[gcc r14-6598] aarch64, testsuite: Fix up auto-init-padding tests

[Alex Coplan]

https://gcc.gnu.org/g:635093595ff5ffbcab74a0d63584daf51537c542

commit r14-6598-g635093595ff5ffbcab74a0d63584daf51537c542
Author: Alex Coplan <alex.coplan@arm.com>
Date:   Wed Nov 15 10:24:41 2023 +0000

    aarch64, testsuite: Fix up auto-init-padding tests
    
    The tests currently depend on memcpy lowering forming stps at -O0,
    but we no longer want to form stps during memcpy lowering, but instead
    in the upcoming load/store pair fusion pass.
    
    This patch therefore tweaks affected tests to enable optimizations
    (-O1), and adjusts the tests to avoid parts of the structures being
    optimized away where necessary.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/aarch64/auto-init-padding-1.c: Add -O to options,
            adjust test to work with optimizations enabled.
            * gcc.target/aarch64/auto-init-padding-2.c: Add -O to options.
            * gcc.target/aarch64/auto-init-padding-3.c: Add -O to options,
            adjust test to work with optimizations enabled.
            * gcc.target/aarch64/auto-init-padding-4.c: Likewise.
            * gcc.target/aarch64/auto-init-padding-9.c: Likewise.

Diff:
---
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-1.c | 8 +++++---
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-2.c | 2 +-
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-3.c | 7 ++++---
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-4.c | 4 ++--
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-9.c | 7 ++++---
 5 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-1.c b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-1.c
index c747ebdcdf7..7027454dc74 100644
--- a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-1.c
+++ b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-1.c
@@ -1,17 +1,19 @@
 /* Verify zero initialization for structure type automatic variables with
    padding.  */
 /* { dg-do compile } */
-/* { dg-options "-ftrivial-auto-var-init=zero" } */
+/* { dg-options "-O -ftrivial-auto-var-init=zero" } */
 
 struct test_aligned {
         int internal1;
         long long internal2;
 } __attribute__ ((aligned(64)));
 
-int foo ()
+void bar (struct test_aligned *);
+
+void foo ()
 {
   struct test_aligned var;
-  return var.internal1;
+  bar(&var);
 }
 
 /* { dg-final { scan-assembler-times {stp\tq[0-9]+, q[0-9]+,} 2 } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-2.c b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-2.c
index 6e280904da1..d3b6591c9b0 100644
--- a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-2.c
+++ b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-2.c
@@ -1,7 +1,7 @@
 /* Verify pattern initialization for structure type automatic variables with
    padding.  */
 /* { dg-do compile } */
-/* { dg-options "-ftrivial-auto-var-init=pattern" } */
+/* { dg-options "-O -ftrivial-auto-var-init=pattern" } */
 
 struct test_aligned {
         int internal1;
diff --git a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-3.c b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-3.c
index 9ddea58b468..aad4bb8944f 100644
--- a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-3.c
+++ b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-3.c
@@ -1,7 +1,7 @@
 /* Verify zero initialization for nested structure type automatic variables with
    padding.  */
 /* { dg-do compile } */
-/* { dg-options "-ftrivial-auto-var-init=zero" } */
+/* { dg-options "-O -ftrivial-auto-var-init=zero" } */
 
 struct test_aligned {
         unsigned internal1;
@@ -16,11 +16,12 @@ struct test_big_hole {
         struct test_aligned four;
 } __attribute__ ((aligned(64)));
 
+void bar (struct test_big_hole *);
 
-int foo ()
+void foo ()
 {
   struct test_big_hole var;
-  return var.four.internal1;
+  bar (&var);
 }
 
 /* { dg-final { scan-assembler-times {stp\tq[0-9]+, q[0-9]+,} 4 } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-4.c b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-4.c
index 75bba82ed34..efd310f054d 100644
--- a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-4.c
+++ b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-4.c
@@ -1,7 +1,7 @@
 /* Verify pattern initialization for nested structure type automatic variables with
    padding.  */
 /* { dg-do compile } */
-/* { dg-options "-ftrivial-auto-var-init=pattern" } */
+/* { dg-options "-O -ftrivial-auto-var-init=pattern" } */
 
 struct test_aligned {
         unsigned internal1;
@@ -23,4 +23,4 @@ int foo ()
   return var.four.internal1;
 }
 
-/* { dg-final { scan-assembler-times {stp\tq[0-9]+, q[0-9]+,} 5 } } */
+/* { dg-final { scan-assembler-times {stp\tq[0-9]+, q[0-9]+,} 4 } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-9.c b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-9.c
index 0f1930f813e..64ed8f11fe6 100644
--- a/gcc/testsuite/gcc.target/aarch64/auto-init-padding-9.c
+++ b/gcc/testsuite/gcc.target/aarch64/auto-init-padding-9.c
@@ -1,7 +1,7 @@
 /* Verify zero initialization for array type with structure element with
    padding.  */ 
 /* { dg-do compile } */
-/* { dg-options "-ftrivial-auto-var-init=zero" } */
+/* { dg-options "-O -ftrivial-auto-var-init=zero" } */
 
 struct test_trailing_hole {
         int one;
@@ -11,11 +11,12 @@ struct test_trailing_hole {
         /* "sizeof(unsigned long) - 1" byte padding hole here. */
 };
 
+void bar (void *);
 
-int foo ()
+void foo ()
 {
   struct test_trailing_hole var[10]; 
-  return var[2].four;
+  bar (var);
 }
 
 /* { dg-final { scan-assembler-times {stp\tq[0-9]+, q[0-9]+,} 5 } } */