* [PATCH] Loop distribution fix for SCC detection
@ 2023-11-14 11:59 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2023-11-14 11:59 UTC (permalink / raw)
To: gcc-patches
The following adjusts data_dep_in_cycle_p to properly consider the
whole loop nest when looking for data dep cycles and exempting
zero-distance DDRs instead of just the outermost loop.
Bootstrap & regtest running on x86_64-unknown-linux-gnu.
* tree-loop-distribution.cc (loop_distribution::data_dep_in_cycle_p):
Consider all loops in the nest when looking for
lambda_vector_zerop.
---
gcc/tree-loop-distribution.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/tree-loop-distribution.cc b/gcc/tree-loop-distribution.cc
index 8e92af61c57..5ededd97c3d 100644
--- a/gcc/tree-loop-distribution.cc
+++ b/gcc/tree-loop-distribution.cc
@@ -1440,7 +1440,7 @@ loop_distribution::data_dep_in_cycle_p (struct graph *rdg,
else if (DDR_NUM_DIST_VECTS (ddr) > 1)
return true;
else if (DDR_REVERSED_P (ddr)
- || lambda_vector_zerop (DDR_DIST_VECT (ddr, 0), 1))
+ || lambda_vector_zerop (DDR_DIST_VECT (ddr, 0), DDR_NB_LOOPS (ddr)))
return false;
return true;
--
2.35.3
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