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nv50/ir: optimize near power-of-twos into shladd

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total instructions in shared programs : 5819319 -> 5796385 (-0.39%)
total gprs used in shared programs    : 670571 -> 670103 (-0.07%)
total shared used in shared programs  : 548832 -> 548832 (0.00%)
total local used in shared programs   : 21164 -> 21164 (0.00%)

                local     shared        gpr       inst      bytes
    helped           0           0         318        1758        1758
      hurt           0           0          63           0           0

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
This commit is contained in:
Rhys Perry 2018-08-18 15:06:01 +01:00
parent 2f52925f5c
commit 400a4eb964
1 changed files with 27 additions and 0 deletions
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27
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
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@ -958,6 +958,9 @@ ConstantFolding::opnd3(Instruction *i, ImmediateValue &imm2)
bool
ConstantFolding::createMul(DataType ty, Value *def, Value *a, int64_t b, Value *c)
{
const Target *target = prog->getTarget();
int64_t absB = llabs(b);
//a * (2^shl) -> a << shl
if (b >= 0 && util_is_power_of_two_or_zero64(b)) {
int shl = util_logbase2_64(b);
@ -970,6 +973,30 @@ ConstantFolding::createMul(DataType ty, Value *def, Value *a, int64_t b, Value *
return true;
}
//a * (2^shl + 1) -> a << shl + a
//a * -(2^shl + 1) -> -a << shl + a
//a * (2^shl - 1) -> a << shl - a
//a * -(2^shl - 1) -> -a << shl - a
if (typeSizeof(ty) == 4 &&
(util_is_power_of_two_or_zero64(absB - 1) ||
util_is_power_of_two_or_zero64(absB + 1)) &&
target->isOpSupported(OP_SHLADD, TYPE_U32)) {
bool subA = util_is_power_of_two_or_zero64(absB + 1);
int shl = subA ? util_logbase2_64(absB + 1) : util_logbase2_64(absB - 1);
Value *res = c ? bld.getSSA() : def;
Instruction *insn = bld.mkOp3(OP_SHLADD, TYPE_U32, res, a, bld.mkImm(shl), a);
if (b < 0)
insn->src(0).mod = Modifier(NV50_IR_MOD_NEG);
if (subA)
insn->src(2).mod = Modifier(NV50_IR_MOD_NEG);
if (c)
bld.mkOp2(OP_ADD, TYPE_U32, def, res, c);
return true;
}
return false;
}