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aco: combine a ^ ~b and ~(a ^ b) to v_xnor_b32

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Foz-DB Navi21:
Totals from 13 (0.01% of 134913) affected shaders:
CodeSize: 225432 -> 225180 (-0.11%)
Instrs: 41973 -> 41908 (-0.15%)
Latency: 297464 -> 297326 (-0.05%)
InvThroughput: 82536 -> 82467 (-0.08%)
Copies: 2452 -> 2440 (-0.49%)

Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21410>
This commit is contained in:
Georg Lehmann 2023-02-08 14:18:15 +01:00 • committed by Marge Bot
parent dea36fce6a
commit 3bd5b583f9
1 changed files with 53 additions and 0 deletions
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53
src/amd/compiler/aco_optimizer.cpp
View file

@ -2066,6 +2066,7 @@ label_instruction(opt_ctx& ctx, aco_ptr<Instruction>& instr)
case aco_opcode::v_bcnt_u32_b32:
case aco_opcode::v_and_b32:
case aco_opcode::v_xor_b32:
case aco_opcode::v_not_b32:
ctx.info[instr->definitions[0].tempId()].set_usedef(instr.get());
break;
case aco_opcode::v_min_f32:
@ -2812,6 +2813,55 @@ combine_add_or_then_and_lshl(opt_ctx& ctx, aco_ptr<Instruction>& instr)
return false;
}
/* v_xor(a, s_not(b)) -> v_xnor(a, b)
* v_xor(a, v_not(b)) -> v_xnor(a, b)
*/
bool
combine_xor_not(opt_ctx& ctx, aco_ptr<Instruction>& instr)
{
if (instr->usesModifiers())
return false;
for (unsigned i = 0; i < 2; i++) {
Instruction* op_instr = follow_operand(ctx, instr->operands[i], true);
if (!op_instr ||
(op_instr->opcode != aco_opcode::v_not_b32 &&
op_instr->opcode != aco_opcode::s_not_b32) ||
op_instr->usesModifiers() || op_instr->operands[0].isLiteral())
continue;
instr->opcode = aco_opcode::v_xnor_b32;
instr->operands[i] = copy_operand(ctx, op_instr->operands[0]);
decrease_uses(ctx, op_instr);
if (instr->operands[0].isOfType(RegType::vgpr))
std::swap(instr->operands[0], instr->operands[1]);
if (!instr->operands[1].isOfType(RegType::vgpr))
to_VOP3(ctx, instr);
return true;
}
return false;
}
/* v_not(v_xor(a, b)) -> v_xnor(a, b) */
bool
combine_not_xor(opt_ctx& ctx, aco_ptr<Instruction>& instr)
{
if (instr->usesModifiers())
return false;
Instruction* op_instr = follow_operand(ctx, instr->operands[0]);
if (!op_instr || op_instr->opcode != aco_opcode::v_xor_b32 || op_instr->isSDWA())
return false;
ctx.uses[instr->operands[0].tempId()]--;
std::swap(instr->definitions[0], op_instr->definitions[0]);
op_instr->opcode = aco_opcode::v_xnor_b32;
return true;
}
bool
combine_minmax(opt_ctx& ctx, aco_ptr<Instruction>& instr, aco_opcode opposite, aco_opcode op3src,
aco_opcode minmax)
@ -4467,7 +4517,10 @@ combine_instruction(opt_ctx& ctx, aco_ptr<Instruction>& instr)
1 | 2)) {
} else if (combine_three_valu_op(ctx, instr, aco_opcode::s_xor_b32, aco_opcode::v_xor3_b32,
"012", 1 | 2)) {
} else if (combine_xor_not(ctx, instr)) {
}
} else if (instr->opcode == aco_opcode::v_not_b32 && ctx.program->gfx_level >= GFX10) {
combine_not_xor(ctx, instr);
} else if (instr->opcode == aco_opcode::v_add_u16) {
combine_three_valu_op(
ctx, instr, aco_opcode::v_mul_lo_u16,