From: Richard Sandiford <richard.sandiford@linaro.org>
To: gcc-patches@gcc.gnu.org
Subject: PR81738: Split vect-alias-check-6.c
Date: Thu, 10 Aug 2017 13:42:00 -0000 [thread overview]
Message-ID: <87y3qrv8zw.fsf@linaro.org> (raw)
The second loop in the testcase only vectorises if we can reverse
a vector and if aligned loads aren't required.
Sanity-checked on aarch64-linux-gnu, x86_64-linux-gnu and
powerpc64le-linux-gnu (although all three were unaffected).
OK to install?
Thanks,
Richard
2017-08-10 Richard Sandiford <richard.sandiford@linaro.org>
gcc/testsuite/
PR testsuite/81738
* gcc.dg/vect/vect-alias-check-6.c: Move second function to...
* gcc.dg/vect/vect-alias-check-7.c: ...this new file. Require
vect_perm and vect_element_align for vectorization.
Index: gcc/testsuite/gcc.dg/vect/vect-alias-check-6.c
===================================================================
--- gcc/testsuite/gcc.dg/vect/vect-alias-check-6.c 2017-08-04 11:40:26.372205514 +0100
+++ gcc/testsuite/gcc.dg/vect/vect-alias-check-6.c 2017-08-10 14:36:24.201888108 +0100
@@ -12,12 +12,5 @@ f1 (struct s *a, struct s *b)
a->x[i + 1] += b->x[i];
}
-void
-f2 (struct s *a, struct s *b)
-{
- for (int i = 0; i < N; ++i)
- a->x[i] += b->x[N - i - 1];
-}
-
-/* { dg-final { scan-tree-dump-times {checking that [^\n]* and [^\n]* have different addresses} 2 "vect" } } */
-/* { dg-final { scan-tree-dump-times "LOOP VECTORIZED" 2 "vect" } } */
+/* { dg-final { scan-tree-dump {checking that [^\n]* and [^\n]* have different addresses} "vect" } } */
+/* { dg-final { scan-tree-dump "LOOP VECTORIZED" "vect" } } */
Index: gcc/testsuite/gcc.dg/vect/vect-alias-check-7.c
===================================================================
--- /dev/null 2017-08-09 18:16:39.535015779 +0100
+++ gcc/testsuite/gcc.dg/vect/vect-alias-check-7.c 2017-08-10 14:36:24.201888108 +0100
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target vect_int } */
+
+#define N 16
+
+struct s { int x[N]; };
+
+void
+f1 (struct s *a, struct s *b)
+{
+ for (int i = 0; i < N; ++i)
+ a->x[i] += b->x[N - i - 1];
+}
+
+/* { dg-final { scan-tree-dump {checking that [^\n]* and [^\n]* have different addresses} "vect" } } */
+/* { dg-final { scan-tree-dump "LOOP VECTORIZED" "vect" { target { vect_perm && vect_element_align } } } } */
next reply other threads:[~2017-08-10 13:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-10 13:42 Richard Sandiford [this message]
2017-08-10 19:06 ` Richard Biener
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