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aco/ra: don't rename phi operands in get_reg_phi()

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Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Backport-to: *
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41018>
This commit is contained in:
Rhys Perry 2026-04-28 10:28:32 +01:00 • committed by Marge Bot
parent 638cefc8f2
commit 53cd74c284
2 changed files with 31 additions and 1 deletions
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2
src/amd/compiler/aco_register_allocation.cpp
View file

@ -2559,7 +2559,7 @@ get_reg_phi(ra_ctx& ctx, IDSet& live_in, RegisterFile& register_file,
{
std::vector<parallelcopy> parallelcopy;
PhysReg reg = get_reg(ctx, register_file, tmp, parallelcopy, phi);
update_renames(ctx, register_file, parallelcopy, phi);
update_renames(ctx, register_file, parallelcopy, ctx.phi_dummy);
/* process parallelcopy */
for (struct parallelcopy pc : parallelcopy) {

30
src/amd/compiler/tests/test_regalloc.cpp
View file

@ -1699,3 +1699,33 @@ BEGIN_TEST(regalloc.call.params.split_blocking_vecs)
finish_ra_test(ra_test_policy());
END_TEST
BEGIN_TEST(regalloc.move_phi_operand_for_def)
//>> p_startpgm
if (!setup_cs("", GFX10))
return;
program->dev.vgpr_limit = 4;
//! v2: %tmp0:v[1-2] = p_unit_test
Temp tmp0 = bld.pseudo(aco_opcode::p_unit_test, bld.def(v2, PhysReg(256 + 1)));
//! p_branch
bld.branch(aco_opcode::p_branch);
//! BB1
//! /* logical preds: BB0, / linear preds: BB0, / kind: uniform, top-level, */
bld.reset(program->create_and_insert_block());
program->blocks[1].linear_preds.push_back(0);
program->blocks[1].logical_preds.push_back(0);
program->blocks[1].kind |= block_kind_top_level;
//! v2: %tmp1:v[0-1] = p_phi %tmp0:v[1-2]
//! v2: %tmp0_2:v[2-3] = p_phi %tmp0:v[1-2]
Temp tmp1 = bld.pseudo(aco_opcode::p_phi, bld.def(v2), tmp0);
//! p_unit_test %tmp0_2:v[2-3], %tmp1:v[0-1]
bld.pseudo(aco_opcode::p_unit_test, tmp0, tmp1);
finish_ra_test(ra_test_policy());
END_TEST