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nv50/ir: optimize mad/fma with third argument 0 to mul

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Very modest effect, but it's clearly the right thing to do.

total instructions in shared programs : 6131491 -> 6131398 (-0.00%)
total gprs used in shared programs    : 910157 -> 910131 (-0.00%)
total local used in shared programs   : 15328 -> 15328 (0.00%)

                local        gpr       inst      bytes
    helped           0          55          85          85
      hurt           0          26          20          20

Signed-off-by: Karol Herbst <nouveau@karolherbst.de>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Karol Herbst 2016-01-27 18:25:08 +01:00 • committed by Ilia Mirkin
parent 3aa681449e
commit 29d09f8747
1 changed files with 21 additions and 0 deletions
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21
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
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@ -336,6 +336,7 @@ private:
void expr(Instruction *, ImmediateValue&, ImmediateValue&);
void expr(Instruction *, ImmediateValue&, ImmediateValue&, ImmediateValue&);
void opnd(Instruction *, ImmediateValue&, int s);
void opnd3(Instruction *, ImmediateValue&);
void unary(Instruction *, const ImmediateValue&);
@ -388,6 +389,8 @@ ConstantFolding::visit(BasicBlock *bb)
else
if (i->srcExists(1) && i->src(1).getImmediate(src1))
opnd(i, src1, 1);
if (i->srcExists(2) && i->src(2).getImmediate(src2))
opnd3(i, src2);
}
return true;
}
@ -872,6 +875,24 @@ ConstantFolding::tryCollapseChainedMULs(Instruction *mul2,
}
}
void
ConstantFolding::opnd3(Instruction *i, ImmediateValue &imm2)
{
switch (i->op) {
case OP_MAD:
case OP_FMA:
if (imm2.isInteger(0)) {
i->op = OP_MUL;
i->setSrc(2, NULL);
foldCount++;
return;
}
break;
default:
return;
}
}
void
ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
{