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aco/ra: Handle linear VGPRs allocated by p_startpgm

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38281>
This commit is contained in:
Natalie Vock 2025-11-26 14:39:02 +01:00 • committed by Marge Bot
parent 761efe9163
commit 6b2e766617
1 changed files with 9 additions and 5 deletions
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14
src/amd/compiler/aco_register_allocation.cpp
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@ -1854,12 +1854,14 @@ compact_linear_vgprs(ra_ctx& ctx, const RegisterFile& reg_file,
*/
PhysReg
alloc_linear_vgpr(ra_ctx& ctx, const RegisterFile& reg_file, aco_ptr<Instruction>& instr,
Definition& def,
std::vector<parallelcopy>& parallelcopies)
{
assert(instr->opcode == aco_opcode::p_start_linear_vgpr);
assert(instr->definitions.size() == 1 && instr->definitions[0].bytes() % 4 == 0);
assert(instr->opcode == aco_opcode::p_start_linear_vgpr || instr->opcode == aco_opcode::p_startpgm);
if (instr->opcode == aco_opcode::p_start_linear_vgpr)
assert(instr->definitions.size() == 1 && instr->definitions[0].bytes() % 4 == 0);
RegClass rc = instr->definitions[0].regClass();
RegClass rc = def.regClass();
/* Try to choose an unused space in the linear VGPR bounds. */
for (unsigned i = rc.size(); i <= ctx.num_linear_vgprs; i++) {
@ -3908,9 +3910,11 @@ register_allocation(Program* program, ra_test_policy policy)
continue;
/* find free reg */
if (instr->opcode == aco_opcode::p_start_linear_vgpr) {
if (instr->opcode == aco_opcode::p_start_linear_vgpr ||
(instr->opcode == aco_opcode::p_startpgm &&
definition->regClass().is_linear_vgpr())) {
/* Allocation of linear VGPRs is special. */
definition->setFixed(alloc_linear_vgpr(ctx, register_file, instr, parallelcopy));
definition->setFixed(alloc_linear_vgpr(ctx, register_file, instr, *definition, parallelcopy));
update_renames(ctx, register_file, parallelcopy, instr);
} else if (instr->opcode == aco_opcode::p_split_vector) {
PhysReg reg = instr->operands[0].physReg();