From: Richard Biener <rguenther@suse.de>
Date: Tue, 26 Jun 2018 06:42:46 +0000 (+0000)
Subject: re PR tree-optimization/86287 (AddressSanitizer: heap-use-after-free on bootstrap... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9ae91886f6a59fbcba0559299e170ee82fa592cb;p=gcc.git

re PR tree-optimization/86287 (AddressSanitizer: heap-use-after-free on bootstrap with -O3)

2018-06-26  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/86287
	PR bootstrap/86316
	* tree-vect-loop.c (vect_transform_loop_stmt): Fix read-after-free.
	(vect_analyze_loop): Initialize n_stmts.

From-SVN: r262132
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 342c69b1240..ec68212bc0a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-06-26  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/86287
+	PR bootstrap/86316
+	* tree-vect-loop.c (vect_transform_loop_stmt): Fix read-after-free.
+	(vect_analyze_loop): Initialize n_stmts.
+
 2018-06-26  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/86271
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index dacc8811636..615b6bb101f 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -2315,7 +2315,7 @@ vect_analyze_loop (struct loop *loop, loop_vec_info orig_loop_vinfo,
       return NULL;
     }
 
-  unsigned n_stmts;
+  unsigned n_stmts = 0;
   poly_uint64 autodetected_vector_size = 0;
   while (1)
     {
@@ -8342,8 +8342,9 @@ vect_transform_loop_stmt (loop_vec_info loop_vinfo, gimple *stmt,
 
   /* SLP.  Schedule all the SLP instances when the first SLP stmt is
      reached.  */
-  if (STMT_SLP_TYPE (stmt_info))
+  if (slp_vect_type slptype = STMT_SLP_TYPE (stmt_info))
     {
+
       if (!*slp_scheduled)
 	{
 	  *slp_scheduled = true;
@@ -8354,7 +8355,7 @@ vect_transform_loop_stmt (loop_vec_info loop_vinfo, gimple *stmt,
 	}
 
       /* Hybrid SLP stmts must be vectorized in addition to SLP.  */
-      if (PURE_SLP_STMT (stmt_info))
+      if (slptype == pure_slp)
 	return;
     }