ARMv8.2-A extends the ARMv8.1-A architecture, adding features that
include an optional extension to support FP16 in floating-point and
Adv.SIMD instructions. This patch adds the command line and feature
flags for ARMv8.2-A and the FP16 support.
The new command option -march=armv8.2-a will enable the new ARMv8.2-A
feature macro, which is a superset of the ARMv8.1 features.
The new feature "fp16" can be enabled by -march=armv8.2-a+fp16 which
will enable ARMv8.2 FP16 extension support.
The feature macro __ARM_FEATURE_FP16_SCALAR_ARITHMETIC is defined to
be 1 if the scalar FP16 instructions are available, it is otherwise
undefined.
The feature macro __ARM_FEATURE_FP16_VECTOR_ARITHMETIC is defined to
be 1 if the vector FP16 instructions are available, it is otherwise
undefined.
OK for trunk?
Thanks.
2016-06-07 Matthew Wahab<[email protected]>
Jiong Wang<[email protected]>
* config/aarch64/aarch64-arches.def: Add "armv8.2-a".
* config/aarch64/aarch64.h (AARCH64_FL_V8_2): New.
(AARCH64_FL_F16): New.
(AARCH64_FL_FOR_ARCH8_2): New.
(AARCH64_ISA_8_2): New.
(AARCH64_ISA_F16): New.
(TARGET_FP_F16INST): New.
(TARGET_SIMD_F16INST): New.
* config/aarch64/aarch64-option-extensions.def: New entry for "fp16".
* config/aarch64/aarch64-c.c (arch64_update_cpp_builtins):
Conditionally define
__ARM_FEATURE_FP16_SCALAR_ARITHMETIC and
__ARM_FEATURE_FP16_VECTOR_ARITHMETIC.
* doc/invoke.texi (AArch64 Options): Document "armv8.2-a" and "fp16".
diff --git a/gcc/config/aarch64/aarch64-arches.def b/gcc/config/aarch64/aarch64-arches.def
index 1e9d90b1b66a21ebbe4c238ce844c6fd3a192201..7dcf140411f6eb95504d9b92df9dadce50529a28 100644
--- a/gcc/config/aarch64/aarch64-arches.def
+++ b/gcc/config/aarch64/aarch64-arches.def
@@ -32,4 +32,5 @@
AARCH64_ARCH("armv8-a", generic, 8A, 8, AARCH64_FL_FOR_ARCH8)
AARCH64_ARCH("armv8.1-a", generic, 8_1A, 8, AARCH64_FL_FOR_ARCH8_1)
+AARCH64_ARCH("armv8.2-a", generic, 8_2A, 8, AARCH64_FL_FOR_ARCH8_2)
diff --git a/gcc/config/aarch64/aarch64-c.c b/gcc/config/aarch64/aarch64-c.c
index e64dc7676ccae10e87ade3946904408fe425730d..3380ed6f2cd0ae35fd6a4e53177604256875e6de 100644
--- a/gcc/config/aarch64/aarch64-c.c
+++ b/gcc/config/aarch64/aarch64-c.c
@@ -95,6 +95,11 @@ aarch64_update_cpp_builtins (cpp_reader *pfile)
else
cpp_undef (pfile, "__ARM_FP");
+ aarch64_def_or_undef (TARGET_FP_F16INST,
+ "__ARM_FEATURE_FP16_SCALAR_ARITHMETIC", pfile);
+ aarch64_def_or_undef (TARGET_SIMD_F16INST,
+ "__ARM_FEATURE_FP16_VECTOR_ARITHMETIC", pfile);
+
aarch64_def_or_undef (TARGET_SIMD, "__ARM_FEATURE_NUMERIC_MAXMIN", pfile);
aarch64_def_or_undef (TARGET_SIMD, "__ARM_NEON", pfile);
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index e8706d1c2e798872b8028cce1d9d193df8fef0be..ff59dceabffe780adc84d953823800ba2abca5f3 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -55,3 +55,6 @@ AARCH64_OPT_EXTENSION("crc", AARCH64_FL_CRC, 0, 0, "crc32")
/* Enabling or disabling "lse" only changes "lse". */
AARCH64_OPT_EXTENSION("lse", AARCH64_FL_LSE, 0, 0, "atomics")
+
+/* Enabling or disabling "fp16" only changes "fp16". */
+AARCH64_OPT_EXTENSION("fp16", AARCH64_FL_F16, 0, 0, "fp16")
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 15d7e4019adf207d5127ebba31af35a8b3437c5b..a71420382069b66e2faef15c238f07374683b4fc 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -135,6 +135,8 @@ extern unsigned aarch64_architecture_version;
/* ARMv8.1 architecture extensions. */
#define AARCH64_FL_LSE (1 << 4) /* Has Large System Extensions. */
#define AARCH64_FL_V8_1 (1 << 5) /* Has ARMv8.1 extensions. */
+#define AARCH64_FL_V8_2 (1 << 8) /* Has ARMv8.2 features. */
+#define AARCH64_FL_F16 (1 << 9) /* Has ARMv8.2 FP16 extensions. */
/* Has FP and SIMD. */
#define AARCH64_FL_FPSIMD (AARCH64_FL_FP | AARCH64_FL_SIMD)
@@ -146,6 +148,8 @@ extern unsigned aarch64_architecture_version;
#define AARCH64_FL_FOR_ARCH8 (AARCH64_FL_FPSIMD)
#define AARCH64_FL_FOR_ARCH8_1 \
(AARCH64_FL_FOR_ARCH8 | AARCH64_FL_LSE | AARCH64_FL_CRC | AARCH64_FL_V8_1)
+#define AARCH64_FL_FOR_ARCH8_2 \
+ (AARCH64_FL_FOR_ARCH8_1 | AARCH64_FL_V8_2)
/* Macros to test ISA flags. */
@@ -155,6 +159,8 @@ extern unsigned aarch64_architecture_version;
#define AARCH64_ISA_SIMD (aarch64_isa_flags & AARCH64_FL_SIMD)
#define AARCH64_ISA_LSE (aarch64_isa_flags & AARCH64_FL_LSE)
#define AARCH64_ISA_RDMA (aarch64_isa_flags & AARCH64_FL_V8_1)
+#define AARCH64_ISA_V8_2 (aarch64_isa_flags & AARCH64_FL_V8_2)
+#define AARCH64_ISA_F16 (aarch64_isa_flags & AARCH64_FL_F16)
/* Crypto is an optional extension to AdvSIMD. */
#define TARGET_CRYPTO (TARGET_SIMD && AARCH64_ISA_CRYPTO)
@@ -165,6 +171,10 @@ extern unsigned aarch64_architecture_version;
/* Atomic instructions that can be enabled through the +lse extension. */
#define TARGET_LSE (AARCH64_ISA_LSE)
+/* ARMv8.2-A FP16 support that can be enabled through the +fp16 extension. */
+#define TARGET_FP_F16INST (TARGET_FLOAT && AARCH64_ISA_F16)
+#define TARGET_SIMD_F16INST (TARGET_SIMD && AARCH64_ISA_F16)
+
/* Make sure this is always defined so we don't have to check for ifdefs
but rather use normal ifs. */
#ifndef TARGET_FIX_ERR_A53_835769_DEFAULT
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index e9763d44d8d7aa6a64821a4b1811e55025aaaa4e..c4a6c7276eab38589f4e831982b071f12bd88665 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -12928,7 +12928,10 @@ more feature modifiers. This option has the form
@option{-march=@var{arch}@r{@{}+@r{[}no@r{]}@var{feature}@r{@}*}}.
The permissible values for @var{arch} are @samp{armv8-a},
-@samp{armv8.1-a} or @var{native}.
+@samp{armv8.1-a}, @samp{armv8.2-a} or @var{native}.
+
+The value @samp{armv8.2-a} implies @samp{armv8.1-a} and enables compiler
+support for the ARMv8.2 architecture extensions.
The value @samp{armv8.1-a} implies @samp{armv8-a} and enables compiler
support for the ARMv8.1 architecture extension. In particular, it
@@ -13041,6 +13044,8 @@ instructions. This is on by default for all possible values for options
@item lse
Enable Large System Extension instructions. This is on by default for
@option{-march=armv8.1-a}.
+@item fp16
+Enable FP16 extension.
@end table
