[PATCH] vect: Skip epilogue loops for dbgcnt check [PR96451]

Kewen.Lin linkw@linux.ibm.com
Wed Aug 5 07:48:06 GMT 2020


As the PR shows, commit r11-2453 exposed one issue that vectorizer
wants to vectorize the epilogue loop and leaves the if-cvt body there,
but later dbgcnt check disables it, the left scalar mask_store
statement cause ICE.

As Richard pointed out in that PR, the dbgcnt is to count original
scalar loops, so this fix is to make it skip the epilogue loops.

Testing just launched, is it OK for trunk if everthing goes well?



	* tree-vectorizer.c (try_vectorize_loop_1): Skip the epilogue loops
	for dbgcnt check.

diff --git a/gcc/tree-vectorizer.c b/gcc/tree-vectorizer.c
index 26a184696aa..1e9f46148ca 100644
--- a/gcc/tree-vectorizer.c
+++ b/gcc/tree-vectorizer.c
@@ -1066,7 +1066,8 @@ try_vectorize_loop_1 (hash_table<simduid_to_vf> *&simduid_to_vf_htab,
       return ret;

-  if (!dbg_cnt (vect_loop))
+  /* Only count the original scalar loops.  */
+  if (!LOOP_VINFO_EPILOGUE_P (loop_vinfo) && !dbg_cnt (vect_loop))
       /* Free existing information if loop is analyzed with some
	 assumptions.  */

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