[PATCH 1/2] aarch64: Fix issue with __pld builtin at -O0 [PR 123548]

[Alfie Richards]

This fixes the issues with __pld by changing the arguments in arm_acle.h
to be const which seems to stop the creation of SSA nodes.

        PR target/123548

gcc/ChangeLog:

        * config/aarch64/arm_acle.h (__plix): Change arguments to be
        const.
        (__pldx): Change arguments to be const.

gcc/testsuite/ChangeLog:

        * gcc.target/aarch64/pr123548.c: New test.
---
 gcc/config/aarch64/arm_acle.h               |  8 ++++----
 gcc/testsuite/gcc.target/aarch64/pr123548.c | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+), 4 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/aarch64/pr123548.c

diff --git a/gcc/config/aarch64/arm_acle.h b/gcc/config/aarch64/arm_acle.h
index 651f4cb8b60..3d36c96ea53 100644
--- a/gcc/config/aarch64/arm_acle.h
+++ b/gcc/config/aarch64/arm_acle.h
@@ -94,16 +94,16 @@ __pli (void const volatile *__addr)
 
 __extension__ extern __inline void
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
-__plix (unsigned int __cache, unsigned int __rettn,
+__plix (const unsigned int __cache, const unsigned int __rettn,
        void const volatile *__addr)
 {
   return __builtin_aarch64_plix (__cache, __rettn, __addr);
 }
 
 __extension__ extern __inline void
-__attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
-__pldx (unsigned int __access, unsigned int __cache, unsigned int __rettn,
-       void const volatile *__addr)
+  __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
+  __pldx (const unsigned int __access, const unsigned int __cache,
+         const unsigned int __rettn, void const volatile *__addr)
 {
   return __builtin_aarch64_pldx (__access, __cache, __rettn, __addr);
 }
diff --git a/gcc/testsuite/gcc.target/aarch64/pr123548.c 
b/gcc/testsuite/gcc.target/aarch64/pr123548.c
new file mode 100644
index 00000000000..c3e752197ce
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/pr123548.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O0" } */
+/* { dg-final { check-function-bodies "**" "" "" } } */
+
+#include <arm_acle.h>
+
+void
+test (void *a)
+{
+  __pldx (1, 1, 1, a);
+}
+/*
+** test:
+**...
+**     prfm\tPSTL2STRM, \[x[0-9]+\]
+**...
+**     ret
+*/
-- 
2.34.1