[AArch64, 2/6] Add new arch command line feaures from ARMv8.5-A

This patch is part of a series that enables ARMv8.5-A in GCC and
adds Branch Target Identification Mechanism.

This patch add all the command line feature that are added by ARMv8.5.
Optional extensions to armv8.5-a:
+rng : Random number Generation Instructions.
+memtag : Memory Tagging Extension.

ARMv8.5-A features that are optional to older arch:
+sb : Speculation barrier instruction.
+ssbs: Speculative Store Bypass Safe instruction.
+predres: Execution and Data Prediction Restriction instructions.

All of the above only effect the assembler and have already gone in the
trunk of binutils.

*** gcc/ChangeLog ***

2018-01-09  Sudakshina Das  <sudi.das@arm.com>

	* config/aarch64/aarch64-option-extensions.def: Define
	AARCH64_OPT_EXTENSION for memtag, rng, sb, ssbs and predres.
	* gcc/config/aarch64/aarch64.h (AARCH64_FL_RNG): New.
	(AARCH64_FL_MEMTAG, ARCH64_FL_SB, AARCH64_FL_SSBS): New.
	(AARCH64_FL_PREDRES): New.
	(AARCH64_FL_FOR_ARCH8_5): Add AARCH64_FL_SB, AARCH64_FL_SSBS and
	AARCH64_FL_PREDRES by default.
	* gcc/doc/invoke.texi: Document rng, memtag, sb, ssbs and predres.

From-SVN: r267766

4 files changed, 61 insertions, 1 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5aa91ca..99f9022 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,16 @@
 2018-01-09  Sudakshina Das  <sudi.das@arm.com>
 
+	* config/aarch64/aarch64-option-extensions.def: Define
+	AARCH64_OPT_EXTENSION for memtag, rng, sb, ssbs and predres.
+	* gcc/config/aarch64/aarch64.h (AARCH64_FL_RNG): New.
+	(AARCH64_FL_MEMTAG, ARCH64_FL_SB, AARCH64_FL_SSBS): New.
+	(AARCH64_FL_PREDRES): New.
+	(AARCH64_FL_FOR_ARCH8_5): Add AARCH64_FL_SB, AARCH64_FL_SSBS and
+	AARCH64_FL_PREDRES by default.
+	* gcc/doc/invoke.texi: Document rng, memtag, sb, ssbs and predres.
+
+2018-01-09  Sudakshina Das  <sudi.das@arm.com>
+
 	* config/aarch64/aarch64-arches.def: Define AARCH64_ARCH for
 	ARMv8.5-A.
 	* gcc/config/aarch64/aarch64.h (AARCH64_FL_V8_5): New.
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index 12b390d..2879e35 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -108,4 +108,19 @@ AARCH64_OPT_EXTENSION("sve", AARCH64_FL_SVE, AARCH64_FL_FP | AARCH64_FL_SIMD | A
 /* Enabling/Disabling "profile" does not enable/disable any other feature.  */
 AARCH64_OPT_EXTENSION("profile", AARCH64_FL_PROFILE, 0, 0, "")
 
+/* Enabling/Disabling "rng" only changes "rng".  */
+AARCH64_OPT_EXTENSION("rng", AARCH64_FL_RNG, 0, 0, "")
+
+/* Enabling/Disabling "memtag" only changes "memtag".  */
+AARCH64_OPT_EXTENSION("memtag", AARCH64_FL_MEMTAG, 0, 0, "")
+
+/* Enabling/Disabling "sb" only changes "sb".  */
+AARCH64_OPT_EXTENSION("sb", AARCH64_FL_SB, 0, 0, "")
+
+/* Enabling/Disabling "ssbs" only changes "ssbs".  */
+AARCH64_OPT_EXTENSION("ssbs", AARCH64_FL_SSBS, 0, 0, "")
+
+/* Enabling/Disabling "predres" only changes "predres".  */
+AARCH64_OPT_EXTENSION("predres", AARCH64_FL_PREDRES, 0, 0, "")
+
 #undef AARCH64_OPT_EXTENSION
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 1d8a0ef..10e73bb 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -179,6 +179,18 @@ extern unsigned aarch64_architecture_version;
 
 /* ARMv8.5-A architecture extensions.  */
 #define AARCH64_FL_V8_5	      (1 << 22)  /* Has ARMv8.5-A features.  */
+#define AARCH64_FL_RNG	      (1 << 23)  /* ARMv8.5-A Random Number Insns.  */
+#define AARCH64_FL_MEMTAG     (1 << 24)  /* ARMv8.5-A Memory Tagging
+					    Extensions.  */
+
+/* Speculation Barrier instruction supported.  */
+#define AARCH64_FL_SB	      (1 << 25)
+
+/* Speculative Store Bypass Safe instruction supported.  */
+#define AARCH64_FL_SSBS	      (1 << 26)
+
+/* Execution and Data Prediction Restriction instructions supported.  */
+#define AARCH64_FL_PREDRES    (1 << 27)
 
 /* Has FP and SIMD.  */
 #define AARCH64_FL_FPSIMD     (AARCH64_FL_FP | AARCH64_FL_SIMD)
@@ -199,7 +211,8 @@ extern unsigned aarch64_architecture_version;
   (AARCH64_FL_FOR_ARCH8_3 | AARCH64_FL_V8_4 | AARCH64_FL_F16FML \
    | AARCH64_FL_DOTPROD | AARCH64_FL_RCPC8_4)
 #define AARCH64_FL_FOR_ARCH8_5			\
-  (AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_V8_5)
+  (AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_V8_5	\
+   | AARCH64_FL_SB | AARCH64_FL_SSBS | AARCH64_FL_PREDRES)
 
 /* Macros to test ISA flags.  */
 
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index f2d11e8..c7c80f7 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -15836,6 +15836,27 @@ Use of this option with architectures prior to Armv8.2-A is not supported.
 @item profile
 Enable the Statistical Profiling extension.  This option is only to enable the
 extension at the assembler level and does not affect code generation.
+@item rng
+Enable the Armv8.5-a Random Number instructions.  This option is only to
+enable the extension at the assembler level and does not affect code
+generation.
+@item memtag
+Enable the Armv8.5-a Memory Tagging Extensions.  This option is only to
+enable the extension at the assembler level and does not affect code
+generation.
+@item sb
+Enable the Armv8-a Speculation Barrier instruction.  This option is only to
+enable the extension at the assembler level and does not affect code
+generation.  This option is enabled by default for @option{-march=armv8.5-a}.
+@item ssbs
+Enable the Armv8-a Speculative Store Bypass Safe instruction.  This option
+is only to enable the extension at the assembler level and does not affect code
+generation.  This option is enabled by default for @option{-march=armv8.5-a}.
+@item predres
+Enable the Armv8-a Execution and Data Prediction Restriction instructions.
+This option is only to enable the extension at the assembler level and does
+not affect code generation.  This option is enabled by default for
+@option{-march=armv8.5-a}.
 
 @end table