arm: testsuite: make unaligned-memcpy-*.c executable tests [PR91614]

These tests have been looking for a very specific instruction sequence
which has the tendency to be fairly unstable as a result.  But what is
more interesting is that the the tests must not contain instructions
that can't be used for unaligned data, and whether or not the copy is
executed correctly.

So make these tests executable and scan the assembler only to confirm
the absence of instructions that must not be used when the data is not
aligned.

These tests also used to be restricted to targets that support
unaligned accesses (because you get very different code otherwise).
But now we've made the tests executable and to check for the absence
of problem instructions, just falling back to memcpy *is* an
acceptable implementation.  So remove the requirement for unaligned
accesses.

gcc/testsuite:
	PR target/91614
	* gcc.target/arm/unaligned-memcpy-1.c: Make the test executable.
	Only scan for the absence of instructions that cannot access
	misaligned data.  Remove constraint of having unaligned accesses.
	* gcc.target/arm/unaligned-memcpy-2.c: Likewise.
	* gcc.target/arm/unaligned-memcpy-3.c: Likewise.
	* gcc.target/arm/unaligned-memcpy-4.c: Likewise.

4 files changed, 77 insertions, 55 deletions

diff --git a/gcc/testsuite/gcc.target/arm/unaligned-memcpy-1.c b/gcc/testsuite/gcc.target/arm/unaligned-memcpy-1.c
index c4f5640..0d883e3 100644
--- a/gcc/testsuite/gcc.target/arm/unaligned-memcpy-1.c
+++ b/gcc/testsuite/gcc.target/arm/unaligned-memcpy-1.c
@@ -1,19 +1,31 @@
-/* { dg-do compile } */
-/* { dg-require-effective-target arm_unaligned } */
-/* { dg-options "-O2" } */
+/* { dg-do run } */
+/* { dg-options "-O2 -save-temps" } */
 
 #include <string.h>
 
-void unknown_alignment (char *dest, char *src)
+char src[17] __attribute__ ((aligned(8))) = "abcdefghijklmnopq";
+char result[17] __attribute__ ((aligned(8))) = {0};
+
+void __attribute__ ((noinline,noclone))
+unknown_alignment (char *dest, char *src)
 {
   memcpy (dest, src, 15);
 }
 
-/* We should see three unaligned word loads and store pairs, one unaligned
-   ldrh/strh pair, and an ldrb/strb pair.  Sanity check that.  */
+int main ()
+{
+  int i;
+  unknown_alignment (result+1, src+2);
+  for (i = 0; i < 15; i++)
+    if (result[i+1] != src[i+2])
+      __builtin_abort ();
+  if (result[16] != 0)
+    __builtin_abort ();
+  return 0;
+}
+
+/* Check that we don't use any instructions that assume an aligned source.  */
+/* { dg-final { scan-assembler-not {(ldm(ia)?\tr[0-9]|ldrd\t.*\[r[0-9]|vldr)} } } */
 
-/* { dg-final { scan-assembler-times "@ unaligned" 8 } } */
-/* { dg-final { scan-assembler-times "ldrh" 1 } } */
-/* { dg-final { scan-assembler-times "strh" 1 } } */
-/* { dg-final { scan-assembler-times "ldrb" 1 } } */
-/* { dg-final { scan-assembler-times "strb" 1 } } */
+/* Check that we don't use any instructions that assume an aligned dest.  */
+/* { dg-final { scan-assembler-not {(stm(ia)?\tr[0-9]|strd\t.*\[r[0-9]|vstr)} } } */
diff --git a/gcc/testsuite/gcc.target/arm/unaligned-memcpy-2.c b/gcc/testsuite/gcc.target/arm/unaligned-memcpy-2.c
index 1ad730d..0da0bcd 100644
--- a/gcc/testsuite/gcc.target/arm/unaligned-memcpy-2.c
+++ b/gcc/testsuite/gcc.target/arm/unaligned-memcpy-2.c
@@ -1,24 +1,27 @@
-/* { dg-do compile } */
-/* { dg-require-effective-target arm_unaligned } */
-/* { dg-options "-O2" } */
+/* { dg-do run } */
+/* { dg-options "-O2 -save-temps" } */
 
 #include <string.h>
 
-char dest[16] = { 0 };
+char dest[16] __attribute__((aligned(8))) = { 0 } ;
+char input[17] __attribute__ ((aligned(8))) = "abcdefghijklmnop";
 
-void aligned_dest (char *src)
+void __attribute__ ((noinline,noclone)) aligned_dest (char *src)
 {
   memcpy (dest, src, 15);
 }
 
-/* Expect a multi-word store for the main part of the copy, but subword
-   loads/stores for the remainder.  */
+int main ()
+{
+  int i;
+  aligned_dest (input+1);
+  for (i = 0; i < 15; i++)
+    if (dest[i] != input[i+1])
+      __builtin_abort ();
+  if (dest[15] != 0)
+    __builtin_abort ();
+  return 0;
+}
 
-/* { dg-final { scan-assembler-times "ldmia" 0 } } */
-/* { dg-final { scan-assembler-times "ldrd" 0 } } */
-/* { dg-final { scan-assembler-times "stmia" 1 { target { ! { arm_prefer_ldrd_strd } } } } } */
-/* { dg-final { scan-assembler-times "strd" 1 { target { arm_prefer_ldrd_strd } } } } */
-/* { dg-final { scan-assembler-times "ldrh" 1 } } */
-/* { dg-final { scan-assembler-times "strh" 1 } } */
-/* { dg-final { scan-assembler-times "ldrb" 1 } } */
-/* { dg-final { scan-assembler-times "strb" 1 } } */
+/* Check that we don't use any instructions that assume an aligned source.  */
+/* { dg-final { scan-assembler-not {(ldm(ia)?\tr[0-9]|ldrd\t.*\[r[0-9]|vldr)} } } */
diff --git a/gcc/testsuite/gcc.target/arm/unaligned-memcpy-3.c b/gcc/testsuite/gcc.target/arm/unaligned-memcpy-3.c
index d0b09bd..2cfe8b9 100644
--- a/gcc/testsuite/gcc.target/arm/unaligned-memcpy-3.c
+++ b/gcc/testsuite/gcc.target/arm/unaligned-memcpy-3.c
@@ -1,24 +1,27 @@
-/* { dg-do compile } */
-/* { dg-require-effective-target arm_unaligned } */
-/* { dg-options "-O2" } */
+/* { dg-do run } */
+/* { dg-options "-O2 -save-temps" } */
 
 #include <string.h>
 
-char src[16] = {0};
+char src[17] __attribute__ ((aligned(8))) = "abcdefghijklmnop";
+char result[17] __attribute__ ((aligned(8))) = {0};
 
-void aligned_src (char *dest)
+void __attribute__ ((noinline,noclone)) aligned_src (char *dest)
 {
   memcpy (dest, src, 15);
 }
 
-/* Expect a multi-word load for the main part of the copy, but subword
-   loads/stores for the remainder.  */
+int main ()
+{
+  int i;
+  aligned_src (result+1);
+  for (i = 0; i < 15; i++)
+    if (result[i+1] != src[i])
+      __builtin_abort ();
+  if (result[16] != 0)
+    __builtin_abort ();
+  return 0;
+}
 
-/* { dg-final { scan-assembler-times "ldmia" 1 { target { ! { arm_prefer_ldrd_strd } } } } } */
-/* { dg-final { scan-assembler-times "ldrd" 1 { target { arm_prefer_ldrd_strd } } } } */
-/* { dg-final { scan-assembler-times "strd" 0 } } */
-/* { dg-final { scan-assembler-times "stm" 0 } } */
-/* { dg-final { scan-assembler-times "ldrh" 1 { target { ! { arm_prefer_ldrd_strd } } } } } */
-/* { dg-final { scan-assembler-times "strh" 1 } } */
-/* { dg-final { scan-assembler-times "ldrb" 1 { target { ! { arm_prefer_ldrd_strd } } } } } */
-/* { dg-final { scan-assembler-times "strb" 1 } } */
+/* Check that we don't use any instructions that assume an aligned dest.  */
+/* { dg-final { scan-assembler-not {(stm(ia)?\tr[0-9]|strd\t.*\[r[0-9]|vstr)} } } */
diff --git a/gcc/testsuite/gcc.target/arm/unaligned-memcpy-4.c b/gcc/testsuite/gcc.target/arm/unaligned-memcpy-4.c
index d236513..3f074e3 100644
--- a/gcc/testsuite/gcc.target/arm/unaligned-memcpy-4.c
+++ b/gcc/testsuite/gcc.target/arm/unaligned-memcpy-4.c
@@ -1,22 +1,26 @@
-/* { dg-do compile } */
-/* { dg-require-effective-target arm_unaligned } */
-/* { dg-options "-O2" } */
+/* { dg-do run } */
+/* { dg-options "-O2 -save-temps" } */
 
 #include <string.h>
 
-char src[16] = { 0 };
-char dest[16] = { 0 };
+char src[16] __attribute__ ((aligned(8))) = "abcdefghijklmnop";
+char dest[16] __attribute__ ((aligned(8))) = { 0 };
 
-void aligned_both (void)
+void __attribute__ ((noinline,noclone))
+aligned_both (void)
 {
-  memcpy (dest, src, 15);
+  memcpy (dest, src, 16);
 }
 
-/* We know both src and dest to be aligned: expect multiword loads/stores.  */
+int main ()
+{
+  int i;
+  aligned_both ();
+  for (i = 0; i < 16; i++)
+    if (dest[i] != src[i])
+      __builtin_abort ();
+  return 0;
+}
 
-/* { dg-final { scan-assembler-times "ldm" 1 { target { ! { arm_prefer_ldrd_strd } } } } } */
-/* { dg-final { scan-assembler-times "stmia" 1 { target { ! { arm_prefer_ldrd_strd } } } } } */
-/* { dg-final { scan-assembler "ldrd" { target { arm_prefer_ldrd_strd } } } } */
-/* { dg-final { scan-assembler-times "ldm" 0 { target { arm_prefer_ldrd_strd } } } } */
-/* { dg-final { scan-assembler "strd" { target { arm_prefer_ldrd_strd } } } } */
-/* { dg-final { scan-assembler-times "stm" 0 { target { arm_prefer_ldrd_strd } } } } */
+/* There should be no 'unaligned' comments.  */
+/* { dg-final { scan-assembler-not "unaligned" } } */