[PATCH][AARCH64]Add ACLE 2.0 predefined macros: __ARM_ALIGN_MAX_PWR and __ARM_ALIGN_MAX_STACK_PWR

[Renlin Li <renlin.li@arm.com>]

[-- Attachment #1: Type: text/plain, Size: 881 bytes --]

Hi all,

This is a simple patch to add another two ACLE 2.0 predefined macros 
into aarch64 backend.
They are __ARM_ALIGN_MAX_PWR and __ARM_ALIGN_MAX_STACK_PWR. Currently, 
those two values are hard-wired to 16.

The following clauses from ACLE 2.0 documentation indicate the meaning 
of those two macros:

The macro __ARM_ALIGN_MAX_STACK_PWR indicates (as the exponent of a 
power of 2) the maximum available stack alignment.
The macro __ARM_ALIGN_MAX_PWR indicates (as the exponent of a power of 
2) the maximum available alignment of static data.

aarch64-none-elf target is tested on on the model. No new regression.

Is it Okay for trunk?

Regards,
Renlin Li

gcc/ChangeLog

2014-12-16  Renlin Li  <renlin.li@arm.com>

         * config/aarch64/aarch64.h(TARGET_CPU_CPP_BUILTINS): Define 
__ARM_ALIGN_MAX_PWR
         and __ARM_ALIGN_MAX_STACK_PWR.

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: align.patch --]
[-- Type: text/x-patch; name=align.patch, Size: 798 bytes --]

diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 8ed1f84..78417d7 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -29,6 +29,10 @@
       builtin_define ("__aarch64__");                   \
       builtin_define ("__ARM_64BIT_STATE");             \
       builtin_define_with_int_value                     \
+        ("__ARM_ALIGN_MAX_PWR", 16);			\
+      builtin_define_with_int_value                     \
+        ("__ARM_ALIGN_MAX_STACK_PWR", 16);		\
+      builtin_define_with_int_value                     \
         ("__ARM_ARCH", aarch64_architecture_version);   \
       cpp_define_formatted                                              \
         (parse_in, "__ARM_ARCH_%dA", aarch64_architecture_version);     \