Mesa (staging/22.0): aco: fix spilling of phis without temp operands
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Wed Jun 1 20:58:21 UTC 2022
Module: Mesa
Branch: staging/22.0
Commit: 4a846d12d1ce9a882d95528bdaa51ca09b805607
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=4a846d12d1ce9a882d95528bdaa51ca09b805607
Author: Daniel Schürmann <daniel at schuermann.dev>
Date: Wed May 25 16:12:19 2022 +0200
aco: fix spilling of phis without temp operands
These were spilled unconditionally.
Cc: mesa-stable
Reviewed-by: Rhys Perry <pendingchaos02 at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16708>
(cherry picked from commit 8e41c66639f20671957ffd8cacd7c7328920848e)
---
.pick_status.json | 2 +-
src/amd/compiler/aco_spill.cpp | 23 ++++++++++-------------
2 files changed, 11 insertions(+), 14 deletions(-)
diff --git a/.pick_status.json b/.pick_status.json
index 8d8bea78190..6f4434ec550 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -228,7 +228,7 @@
"description": "aco: fix spilling of phis without temp operands",
"nominated": true,
"nomination_type": 0,
- "resolution": 0,
+ "resolution": 1,
"because_sha": null
},
{
diff --git a/src/amd/compiler/aco_spill.cpp b/src/amd/compiler/aco_spill.cpp
index ce1d830920b..cfb74e84a0b 100644
--- a/src/amd/compiler/aco_spill.cpp
+++ b/src/amd/compiler/aco_spill.cpp
@@ -697,25 +697,22 @@ init_live_in_vars(spill_ctx& ctx, Block* block, unsigned block_idx)
std::vector<unsigned>& preds =
phi->opcode == aco_opcode::p_phi ? block->logical_preds : block->linear_preds;
- bool spill = true;
-
+ bool is_all_spilled = true;
for (unsigned i = 0; i < phi->operands.size(); i++) {
- /* non-temp operands can increase the register pressure */
- if (!phi->operands[i].isTemp()) {
- partial_spills.insert(phi->definitions[0].getTemp());
+ if (phi->operands[i].isUndefined())
continue;
- }
-
- if (!ctx.spills_exit[preds[i]].count(phi->operands[i].getTemp()))
- spill = false;
- else
- partial_spills.insert(phi->definitions[0].getTemp());
+ is_all_spilled &= phi->operands[i].isTemp() &&
+ ctx.spills_exit[preds[i]].count(phi->operands[i].getTemp());
}
- if (spill) {
+
+ if (is_all_spilled) {
+ /* The phi is spilled at all predecessors. Keep it spilled. */
ctx.spills_entry[block_idx][phi->definitions[0].getTemp()] =
ctx.allocate_spill_id(phi->definitions[0].regClass());
- partial_spills.erase(phi->definitions[0].getTemp());
spilled_registers += phi->definitions[0].getTemp();
+ } else {
+ /* Phis might increase the register pressure. */
+ partial_spills.insert(phi->definitions[0].getTemp());
}
}
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