsmPrinter.cpp
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@@ -186,7 +186,13 @@ void SparcV8AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
void SparcV8AsmPrinter::printMemOperand(const MachineInstr *MI, int opNum) {
printOperand(MI, opNum);
O << "+";
printOperand(MI, opNum+1);
if (MI->getOperand(opNum+1).getType() == MachineOperand::MO_GlobalAddress) {
O << "%lo(";
printOperand(MI, opNum+1);
O << ")";
} else {
printOperand(MI, opNum+1);
}
}