* [PATCH] tree-optimization/106881 - fix simple_control_dep_chain part
@ 2022-09-09 9:47 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2022-09-09 9:47 UTC (permalink / raw)
To: gcc-patches
This adjusts simple_control_dep_chain in the same way I adjusted
compute_control_dep_chain_pdom to avoid adding fallthru edges to
the predicate chain.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
PR tree-optimization/106881
* gimple-predicate-analysis.cc (simple_control_dep_chain):
Add only non-fallthru edges and avoid the same set of edges
as compute_control_dep_chain_pdom does.
---
gcc/gimple-predicate-analysis.cc | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/gcc/gimple-predicate-analysis.cc b/gcc/gimple-predicate-analysis.cc
index 910ab97a29e..bc9ed847267 100644
--- a/gcc/gimple-predicate-analysis.cc
+++ b/gcc/gimple-predicate-analysis.cc
@@ -926,10 +926,14 @@ simple_control_dep_chain (vec<edge>& chain, basic_block from, basic_block to)
{
basic_block dest = src;
src = get_immediate_dominator (CDI_DOMINATORS, src);
- edge pred_e;
- if (single_pred_p (dest)
- && (pred_e = find_edge (src, dest)))
- chain.safe_push (pred_e);
+ if (single_pred_p (dest))
+ {
+ edge pred_e = single_pred_edge (dest);
+ gcc_assert (pred_e->src == src);
+ if (!(pred_e->flags & ((EDGE_FAKE | EDGE_ABNORMAL | EDGE_DFS_BACK)))
+ && !single_succ_p (src))
+ chain.safe_push (pred_e);
+ }
}
}
--
2.35.3
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