[PATCH] more SCEV cache clearing

[PATCH] more SCEV cache clearing

[Richard Biener]

This fixes two more places, in loop interchange and in the
vectorizer where the SCEV verifier sees stale entries.

Boostrapped/tested on x86_64-unknown-linux-gnu, pushed.

2020-07-29  Richard Biener  <rguenther@suse.de>

	* tree-vectorizer.c (vectorize_loops): Reset the SCEV
	cache if we removed any SIMD UID SSA defs.
	* gimple-loop-interchange.cc (pass_linterchange::execute):
	Reset the scev cache if we interchanged a loop.
---
 gcc/gimple-loop-interchange.cc | 2 ++
 gcc/tree-vectorizer.c          | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/gcc/gimple-loop-interchange.cc b/gcc/gimple-loop-interchange.cc
index 2379848808f..1656004ecf0 100644
--- a/gcc/gimple-loop-interchange.cc
+++ b/gcc/gimple-loop-interchange.cc
@@ -2084,6 +2084,8 @@ pass_linterchange::execute (function *fun)
       loop_nest.release ();
     }
 
+  if (changed_p)
+    scev_reset ();
   return changed_p ? (TODO_update_ssa_only_virtuals) : 0;
 }
 
diff --git a/gcc/tree-vectorizer.c b/gcc/tree-vectorizer.c
index 26a184696aa..2a60d37bb87 100644
--- a/gcc/tree-vectorizer.c
+++ b/gcc/tree-vectorizer.c
@@ -1283,7 +1283,11 @@ vectorize_loops (void)
 
   /* Fold IFN_GOMP_SIMD_{VF,LANE,LAST_LANE,ORDERED_{START,END}} builtins.  */
   if (cfun->has_simduid_loops)
-    adjust_simduid_builtins (simduid_to_vf_htab);
+    {
+      adjust_simduid_builtins (simduid_to_vf_htab);
+      /* Avoid stale SCEV cache entries for the SIMD_LANE defs.  */
+      scev_reset ();
+    }
 
   /* Shrink any "omp array simd" temporary arrays to the
      actual vectorization factors.  */
-- 
2.26.2