[gcc(refs/vendors/ARM/heads/gcs-13)] aarch64: Add march flags for +the and +d128 arch extensions

[Szabolcs Nagy <nsz@gcc.gnu.org>]

https://gcc.gnu.org/g:33bfcdbe6939603c7832832f19400024ec08e8ed

commit 33bfcdbe6939603c7832832f19400024ec08e8ed
Author: Victor Do Nascimento <victor.donascimento@arm.com>
Date:   Wed May 3 12:02:54 2023 +0100

    aarch64: Add march flags for +the and +d128 arch extensions
    
    Given the introduction of optional 128-bit page table descriptor and
    translation hardening extension support with the Arm9.4-a
    architecture, this introduces the relevant flags to enable the reading
    and writing of 128-bit system registers.
    
    The `+d128' -march modifier enables the use of the following ACLE
    builtin functions:
    
      * __uint128_t __arm_rsr128(const char *special_register);
      * void __arm_wsr128(const char *special_register, __uint128_t value);
    
    and defines the __ARM_FEATURE_SYSREG128 macro to 1.
    
    Finally, the `rcwmask_el1' and `rcwsmask_el1' 128-bit system register
    implementations are also reliant on the enablement of the `+the' flag,
    which is thus also implemented in this patch.
    
    gcc/ChangeLog:
    
            * config/aarch64/aarch64-c.cc (__ARM_FEATURE_SYSREG128): New.
            * config/aarch64/aarch64-arches.def (armv8.9-a): New.
            (armv9.4-a): Likewise.
            * config/aarch64/aarch64-option-extensions.def (d128): Likewise.
            (the): Likewise.
            * config/aarch64/aarch64.h (AARCH64_ISA_V9_4A): Likewise.
            (AARCH64_ISA_V8_9A): Likewise.
            (TARGET_ARMV9_4): Likewise.
            (AARCH64_ISA_D128): Likewise.
            (AARCH64_ISA_THE): Likewise.
            (TARGET_D128): Likewise.
            * doc/invoke.texi (AArch64 Options): Document new -march flags
            and extensions.
    
    (cherry picked from commit 16a05fac33ddde7a50da9cb937a9b83ea7c111f6)
    
    Heavily modified when merged.

Diff:
---
 gcc/config/aarch64/aarch64-arches.def | 2 ++
 gcc/config/aarch64/aarch64.h          | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/gcc/config/aarch64/aarch64-arches.def b/gcc/config/aarch64/aarch64-arches.def
index 7ae92aa8e984..becccb801d02 100644
--- a/gcc/config/aarch64/aarch64-arches.def
+++ b/gcc/config/aarch64/aarch64-arches.def
@@ -39,10 +39,12 @@ AARCH64_ARCH("armv8.5-a",     generic,       V8_5A,     8,  (V8_4A, SB, SSBS, PR
 AARCH64_ARCH("armv8.6-a",     generic,       V8_6A,     8,  (V8_5A, I8MM, BF16))
 AARCH64_ARCH("armv8.7-a",     generic,       V8_7A,     8,  (V8_6A, LS64))
 AARCH64_ARCH("armv8.8-a",     generic,       V8_8A,     8,  (V8_7A, MOPS))
+AARCH64_ARCH("armv8.9-a",     generic,       V8_9A,     8,  (V8_8A))
 AARCH64_ARCH("armv8-r",       generic,       V8R  ,     8,  (V8_4A))
 AARCH64_ARCH("armv9-a",       generic,       V9A  ,     9,  (V8_5A, SVE2))
 AARCH64_ARCH("armv9.1-a",     generic,       V9_1A,     9,  (V8_6A, V9A))
 AARCH64_ARCH("armv9.2-a",     generic,       V9_2A,     9,  (V8_7A, V9_1A))
 AARCH64_ARCH("armv9.3-a",     generic,       V9_3A,     9,  (V8_8A, V9_2A))
+AARCH64_ARCH("armv9.4-a",     generic,       V9_4A,     9,  (V8_9A, V9_3A))
 
 #undef AARCH64_ARCH
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 114c4edea45b..bd2650191dea 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -219,6 +219,7 @@ enum class aarch64_feature : unsigned char {
 #define AARCH64_ISA_V9_1A          (aarch64_isa_flags & AARCH64_FL_V9_1A)
 #define AARCH64_ISA_V9_2A          (aarch64_isa_flags & AARCH64_FL_V9_2A)
 #define AARCH64_ISA_V9_3A          (aarch64_isa_flags & AARCH64_FL_V9_3A)
+#define AARCH64_ISA_V9_4A	   (aarch64_isa_flags & AARCH64_FL_V9_4A)
 #define AARCH64_ISA_MOPS	   (aarch64_isa_flags & AARCH64_FL_MOPS)
 #define AARCH64_ISA_LS64	   (aarch64_isa_flags & AARCH64_FL_LS64)
 #define AARCH64_ISA_CSSC	   (aarch64_isa_flags & AARCH64_FL_CSSC)
@@ -366,6 +367,9 @@ enum class aarch64_feature : unsigned char {
 /* ARMv8.1-A Adv.SIMD support.  */
 #define TARGET_SIMD_RDMA (TARGET_SIMD && AARCH64_ISA_RDMA)
 
+/* Armv9.4-A features.  */
+#define TARGET_ARMV9_4 (AARCH64_ISA_V9_4A)
+
 /* Standard register usage.  */
 
 /* 31 64-bit general purpose registers R0-R30: