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aco: copy-propagate constants through p_extract_vector/p_split_vector

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fossil-db (Navi, fp16 enabled):
Totals from 1 (0.00% of 127638) affected shaders:
CodeSize: 4388 -> 4392 (+0.09%)
VMEM: 465 -> 458 (-1.51%)
Copies: 54 -> 55 (+1.85%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5245>
This commit is contained in:
Rhys Perry
2020-05-18 19:42:40 +01:00
committed by Marge Bot
parent 3d6f67950d
commit 22d7122739
1 changed files with 25 additions and 6 deletions
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31
src/amd/compiler/aco_optimizer.cpp
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@@ -1034,8 +1034,20 @@ void label_instruction(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr)
break;
}
case aco_opcode::p_split_vector: {
if (!ctx.info[instr->operands[0].tempId()].is_vec())
ssa_info& info = ctx.info[instr->operands[0].tempId()];
if (info.is_constant_or_literal(32)) {
uint32_t val = info.val;
for (Definition def : instr->definitions) {
uint32_t mask = u_bit_consecutive(0, def.bytes() * 8u);
ctx.info[def.tempId()].set_constant(ctx.program->chip_class, val & mask);
val >>= def.bytes() * 8u;
}
break;
} else if (!info.is_vec()) {
break;
}
Instruction* vec = ctx.info[instr->operands[0].tempId()].instr;
unsigned split_offset = 0;
unsigned vec_offset = 0;
@@ -1060,13 +1072,20 @@ void label_instruction(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr)
break;
}
case aco_opcode::p_extract_vector: { /* mov */
if (!ctx.info[instr->operands[0].tempId()].is_vec())
break;
/* check if we index directly into a vector element */
Instruction* vec = ctx.info[instr->operands[0].tempId()].instr;
ssa_info& info = ctx.info[instr->operands[0].tempId()];
const unsigned index = instr->operands[1].constantValue();
const unsigned dst_offset = index * instr->definitions[0].bytes();
if (info.is_constant_or_literal(32)) {
uint32_t mask = u_bit_consecutive(0, instr->definitions[0].bytes() * 8u);
ctx.info[instr->definitions[0].tempId()].set_constant(ctx.program->chip_class, (info.val >> (dst_offset * 8u)) & mask);
break;
} else if (!info.is_vec()) {
break;
}
/* check if we index directly into a vector element */
Instruction* vec = info.instr;
unsigned offset = 0;
for (const Operand& op : vec->operands) {