fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-05 00:58:05 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

aco: optimize packed fneg

Browse source 
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6680>
This commit is contained in:
Daniel Schürmann 2020-09-11 16:20:21 +01:00 • committed by Marge Bot
parent e3790fc458
commit b03be30e07
1 changed files with 38 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
src/amd/compiler/aco_optimizer.cpp
View file

@ -2750,6 +2750,44 @@ void combine_vop3p(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr)
}
}
/* check for fneg modifiers */
if (instr_info.can_use_input_modifiers[(int)instr->opcode]) {
/* at this point, we only have 2-operand instructions */
assert(instr->operands.size() == 2);
for (unsigned i = 0; i < 2; i++) {
Operand& op = instr->operands[i];
if (!op.isTemp())
continue;
ssa_info& info = ctx.info[op.tempId()];
if (info.is_vop3p() && info.instr->opcode == aco_opcode::v_pk_mul_f16 &&
info.instr->operands[1].constantEquals(0xBC00)) {
Operand ops[2] = {instr->operands[!i], info.instr->operands[0]};
if (!check_vop3_operands(ctx, 2, ops))
continue;
VOP3P_instruction* fneg = static_cast<VOP3P_instruction*>(info.instr);
if (fneg->clamp)
continue;
instr->operands[i] = fneg->operands[0];
/* opsel_lo/hi is either 0 or 1:
* if 0 - pick selection from fneg->lo
* if 1 - pick selection from fneg->hi
*/
bool opsel_lo = vop3p->opsel_lo & (1 << i);
bool opsel_hi = vop3p->opsel_hi & (1 << i);
vop3p->neg_lo[i] ^= true ^ (opsel_lo ? fneg->neg_hi[0] : fneg->neg_lo[0]);
vop3p->neg_hi[i] ^= true ^ (opsel_hi ? fneg->neg_hi[0] : fneg->neg_lo[0]);
vop3p->opsel_lo ^= ((opsel_lo ? ~fneg->opsel_hi : fneg->opsel_lo) & 1) << i;
vop3p->opsel_hi ^= ((opsel_hi ? ~fneg->opsel_hi : fneg->opsel_lo) & 1) << i;
if (--ctx.uses[fneg->definitions[0].tempId()])
ctx.uses[fneg->operands[0].tempId()]++;
}
}
}
if (instr->opcode == aco_opcode::v_pk_add_f16) {
if (instr->definitions[0].isPrecise())
return;