[PATCH 4/7][ARM] Add ACLE feature macro for ARMv8.1 instructions.

[Matthew Wahab]

Hello,

This patch adds the feature macro __ARM_FEATURE_QRDMX to indicate the
presence of the ARMv8.1 instructions vqrdmlah and vqrdmlsh. It is
defined when the instructions are available, as it is when
-march=armv8.1-a is enabled with suitable fpu options.

Tested the series for arm-none-eabi with cross-compiled check-gcc on an
ARMv8.1 emulator. Also tested arm-none-linux-gnueabihf with native
bootstrap and make check.

Ok for trunk?
Matthew

gcc/
2015-11-26  Matthew Wahab  <matthew.wa...@arm.com>

        * config/arm/arm-c.c (arm_cpu_builtins): Define __ARM_FEATURE_QRDMX.


>From 4009cf5c0455429a415be9ca239ac09ac86b17dd Mon Sep 17 00:00:00 2001
From: Matthew Wahab <matthew.wa...@arm.com>
Date: Wed, 17 Jun 2015 13:25:09 +0100
Subject: [PATCH 4/7] [ARM] Add __ARM_FEATURE_QRDMX

Change-Id: I26cde507e8844a731e4fd857fbd30bf87f213f89
---
 gcc/config/arm/arm-c.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/config/arm/arm-c.c b/gcc/config/arm/arm-c.c
index c336a16..6bf740b 100644
--- a/gcc/config/arm/arm-c.c
+++ b/gcc/config/arm/arm-c.c
@@ -66,6 +66,8 @@ arm_cpu_builtins (struct cpp_reader* pfile)
   def_or_undef_macro (pfile, "__ARM_FEATURE_SAT", TARGET_ARM_SAT);
   def_or_undef_macro (pfile, "__ARM_FEATURE_CRYPTO", TARGET_CRYPTO);
 
+  if (TARGET_NEON_RDMA)
+    builtin_define ("__ARM_FEATURE_QRDMX");
   if (unaligned_access)
     builtin_define ("__ARM_FEATURE_UNALIGNED");
   if (TARGET_CRC32)
-- 
2.1.4