In vect-alias-check-1.c we unroll the inner loop and then vectorise
the stores at a[c + 1][b]. Since the access has no guaranteed
alignemnt, we need a realignment mechanism or support for unaligned
accesses in order to vectorise.
In vect-alias-check-18.c we use a reverse access and so need
permute support in order to vectorise.
I'm not really sure when this part of the testsuite prefers
{ xfail { ! foo } } and when it prefers { target foo }. xfail
seems like the most common choice for the alignment restriction,
whereas vect_int and vect_perm are mostly dg-require-effective-target
style features, so I went with that combination.
Tested on aarch64-linux-gnu, x86_64-linux-gnu, powerpc64-linux-gnu
(Power 7) and sparc-sun-solaris2.11. OK to install?
Richard
2019-11-20 Richard Sandiford <richard.sandif...@arm.com>
gcc/testsuite/
PR testsuite/92543
* gcc.dg/vect/vect-alias-check-1.c: XFAIL the alias check message
if there is no realignment support and no support for unaligned
accesses.
* gcc.dg/vect/vect-alias-check-18.c: Restrict the test for the
alias message to targets that have permute support.
Index: gcc/testsuite/gcc.dg/vect/vect-alias-check-1.c
===================================================================
--- gcc/testsuite/gcc.dg/vect/vect-alias-check-1.c 2019-11-19
16:25:49.000000000 +0000
+++ gcc/testsuite/gcc.dg/vect/vect-alias-check-1.c 2019-11-20
12:35:16.140748524 +0000
@@ -15,5 +15,5 @@ fn1 ()
}
/* { dg-final { scan-tree-dump "improved number of alias checks from \[0-9\]*
to 1" "vect" } } */
-/* { dg-final { scan-tree-dump "using an address-based overlap test" "vect" }
} */
+/* { dg-final { scan-tree-dump "using an address-based overlap test" "vect" {
xfail { vect_no_align && { ! vect_hw_misalign } } } } } */
/* { dg-final { scan-tree-dump-not "using an index-based" "vect" } } */
Index: gcc/testsuite/gcc.dg/vect/vect-alias-check-18.c
===================================================================
--- gcc/testsuite/gcc.dg/vect/vect-alias-check-18.c 2019-11-19
16:25:49.000000000 +0000
+++ gcc/testsuite/gcc.dg/vect/vect-alias-check-18.c 2019-11-20
12:35:16.140748524 +0000
@@ -60,5 +60,5 @@ main (void)
}
/* { dg-final { scan-tree-dump {flags: *WAR\n} "vect" { target vect_int } } }
*/
-/* { dg-final { scan-tree-dump "using an index-based WAR/WAW test" "vect" } }
*/
+/* { dg-final { scan-tree-dump "using an index-based WAR/WAW test" "vect" {
target { vect_int && vect_perm } } } } */
/* { dg-final { scan-tree-dump-not "using an address-based" "vect" } } */
