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aco: Fix dead instruction/index handling for try_insert_saveexec_out_of_loop

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The loop checking if exec is overwritten didn't check for NULL
instructions, and didn't fix up reg write indices after inserting
instructions.

Fixes: fcd94a8c ("aco: move try_optimize_branching_sequence() to postRA optimizations")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32746>
This commit is contained in:
Friedrich Vock
2024-12-15 17:15:30 +01:00
committed by Marge Bot
parent 67d74a04b9
commit 71392fff25
1 changed files with 20 additions and 9 deletions
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29
src/amd/compiler/aco_optimizer_postRA.cpp
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@@ -867,6 +867,8 @@ try_insert_saveexec_out_of_loop(pr_opt_ctx& ctx, Block* block, Definition saved_
/* Check if exec is written, or the copy's dst overwritten in the loop header. */
for (unsigned i = 0; i < saveexec_pos; i++) {
if (!block->instructions[i])
continue;
if (block->instructions[i]->writes_exec())
return false;
if (instr_overwrites(block->instructions[i].get(), saved_exec.physReg(), saved_exec.size()))
@@ -906,6 +908,19 @@ try_insert_saveexec_out_of_loop(pr_opt_ctx& ctx, Block* block, Definition saved_
return false;
}
void
fixup_reg_writes(pr_opt_ctx& ctx, unsigned start)
{
const unsigned current_idx = ctx.current_instr_idx;
for (unsigned i = start; i < current_idx; i++) {
ctx.current_instr_idx = i;
if (ctx.current_block->instructions[i])
save_reg_writes(ctx, ctx.current_block->instructions[i]);
}
ctx.current_instr_idx = current_idx;
}
bool
try_optimize_branching_sequence(pr_opt_ctx& ctx, aco_ptr<Instruction>& exec_copy)
{
@@ -1145,8 +1160,11 @@ try_optimize_branching_sequence(pr_opt_ctx& ctx, aco_ptr<Instruction>& exec_copy
*/
if (ctx.current_block->kind & block_kind_loop_header) {
if (try_insert_saveexec_out_of_loop(ctx, ctx.current_block, exec_copy_def,
exec_val_idx.instr))
exec_val_idx.instr)) {
/* We inserted something after the last phi, so fixup indices from the start. */
fixup_reg_writes(ctx, 0);
return true;
}
}
Instruction* copy = create_instruction(aco_opcode::p_parallelcopy, Format::PSEUDO, 1, 1);
copy->definitions[0] = exec_copy_def;
@@ -1155,14 +1173,7 @@ try_optimize_branching_sequence(pr_opt_ctx& ctx, aco_ptr<Instruction>& exec_copy
ctx.current_block->instructions.emplace(it, copy);
/* Fixup indices after inserting an instruction. */
const unsigned current_idx = ctx.current_instr_idx;
for (unsigned i = exec_val_idx.instr; i < current_idx; i++) {
ctx.current_instr_idx = i;
if (ctx.current_block->instructions[i])
save_reg_writes(ctx, ctx.current_block->instructions[i]);
}
ctx.current_instr_idx = current_idx;
fixup_reg_writes(ctx, exec_val_idx.instr);
return true;
}