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intel/brw: Refactor code to commute immediates into legal positions

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This will let us reuse this in a new pass shortly.

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29624>
This commit is contained in:
Kenneth Graunke
2024-04-09 22:31:01 -07:00
parent d45da713e7
commit 3da444b79e
1 changed files with 25 additions and 20 deletions
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45
src/intel/compiler/brw_fs_copy_propagation.cpp
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@@ -1281,6 +1281,30 @@ can_propagate_from(fs_inst *inst)
is_identity_payload(FIXED_GRF, inst);
}
static void
commute_immediates(fs_inst *inst)
{
/* ADD3 can only have the immediate as src0. */
if (inst->opcode == BRW_OPCODE_ADD3) {
if (inst->src[2].file == IMM) {
const auto src0 = inst->src[0];
inst->src[0] = inst->src[2];
inst->src[2] = src0;
}
}
/* If only one of the sources of a 2-source, commutative instruction (e.g.,
* AND) is immediate, it must be src1. If both are immediate, opt_algebraic
* should fold it away.
*/
if (inst->sources == 2 && inst->is_commutative() &&
inst->src[0].file == IMM && inst->src[1].file != IMM) {
const auto src1 = inst->src[1];
inst->src[1] = inst->src[0];
inst->src[0] = src1;
}
}
/* Walks a basic block and does copy propagation on it using the acp
* list.
*/
@@ -1319,26 +1343,7 @@ opt_copy_propagation_local(const brw_compiler *compiler, linear_ctx *lin_ctx,
if (instruction_progress) {
progress = true;
/* ADD3 can only have the immediate as src0. */
if (inst->opcode == BRW_OPCODE_ADD3) {
if (inst->src[2].file == IMM) {
const auto src0 = inst->src[0];
inst->src[0] = inst->src[2];
inst->src[2] = src0;
}
}
/* If only one of the sources of a 2-source, commutative instruction (e.g.,
* AND) is immediate, it must be src1. If both are immediate, opt_algebraic
* should fold it away.
*/
if (inst->sources == 2 && inst->is_commutative() &&
inst->src[0].file == IMM && inst->src[1].file != IMM) {
const auto src1 = inst->src[1];
inst->src[1] = inst->src[0];
inst->src[0] = src1;
}
commute_immediates(inst);
}
/* kill the destination from the ACP */