[PATCH] S/390: bswap64 testcases require -mzarch.

[Andreas Krebbel]

We have 64 bit bswap patterns in 32 bit code as long as we use
-mzarch.

gcc/testsuite/ChangeLog:

2015-11-25  Andreas Krebbel  <kreb...@linux.vnet.ibm.com>

        * gcc.dg/optimize-bswapdi-1.c: Force using -mzarch on s390 and
        s390x to enable 64 bit bswap patterns.
        * gcc.dg/optimize-bswapdi-2.c: Likewise.
        * gcc.dg/optimize-bswapdi-3.c: Likewise.
        * lib/target-supports.exp: Add a comment for s390.
---
 gcc/testsuite/gcc.dg/optimize-bswapdi-1.c | 1 +
 gcc/testsuite/gcc.dg/optimize-bswapdi-2.c | 1 +
 gcc/testsuite/gcc.dg/optimize-bswapdi-3.c | 1 +
 gcc/testsuite/lib/target-supports.exp     | 2 ++
 4 files changed, 5 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/optimize-bswapdi-1.c 
b/gcc/testsuite/gcc.dg/optimize-bswapdi-1.c
index 0b5fe29..251dbc2 100644
--- a/gcc/testsuite/gcc.dg/optimize-bswapdi-1.c
+++ b/gcc/testsuite/gcc.dg/optimize-bswapdi-1.c
@@ -2,6 +2,7 @@
 /* { dg-require-effective-target bswap64 } */
 /* { dg-require-effective-target stdint_types } */
 /* { dg-options "-O2 -fdump-tree-bswap" } */
+/* { dg-additional-options "-mzarch" { target s390*-*-* } } */
 
 #include <stdint.h>
 #define __const_swab64(x) ((uint64_t)(                                         
\
diff --git a/gcc/testsuite/gcc.dg/optimize-bswapdi-2.c 
b/gcc/testsuite/gcc.dg/optimize-bswapdi-2.c
index 7ac0323..2c81087 100644
--- a/gcc/testsuite/gcc.dg/optimize-bswapdi-2.c
+++ b/gcc/testsuite/gcc.dg/optimize-bswapdi-2.c
@@ -2,6 +2,7 @@
 /* { dg-require-effective-target bswap64 } */
 /* { dg-require-effective-target stdint_types } */
 /* { dg-options "-O2 -fdump-tree-bswap" } */
+/* { dg-additional-options "-mzarch" { target s390*-*-* } } */
 
 #include <stdint.h>
 
diff --git a/gcc/testsuite/gcc.dg/optimize-bswapdi-3.c 
b/gcc/testsuite/gcc.dg/optimize-bswapdi-3.c
index 3c66505..273b4bc 100644
--- a/gcc/testsuite/gcc.dg/optimize-bswapdi-3.c
+++ b/gcc/testsuite/gcc.dg/optimize-bswapdi-3.c
@@ -2,6 +2,7 @@
 /* { dg-require-effective-target bswap64 } */
 /* { dg-require-effective-target stdint_types } */
 /* { dg-options "-O2 -fdump-tree-bswap" } */
+/* { dg-additional-options "-mzarch" { target s390*-*-* } } */
 
 #include <stdint.h>
 
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 3eb46f2..acd786e 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -5487,6 +5487,8 @@ proc check_effective_target_bswap32 { } {
 }
 
 # Return 1 if the target supports 64-bit byte swap instructions.
+#
+# Note: 32bit s390 targets require -mzarch in dg-options.
 
 proc check_effective_target_bswap64 { } {
     global et_bswap64_saved
-- 
2.3.0