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nv50/ir: propagate indirect loads into instructions

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This way $r1 = $r0 + 4; c1[$r1] becomes c1[$r0+4].

On SM35:

total instructions in shared programs : 6206257 -> 6185058 (-0.34%)
total gprs used in shared programs    : 911045 -> 910722 (-0.04%)
total local used in shared programs   : 39072 -> 39072 (0.00%)

                local        gpr       inst      bytes
    helped           0         417        4195        4195
      hurt           0         280           0           0

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Ilia Mirkin 2015-12-04 15:21:11 -05:00
parent 31fde8faba
commit abd326e81b
1 changed files with 52 additions and 0 deletions
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52
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
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@ -265,6 +265,57 @@ LoadPropagation::visit(BasicBlock *bb)
// =============================================================================
class IndirectPropagation : public Pass
{
private:
virtual bool visit(BasicBlock *);
};
bool
IndirectPropagation::visit(BasicBlock *bb)
{
const Target *targ = prog->getTarget();
Instruction *next;
for (Instruction *i = bb->getEntry(); i; i = next) {
next = i->next;
for (int s = 0; i->srcExists(s); ++s) {
Instruction *insn;
ImmediateValue imm;
if (!i->src(s).isIndirect(0))
continue;
insn = i->getIndirect(s, 0)->getInsn();
if (!insn)
continue;
if (insn->op == OP_ADD && !isFloatType(insn->dType)) {
if (insn->src(0).getFile() != targ->nativeFile(FILE_ADDRESS) ||
!insn->src(1).getImmediate(imm))
continue;
i->setIndirect(s, 0, insn->getSrc(0));
i->setSrc(s, cloneShallow(func, i->getSrc(s)));
i->src(s).get()->reg.data.offset += imm.reg.data.u32;
} else if (insn->op == OP_SUB && !isFloatType(insn->dType)) {
if (insn->src(0).getFile() != targ->nativeFile(FILE_ADDRESS) ||
!insn->src(1).getImmediate(imm))
continue;
i->setIndirect(s, 0, insn->getSrc(0));
i->setSrc(s, cloneShallow(func, i->getSrc(s)));
i->src(s).get()->reg.data.offset -= imm.reg.data.u32;
} else if (insn->op == OP_MOV) {
if (!insn->src(0).getImmediate(imm))
continue;
i->setIndirect(s, 0, NULL);
i->setSrc(s, cloneShallow(func, i->getSrc(s)));
i->src(s).get()->reg.data.offset += imm.reg.data.u32;
}
}
}
return true;
}
// =============================================================================
// Evaluate constant expressions.
class ConstantFolding : public Pass
{
@ -3135,6 +3186,7 @@ Program::optimizeSSA(int level)
RUN_PASS(2, ModifierFolding, run); // before load propagation -> less checks
RUN_PASS(1, ConstantFolding, foldAll);
RUN_PASS(1, LoadPropagation, run);
RUN_PASS(1, IndirectPropagation, run);
RUN_PASS(2, MemoryOpt, run);
RUN_PASS(2, LocalCSE, run);
RUN_PASS(0, DeadCodeElim, buryAll);