us to load and store vectors directly at a pointer (offset of zero) by
using r0 as the base register. This also requires some asm printer work
to satisfy the darwin assembler.
For
void %foo(<4 x float> * %a) {
entry:
%tmp1 = load <4 x float> * %a;
%tmp2 = add <4 x float> %tmp1, %tmp1
store <4 x float> %tmp2, <4 x float> *%a
ret void
}
We now produce:
_foo:
lvx v0, 0, r3
vaddfp v0, v0, v0
stvx v0, 0, r3
blr
Instead of:
_foo:
li r2, 0
lvx v0, r2, r3
vaddfp v0, v0, v0
stvx v0, r2, r3
blr
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24872
91177308-0d34-0410-b5e6-
96231b3b80d8
O << ')';
}
void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
- printOperand(MI, OpNo);
+ // When used as the base register, r0 reads constant zero rather than
+ // the value contained in the register. For this reason, the darwin
+ // assembler requires that we print r0 as 0 (no r) when used as the base.
+ const MachineOperand &MO = MI->getOperand(OpNo);
+ if (MO.getReg() == PPC::R0)
+ O << '0';
+ else
+ O << TM.getRegisterInfo()->get(MO.getReg()).Name;
O << ", ";
printOperand(MI, OpNo+1);
}
return true;
}
- // FIXME: This should be a CopyFromReg R0 rather than a load of 0.
- Base = CurDAG->getTargetNode(PPC::LI, MVT::i32, getI32Imm(0));
+ Base = CurDAG->getRegister(PPC::R0, MVT::i32);
Index = Select(N);
return true;
}
return true;
}
- // FIXME: This should be a CopyFromReg R0 rather than a load of 0.
- Base = CurDAG->getTargetNode(PPC::LI, MVT::i32, getI32Imm(0));
+ Base = CurDAG->getRegister(PPC::R0, MVT::i32);
Index = Select(N);
return true;
}