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aco/ra: don't tie definition when the operand is in a preserved reg

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Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40225>
This commit is contained in:
Georg Lehmann 2026-03-09 18:27:51 +01:00 • committed by Marge Bot
parent 444eb3dce5
commit d7348ea501
1 changed files with 3 additions and 3 deletions
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6
src/amd/compiler/aco_register_allocation.cpp
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@ -3533,6 +3533,8 @@ affinity_blocks_tied_def0(const ra_ctx& ctx, const RegisterFile& register_file,
} else if (ctx.assignments[def_id].precolor_affinity) {
if (ctx.assignments[def_id].reg != instr->operands[op_idx].physReg())
return true;
} else if (BITSET_TEST(ctx.preserved, instr->operands[op_idx].physReg())) {
return true;
}
return false;
}
@ -4250,9 +4252,7 @@ register_allocation(Program* program, ra_test_policy policy)
* different location due to affinity, but that gets complicated very quickly. */
definition->setFixed(instr->operands[2].physReg());
} else if (dot2_can_use_vopd(ctx, instr.get()) &&
!affinity_blocks_tied_def0(ctx, register_file, instr.get(), 2) &&
get_reg_specified(ctx, register_file, definition->regClass(), instr,
instr->operands[2].physReg(), -1)) {
!affinity_blocks_tied_def0(ctx, register_file, instr.get(), 2)) {
definition->setFixed(instr->operands[2].physReg());
}