From 4c052e1528370a5f3f7c023ea9dd8eede16e4841 Mon Sep 17 00:00:00 2001
From: David Malcolm <dmalcolm@redhat.com>
Date: Mon, 9 Jul 2018 17:40:23 -0400
Subject: [PATCH 43/46] Add some test coverage

In particular, note how this allows us to highlight specific loops in
testcases (via dg-remark), and to highlight the specific lines that cause
problems to the vectorizer (via dg-message).

gcc/testsuite/ChangeLog:
	* gcc.dg/vect/vect-alias-check-4.c: Add -fremarks to options.  Add
	dg-remark and dg-message directives to the cover the expected
	vectorization failure reports.
	* gcc.dg/vect/vect-remarks-1.c: New test.
---
 gcc/testsuite/gcc.dg/vect/vect-alias-check-4.c | 11 +++++++----
 gcc/testsuite/gcc.dg/vect/vect-remarks-1.c     | 18 ++++++++++++++++++
 2 files changed, 25 insertions(+), 4 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-remarks-1.c

diff --git a/gcc/testsuite/gcc.dg/vect/vect-alias-check-4.c b/gcc/testsuite/gcc.dg/vect/vect-alias-check-4.c
index 1e5fc27..b08b4b4 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-alias-check-4.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-alias-check-4.c
@@ -1,6 +1,6 @@
 /* { dg-do compile } */
 /* { dg-require-effective-target vect_int } */
-/* { dg-additional-options "--param vect-max-version-for-alias-checks=0" } */
+/* { dg-additional-options "--param vect-max-version-for-alias-checks=0 -fremarks" } */
 
 #define N 16
 
@@ -14,22 +14,25 @@ union u { struct s2 f; struct s3 g; };
 void
 f1 (int a[][N], int b[][N])
 {
-  for (int i = 0; i < N; ++i)
+  for (int i = 0; i < N; ++i) /* { dg-remark "couldn't vectorize loop" } */
     a[0][i] += b[0][i];
+  /* { dg-message "will not create alias checks, as --param vect-max-version-for-alias-checks == 0" "" { target *-*-* } .-2 } */
 }
 
 void
 f2 (union u *a, union u *b)
 {
-  for (int i = 0; i < N; ++i)
+  for (int i = 0; i < N; ++i) /* { dg-remark "couldn't vectorize loop" } */
     a->f.b.a[i] += b->g.e.a[i];
+  /* { dg-message "will not create alias checks, as --param vect-max-version-for-alias-checks == 0" "" { target *-*-* } .-2 } */
 }
 
 void
 f3 (struct s1 *a, struct s1 *b)
 {
-  for (int i = 0; i < N - 1; ++i)
+  for (int i = 0; i < N - 1; ++i) /* { dg-remark "couldn't vectorize loop" } */
     a->a[i + 1] += b->a[i];
+  /* { dg-message "possible dependence between data-refs" "" { target *-*-* } .-2 } */
 }
 
 /* { dg-final { scan-tree-dump-not "LOOP VECTORIZED" "vect" } } */
diff --git a/gcc/testsuite/gcc.dg/vect/vect-remarks-1.c b/gcc/testsuite/gcc.dg/vect/vect-remarks-1.c
new file mode 100644
index 0000000..5006742
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-remarks-1.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-fremarks -O3" } */
+
+extern void accumulate (int x, int *a);
+
+int test_1 (int arr[], int n)
+{
+  int sum = 0;
+  for (int i = 0; i < n; ++i) /* { dg-remark "couldn't vectorize loop" } */
+    accumulate (arr[i], &sum); /* { dg-message "statement clobbers memory: 'accumulate .*'" } */
+  return sum;
+}
+
+void test_2 (int *dst, int *src_a, int *src_b, int n)
+{
+  for (int i = 0; i < n; i++) /* { dg-remark "loop vectorized" } */
+    dst[i] = src_a[i] + src_b[i];
+}
-- 
1.8.5.3