fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-31 09:50:08 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

aco: fix detecting sgprs read by SMEM hazard

Browse source 
s_waitcnt_lgkmcnt is SOPK, not SOPP and there are other SOPK instructions
that don't mitigate the hazard.

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26163>
This commit is contained in:
Georg Lehmann 2023-11-11 10:53:31 +01:00 • committed by Marge Bot
parent e49c413a86
commit 2f4e53b22a
1 changed files with 10 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
src/amd/compiler/aco_insert_NOPs.cpp
View file

@ -1026,20 +1026,18 @@ handle_instruction_gfx10(State& state, NOP_ctx_gfx10& ctx, aco_ptr<Instruction>&
bld.sop1(aco_opcode::s_mov_b32, Definition(sgpr_null, s1), Operand::zero());
}
} else if (instr->isSALU()) {
if (instr->format != Format::SOPP) {
/* Reducing lgkmcnt count to 0 always mitigates the hazard. */
if (instr->opcode == aco_opcode::s_waitcnt_lgkmcnt) {
const SOPK_instruction& sopk = instr->sopk();
if (sopk.imm == 0 && sopk.operands[0].physReg() == sgpr_null)
ctx.sgprs_read_by_SMEM.reset();
} else if (instr->opcode == aco_opcode::s_waitcnt) {
wait_imm imm(state.program->gfx_level, instr->sopp().imm);
if (imm.lgkm == 0)
ctx.sgprs_read_by_SMEM.reset();
} else if (instr->format != Format::SOPP && instr->definitions.size()) {
/* SALU can mitigate the hazard */
ctx.sgprs_read_by_SMEM.reset();
} else {
/* Reducing lgkmcnt count to 0 always mitigates the hazard. */
const SOPP_instruction& sopp = instr->sopp();
if (sopp.opcode == aco_opcode::s_waitcnt_lgkmcnt) {
if (sopp.imm == 0 && sopp.operands[0].physReg() == sgpr_null)
ctx.sgprs_read_by_SMEM.reset();
} else if (sopp.opcode == aco_opcode::s_waitcnt) {
wait_imm imm(state.program->gfx_level, instr->sopp().imm);
if (imm.lgkm == 0)
ctx.sgprs_read_by_SMEM.reset();
}
}
}