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aco/sched_ilp: only remove WaW/WaR for inter clause dependencies

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Direct RaW shouldn't be removed, because the clause is split by a wait anyway.

Foz-DB Navi21:
Totals from 52 (0.07% of 79206) affected shaders:
Instrs: 1603523 -> 1603485 (-0.00%); split: -0.00%, +0.00%
CodeSize: 8223048 -> 8222788 (-0.00%)
Latency: 9741674 -> 9738884 (-0.03%); split: -0.03%, +0.00%
InvThroughput: 2322621 -> 2322010 (-0.03%); split: -0.03%, +0.00%
SClause: 31325 -> 31320 (-0.02%); split: -0.02%, +0.01%

Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Reviewed-by: Daniel Schürmann <None>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33111>
This commit is contained in:
Georg Lehmann 2025-01-23 10:35:51 +01:00 • committed by Marge Bot
parent 4b332afb32
commit 45ccd6487f
1 changed files with 8 additions and 3 deletions
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11
src/amd/compiler/aco_scheduler_ilp.cpp
View file

@ -388,12 +388,13 @@ add_entry(SchedILPContext& ctx, Instruction* const instr, const uint32_t idx)
}
}
mask_t write_dep_mask = 0;
for (const Definition& def : instr->definitions) {
for (unsigned i = 0; i < def.size(); i++) {
RegisterInfo& reg_info = ctx.regs[def.physReg().reg() + i];
/* Add all previous register reads and writes to the dependencies. */
entry.dependency_mask |= reg_info.read_mask;
write_dep_mask |= reg_info.read_mask;
reg_info.read_mask = mask;
/* This register write is a direct dependency for all following reads. */
@ -423,19 +424,23 @@ add_entry(SchedILPContext& ctx, Instruction* const instr, const uint32_t idx)
if (!is_memory_instr(instr) || instr->definitions.empty() ||
get_sync_info(instr).semantics & semantic_volatile || ctx.is_vopd) {
/* Add all previous instructions as dependencies. */
entry.dependency_mask = ctx.active_mask;
entry.dependency_mask = ctx.active_mask & ~ctx.non_reorder_mask;
}
/* Remove non-reorderable instructions from dependencies, since WaR dependencies can interfere
* with clause formation. This should be fine, since these are always scheduled in-order and
* any cases that are actually a concern for clause formation are added as transitive
* dependencies. */
entry.dependency_mask &= ~ctx.non_reorder_mask;
write_dep_mask &= ~ctx.non_reorder_mask;
/* Ignore RaW for VINTERP. */
if (instr->isVINTRP())
entry.dependency_mask &= ~ctx.non_reorder_mask;
ctx.potential_partial_clause = true;
} else if (ctx.last_non_reorderable != UINT8_MAX) {
ctx.potential_partial_clause = false;
}
entry.dependency_mask |= write_dep_mask;
entry.dependency_mask &= ~mask;
for (unsigned i = 0; i < num_nodes; i++) {