[PATCH PR85793]Fix ICE by loading vector(1) scalara_type for 1 element-wise case

[Bin Cheng]

Hi,
This patch fixes ICE by loading vector(1) scalar_type if it's 1 element-wise 
for VMAT_ELEMENTWISE.
Bootstrap and test on x86_64 and AArch64 ongoing.  Is it OK?

Thanks,
bin
2018-05-16  Bin Cheng  <bin.ch...@arm.com>
            Richard Biener  <rguent...@suse.de>

        PR tree-optimization/85793
        * tree-vect-stmts.c (vectorizable_load): Handle 1 element-wise load
        for VMAT_ELEMENTWISE.

gcc/testsuite
2018-05-16  Bin Cheng  <bin.ch...@arm.com>

        PR tree-optimization/85793
        * gcc.dg/vect/pr85793.c: New test.
From 85ef7f0c6ee0cb89804f1cd9d5a39ba26f8aaba3 Mon Sep 17 00:00:00 2001
From: Bin Cheng <binch...@e108451-lin.cambridge.arm.com>
Date: Wed, 16 May 2018 14:30:06 +0100
Subject: [PATCH] pr85793-20180515

---
 gcc/testsuite/gcc.dg/vect/pr85793.c | 12 ++++++++++++
 gcc/tree-vect-stmts.c               |  4 ++++
 2 files changed, 16 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/vect/pr85793.c

diff --git a/gcc/testsuite/gcc.dg/vect/pr85793.c b/gcc/testsuite/gcc.dg/vect/pr85793.c
new file mode 100644
index 0000000..9b5d518
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr85793.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target vect_perm } */
+
+int a, c, d;
+long b[6];
+void fn1() {
+  for (; a < 2; a++) {
+    c = 0;
+    for (; c <= 5; c++)
+      d &= b[a * 3];
+  }
+}
diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index 1e8ccbc..64a157d 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -7662,6 +7662,10 @@ vectorizable_load (gimple *stmt, gimple_stmt_iterator *gsi, gimple **vec_stmt,
 	    }
 	  ltype = build_aligned_type (ltype, TYPE_ALIGN (TREE_TYPE (vectype)));
 	}
+      /* Load vector(1) scalar_type if it's 1 element-wise vectype.  */
+      else if (nloads == 1)
+	ltype = vectype;
+
       if (slp)
 	{
 	  /* For SLP permutation support we need to load the whole group,
-- 
1.9.1