[gcc r10-6689] tree-ssa: Fix ICE in build_vector_type [PR93780]

[gcc r10-6689] tree-ssa: Fix ICE in build_vector_type [PR93780]

[Jakub Jelinek]

https://gcc.gnu.org/g:be7c145ad52e76a1a0fd201dd96bc92e8d3a275d

commit r10-6689-gbe7c145ad52e76a1a0fd201dd96bc92e8d3a275d
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Feb 18 09:07:15 2020 +0100

    tree-ssa: Fix ICE in build_vector_type [PR93780]
    
    The following testcase ICEs, because execute_update_addresses_taken attempts
    to create a VECTOR_TYPE with non-power of 2 number of elts.
    Fixed by guarding it with the corresponding predicate.
    
    2020-02-18  Jakub Jelinek  <jakub@redhat.com>
    
    	PR tree-optimization/93780
    	* tree-ssa.c (non_rewritable_lvalue_p): Check valid_vector_subparts_p
    	before calling build_vector_type.
    	(execute_update_addresses_taken): Likewise.
    
    	* gcc.dg/pr93780.c: New test.

Diff:
---
 gcc/ChangeLog                  |  5 +++++
 gcc/testsuite/ChangeLog        |  7 ++++++-
 gcc/testsuite/gcc.dg/pr93780.c | 15 +++++++++++++++
 gcc/tree-ssa.c                 |  6 ++++--
 4 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e8eaf7e..99d32c0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2020-02-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/93780
+	* tree-ssa.c (non_rewritable_lvalue_p): Check valid_vector_subparts_p
+	before calling build_vector_type.
+	(execute_update_addresses_taken): Likewise.
+
 	PR driver/93796
 	* params.opt (-param=ipa-max-switch-predicate-bounds=): Fix help
 	typo, functoin -> function.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 0e7d7bc..8f2c5b0 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,9 +1,14 @@
+2020-02-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/93780
+	* gcc.dg/pr93780.c: New test.
+
 2020-02-17  David Malcolm  <dmalcolm@redhat.com>
 
 	PR analyzer/93775
 	* gcc.dg/analyzer/20020129-1.c: New test.
 
-2020-02-17  Alexandre Oliva <oliva@adacore.com>
+2020-02-17  Alexandre Oliva  <oliva@adacore.com>
 
 	* gcc.dg/tls/emutls-3.c: New, combining emutls-2.c and
 	thr-init-2.c into an execution test with explicitly common
diff --git a/gcc/testsuite/gcc.dg/pr93780.c b/gcc/testsuite/gcc.dg/pr93780.c
new file mode 100644
index 0000000..d476df6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr93780.c
@@ -0,0 +1,15 @@
+/* PR tree-optimization/93780 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-additional-options "-mavx" { target avx } } */
+
+typedef float V __attribute__((vector_size (32)));
+
+float
+foo (void)
+{
+  const float init[6] = {};
+  V v = {};
+  __builtin_memcpy (&v, init, sizeof (init));
+  return v[0];
+}
diff --git a/gcc/tree-ssa.c b/gcc/tree-ssa.c
index dbff604..344f32d 100644
--- a/gcc/tree-ssa.c
+++ b/gcc/tree-ssa.c
@@ -1550,7 +1550,8 @@ non_rewritable_lvalue_p (tree lhs)
 	      && multiple_p (lhs_bits,
 			     tree_to_uhwi
 			       (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl)))),
-			     &nelts))
+			     &nelts)
+	      && valid_vector_subparts_p (nelts))
 	    {
 	      if (known_eq (nelts, 1u))
 		return false;
@@ -1925,7 +1926,8 @@ execute_update_addresses_taken (void)
 					     (TYPE_SIZE (TREE_TYPE
 							   (TREE_TYPE (sym)))),
 					   &nelts)
-			    && maybe_ne (nelts, 1u))
+			    && maybe_ne (nelts, 1u)
+			    && valid_vector_subparts_p (nelts))
 			  temtype = build_vector_type (temtype, nelts);
 			tree tem = make_ssa_name (temtype);
 			gimple *pun