Hi Richard,
On 06/12/2019 10:22, Richard Sandiford wrote:
> Dennis Zhang <dennis.zh...@arm.com> writes:
>> 2019-12-04 Dennis Zhang <dennis.zh...@arm.com>
>>
>> * config/aarch64/aarch64-arches.def (armv8.6-a): New.
>> * config/aarch64/aarch64-c.c (aarch64_update_cpp_builtins): Define
>> __ARM_FEATURE_MATMUL_INT8, __ARM_FEATURE_BF16_VECTOR_ARITHMETIC and
>> __ARM_FEATURE_BF16_SCALAR_ARITHMETIC when enabled.
>> * config/aarch64/aarch64-option-extensions.def (i8mm, bf16): New.
>> (fp): Disabling fp also disables i8mm and bf16.
>> (simd): Disabling simd also disables i8mm.
>> * config/aarch64/aarch64.h (AARCH64_FL_V8_6): New macro.
>> (AARCH64_FL_I8MM, AARCH64_FL_BF16, AARCH64_FL_FOR_ARCH8_6): Likewise.
>> (AARCH64_ISA_V8_6, AARCH64_ISA_I8MM, AARCH64_ISA_BF16): Likewise.
>> (TARGET_I8MM, TARGET_BF16_FP, TARGET_BF16_SIMD): Likewise.
>> * doc/invoke.texi (armv8.6-a, i8mm, bf16): Document new options. Add
>> a new table to list permissible values for ARCH.
>>
>> gcc/testsuite/ChangeLog:
>>
>> 2019-12-04 Dennis Zhang <dennis.zh...@arm.com>
>>
>> * gcc.target/aarch64/pragma_cpp_predefs_2.c: Add tests for i8mm
>> and bf16 features.
>
> Thanks for the update, looks great. A couple of comments below.
>
>> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
>> index d165f31a865..1192e8f4b06 100644
>> --- a/gcc/doc/invoke.texi
>> +++ b/gcc/doc/invoke.texi
>> @@ -16050,25 +16050,22 @@ Specify the name of the target architecture and,
>> optionally, one or
>> 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}, @samp{armv8.2-a}, @samp{armv8.3-a}, @samp{armv8.4-a},
>> -@samp{armv8.5-a} or @var{native}.
>> -
>> -The value @samp{armv8.5-a} implies @samp{armv8.4-a} and enables compiler
>> -support for the ARMv8.5-A architecture extensions.
>> -
>> -The value @samp{armv8.4-a} implies @samp{armv8.3-a} and enables compiler
>> -support for the ARMv8.4-A architecture extensions.
>> -
>> -The value @samp{armv8.3-a} implies @samp{armv8.2-a} and enables compiler
>> -support for the ARMv8.3-A architecture extensions.
>> -
>> -The value @samp{armv8.2-a} implies @samp{armv8.1-a} and enables compiler
>> -support for the ARMv8.2-A architecture extensions.
>> -
>> -The value @samp{armv8.1-a} implies @samp{armv8-a} and enables compiler
>> -support for the ARMv8.1-A architecture extension. In particular, it
>> -enables the @samp{+crc}, @samp{+lse}, and @samp{+rdma} features.
>> +The table below summarizes the permissible values for @var{arch}
>> +and the features that they enable by default:
>> +
>> +@multitable @columnfractions 0.20 0.20 0.60
>> +@headitem @var{arch} value @tab Architecture @tab Includes by default
>
> We should have an armv8-a entry here, something like:
>
> @item @samp{armv8-a} @tab Armv8-A @tab @samp{+fp}, @samp{+simd}
>
The armv8-a entry is added.
>> +@item @samp{armv8.1-a} @tab Armv8.1-A
>> +@tab @samp{armv8-a}, @samp{+crc}, @samp{+lse}, @samp{+rdma}
>> +@item @samp{armv8.2-a} @tab Armv8.2-A @tab @samp{armv8.1-a}
>> +@item @samp{armv8.3-a} @tab Armv8.3-A @tab @samp{armv8.2-a}
>> +@item @samp{armv8.4-a} @tab Armv8.4-A
>> +@tab @samp{armv8.3-a}, @samp{+fp16fml}, @samp{+dotprod}
>> +@item @samp{armv8.5-a} @tab Armv8.5-A
>> +@tab @samp{armv8.4-a}, @samp{+sb}, @samp{+ssbs}, @samp{+predres}
>> +@item @samp{armv8.6-a} @tab Armv8.6-A
>> +@tab @samp{armv8.5-a}, @samp{+bf16}, @samp{+i8mm}
>> +@end multitable
>
> I should have tried a proof of concept of this before suggesting it, sorry.
> Trying the patch locally I get:
>
> gcc.pod around line 18643: You can't have =items (as at line 18649) unless
> the first thing after the =over is an =item
> POD document had syntax errors at /usr/bin/pod2man line 71.
> Makefile:3363: recipe for target 'doc/gcc.1' failed
> make: [doc/gcc.1] Error 1 (ignored)
>
> (Odd that this is an ignored error, since we end up with an empty man page.)
>
> I've posted a texi2pod.pl patch for that:
>
> https://gcc.gnu.org/ml/gcc-patches/2019-12/msg00407.html
>
> However, even with that patch, the script needs the full table row to be
> on a single line, so I think we need to do that and live with the long lines.
>
The items are kept in a single line for each.
>> [...]
>> diff --git a/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_2.c
>> b/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_2.c
>> index 608b89d19ce..5ae39bc6cf0 100644
>> --- a/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_2.c
>> +++ b/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_2.c
>> @@ -13,6 +13,92 @@
>> #error "__ARM_FEATURE_TME is defined but should not be!"
>> #endif
>>
>> +/* Test Armv8.6-a features. */
>> +
>> +#pragma GCC push_options
>> +#pragma GCC target ("arch=armv8-a")
>
> These two pragmas should be at the beginning of the file, so that we
> start with base armv8-a for all the tests.
The pragmas are moved to the top.
The ChangeLog is updated as below:
gcc/ChangeLog:
2019-12-12 Dennis Zhang <dennis.zh...@arm.com>
* config/aarch64/aarch64-arches.def (armv8.6-a): New.
* config/aarch64/aarch64-c.c (aarch64_update_cpp_builtins): Define
__ARM_FEATURE_MATMUL_INT8, __ARM_FEATURE_BF16_VECTOR_ARITHMETIC and
__ARM_FEATURE_BF16_SCALAR_ARITHMETIC when enabled.
* config/aarch64/aarch64-option-extensions.def (i8mm, bf16): New.
(fp): Disabling fp also disables i8mm and bf16.
(simd): Disabling simd also disables i8mm.
* config/aarch64/aarch64.h (AARCH64_FL_V8_6): New macro.
(AARCH64_FL_I8MM, AARCH64_FL_BF16, AARCH64_FL_FOR_ARCH8_6): Likewise.
(AARCH64_ISA_V8_6, AARCH64_ISA_I8MM, AARCH64_ISA_BF16): Likewise.
(TARGET_I8MM, TARGET_BF16_FP, TARGET_BF16_SIMD): Likewise.
* doc/invoke.texi (armv8.6-a, i8mm, bf16): Document new options
and add a new table to list permissible values for ARCH.
gcc/testsuite/ChangeLog:
2019-12-12 Dennis Zhang <dennis.zh...@arm.com>
* gcc.target/aarch64/pragma_cpp_predefs_2.c: Add tests for i8mm
and bf16 features.
Many thanks!
Dennis
diff --git a/gcc/config/aarch64/aarch64-arches.def b/gcc/config/aarch64/aarch64-arches.def
index d258bd49244..e464d329c1a 100644
--- a/gcc/config/aarch64/aarch64-arches.def
+++ b/gcc/config/aarch64/aarch64-arches.def
@@ -36,5 +36,6 @@ AARCH64_ARCH("armv8.2-a", generic, 8_2A, 8, AARCH64_FL_FOR_ARCH8_2)
AARCH64_ARCH("armv8.3-a", generic, 8_3A, 8, AARCH64_FL_FOR_ARCH8_3)
AARCH64_ARCH("armv8.4-a", generic, 8_4A, 8, AARCH64_FL_FOR_ARCH8_4)
AARCH64_ARCH("armv8.5-a", generic, 8_5A, 8, AARCH64_FL_FOR_ARCH8_5)
+AARCH64_ARCH("armv8.6-a", generic, 8_6A, 8, AARCH64_FL_FOR_ARCH8_6)
#undef AARCH64_ARCH
diff --git a/gcc/config/aarch64/aarch64-c.c b/gcc/config/aarch64/aarch64-c.c
index f3da07fd28a..20d1e00552b 100644
--- a/gcc/config/aarch64/aarch64-c.c
+++ b/gcc/config/aarch64/aarch64-c.c
@@ -165,6 +165,12 @@ aarch64_update_cpp_builtins (cpp_reader *pfile)
aarch64_def_or_undef (TARGET_RNG, "__ARM_FEATURE_RNG", pfile);
aarch64_def_or_undef (TARGET_MEMTAG, "__ARM_FEATURE_MEMORY_TAGGING", pfile);
+ aarch64_def_or_undef (TARGET_I8MM, "__ARM_FEATURE_MATMUL_INT8", pfile);
+ aarch64_def_or_undef (TARGET_BF16_SIMD,
+ "__ARM_FEATURE_BF16_VECTOR_ARITHMETIC", pfile);
+ aarch64_def_or_undef (TARGET_BF16_FP,
+ "__ARM_FEATURE_BF16_SCALAR_ARITHMETIC", pfile);
+
/* Not for ACLE, but required to keep "float.h" correct if we switch
target between implementations that do or do not support ARMv8.2-A
16-bit floating-point extensions. */
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index d3ae1b2431b..52c0fb79f82 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -52,25 +52,27 @@
/* Enabling "fp" just enables "fp".
Disabling "fp" also disables "simd", "crypto", "fp16", "aes", "sha2",
- "sha3", sm3/sm4, "sve", "sve2", "sve2-aes", "sve2-sha3", "sve2-sm4", and
- "sve2-bitperm". */
+ "sha3", sm3/sm4, "sve", "sve2", "sve2-aes", "sve2-sha3", "sve2-sm4",
+ "sve2-bitperm", "i8mm" and "bf16". */
AARCH64_OPT_EXTENSION("fp", AARCH64_FL_FP, 0, AARCH64_FL_SIMD | \
AARCH64_FL_CRYPTO | AARCH64_FL_F16 | AARCH64_FL_AES | \
AARCH64_FL_SHA2 | AARCH64_FL_SHA3 | AARCH64_FL_SM4 | \
AARCH64_FL_SVE | AARCH64_FL_SVE2 | AARCH64_FL_SVE2_AES | \
AARCH64_FL_SVE2_SHA3 | AARCH64_FL_SVE2_SM4 | \
- AARCH64_FL_SVE2_BITPERM, false, "fp")
+ AARCH64_FL_SVE2_BITPERM | AARCH64_FL_I8MM | \
+ AARCH64_FL_BF16, false, "fp")
/* Enabling "simd" also enables "fp".
Disabling "simd" also disables "crypto", "dotprod", "aes", "sha2", "sha3",
- "sm3/sm4", "sve", "sve2", "sve2-aes", "sve2-sha3", "sve2-sm4", and
- "sve2-bitperm". */
+ "sm3/sm4", "sve", "sve2", "sve2-aes", "sve2-sha3", "sve2-sm4",
+ "sve2-bitperm", and "i8mm". */
AARCH64_OPT_EXTENSION("simd", AARCH64_FL_SIMD, AARCH64_FL_FP, \
AARCH64_FL_CRYPTO | AARCH64_FL_DOTPROD | \
AARCH64_FL_AES | AARCH64_FL_SHA2 | AARCH64_FL_SHA3 | \
AARCH64_FL_SM4 | AARCH64_FL_SVE | AARCH64_FL_SVE2 | \
AARCH64_FL_SVE2_AES | AARCH64_FL_SVE2_SHA3 | \
- AARCH64_FL_SVE2_SM4 | AARCH64_FL_SVE2_BITPERM, false, \
+ AARCH64_FL_SVE2_SM4 | AARCH64_FL_SVE2_BITPERM | \
+ AARCH64_FL_I8MM, false, \
"asimd")
/* Enabling "crypto" also enables "fp", "simd", "aes" and "sha2".
@@ -198,4 +200,14 @@ AARCH64_OPT_EXTENSION("sve2-bitperm", AARCH64_FL_SVE2_BITPERM, AARCH64_FL_SIMD |
/* Enabling or disabling "tme" only changes "tme". */
AARCH64_OPT_EXTENSION("tme", AARCH64_FL_TME, 0, 0, false, "")
+/* Enabling "i8mm" also enables "simd" and "fp".
+ Disabling "i8mm" only disables "i8mm". */
+AARCH64_OPT_EXTENSION("i8mm", AARCH64_FL_I8MM, \
+ AARCH64_FL_SIMD | AARCH64_FL_FP, 0, false, "i8mm")
+
+/* Enabling "bf16" also enables "simd" and "fp".
+ Disabling "bf16" only disables "bf16". */
+AARCH64_OPT_EXTENSION("bf16", AARCH64_FL_BF16, \
+ AARCH64_FL_SIMD | AARCH64_FL_FP, 0, false, "bf16")
+
#undef AARCH64_OPT_EXTENSION
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index ee01909abb9..2bb5a208720 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -202,6 +202,15 @@ extern unsigned aarch64_architecture_version;
/* Transactional Memory Extension. */
#define AARCH64_FL_TME (1ULL << 33) /* Has TME instructions. */
+/* Armv8.6-A architecture extensions. */
+#define AARCH64_FL_V8_6 (1ULL << 34)
+
+/* 8-bit Integer Matrix Multiply (I8MM) extensions. */
+#define AARCH64_FL_I8MM (1ULL << 35)
+
+/* Brain half-precision floating-point (BFloat16) Extension. */
+#define AARCH64_FL_BF16 (1ULL << 36)
+
/* Has FP and SIMD. */
#define AARCH64_FL_FPSIMD (AARCH64_FL_FP | AARCH64_FL_SIMD)
@@ -223,6 +232,9 @@ extern unsigned aarch64_architecture_version;
#define AARCH64_FL_FOR_ARCH8_5 \
(AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_V8_5 \
| AARCH64_FL_SB | AARCH64_FL_SSBS | AARCH64_FL_PREDRES)
+#define AARCH64_FL_FOR_ARCH8_6 \
+ (AARCH64_FL_FOR_ARCH8_5 | AARCH64_FL_V8_6 | AARCH64_FL_FPSIMD \
+ | AARCH64_FL_I8MM | AARCH64_FL_BF16)
/* Macros to test ISA flags. */
@@ -249,6 +261,9 @@ extern unsigned aarch64_architecture_version;
#define AARCH64_ISA_V8_5 (aarch64_isa_flags & AARCH64_FL_V8_5)
#define AARCH64_ISA_TME (aarch64_isa_flags & AARCH64_FL_TME)
#define AARCH64_ISA_MEMTAG (aarch64_isa_flags & AARCH64_FL_MEMTAG)
+#define AARCH64_ISA_V8_6 (aarch64_isa_flags & AARCH64_FL_V8_6)
+#define AARCH64_ISA_I8MM (aarch64_isa_flags & AARCH64_FL_I8MM)
+#define AARCH64_ISA_BF16 (aarch64_isa_flags & AARCH64_FL_BF16)
/* Crypto is an optional extension to AdvSIMD. */
#define TARGET_CRYPTO (TARGET_SIMD && AARCH64_ISA_CRYPTO)
@@ -308,6 +323,13 @@ extern unsigned aarch64_architecture_version;
/* Memory Tagging instructions optional to Armv8.5 enabled through +memtag. */
#define TARGET_MEMTAG (AARCH64_ISA_V8_5 && AARCH64_ISA_MEMTAG)
+/* I8MM instructions are enabled through +i8mm. */
+#define TARGET_I8MM (AARCH64_ISA_I8MM)
+
+/* BF16 instructions are enabled through +bf16. */
+#define TARGET_BF16_FP (AARCH64_ISA_BF16)
+#define TARGET_BF16_SIMD (AARCH64_ISA_BF16 && TARGET_SIMD)
+
/* 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 af3c7f2b910..f4619876318 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -16063,25 +16063,19 @@ Specify the name of the target architecture and, optionally, one or
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}, @samp{armv8.2-a}, @samp{armv8.3-a}, @samp{armv8.4-a},
-@samp{armv8.5-a} or @var{native}.
-
-The value @samp{armv8.5-a} implies @samp{armv8.4-a} and enables compiler
-support for the ARMv8.5-A architecture extensions.
-
-The value @samp{armv8.4-a} implies @samp{armv8.3-a} and enables compiler
-support for the ARMv8.4-A architecture extensions.
-
-The value @samp{armv8.3-a} implies @samp{armv8.2-a} and enables compiler
-support for the ARMv8.3-A architecture extensions.
-
-The value @samp{armv8.2-a} implies @samp{armv8.1-a} and enables compiler
-support for the ARMv8.2-A architecture extensions.
-
-The value @samp{armv8.1-a} implies @samp{armv8-a} and enables compiler
-support for the ARMv8.1-A architecture extension. In particular, it
-enables the @samp{+crc}, @samp{+lse}, and @samp{+rdma} features.
+The table below summarizes the permissible values for @var{arch}
+and the features that they enable by default:
+
+@multitable @columnfractions 0.20 0.20 0.60
+@headitem @var{arch} value @tab Architecture @tab Includes by default
+@item @samp{armv8-a} @tab Armv8-A @tab @samp{+fp}, @samp{+simd}
+@item @samp{armv8.1-a} @tab Armv8.1-A @tab @samp{armv8-a}, @samp{+crc}, @samp{+lse}, @samp{+rdma}
+@item @samp{armv8.2-a} @tab Armv8.2-A @tab @samp{armv8.1-a}
+@item @samp{armv8.3-a} @tab Armv8.3-A @tab @samp{armv8.2-a}
+@item @samp{armv8.4-a} @tab Armv8.4-A @tab @samp{armv8.3-a}, @samp{+fp16fml}, @samp{+dotprod}
+@item @samp{armv8.5-a} @tab Armv8.5-A @tab @samp{armv8.4-a}, @samp{+sb}, @samp{+ssbs}, @samp{+predres}
+@item @samp{armv8.6-a} @tab Armv8.6-A @tab @samp{armv8.5-a}, @samp{+bf16}, @samp{+i8mm}
+@end multitable
The value @samp{native} is available on native AArch64 GNU/Linux and
causes the compiler to pick the architecture of the host system. This
@@ -16296,6 +16290,7 @@ generation. This option is enabled by default for @option{-march=armv8.5-a}.
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}.
@item sve2
Enable the Armv8-a Scalable Vector Extension 2. This also enables SVE
instructions.
@@ -16307,9 +16302,18 @@ Enable SVE2 sm4 instructions. This also enables SVE2 instructions.
Enable SVE2 aes instructions. This also enables SVE2 instructions.
@item sve2-sha3
Enable SVE2 sha3 instructions. This also enables SVE2 instructions.
-@option{-march=armv8.5-a}.
@item tme
Enable the Transactional Memory Extension.
+@item i8mm
+Enable 8-bit Integer Matrix Multiply instructions. This also enables
+Advanced SIMD and floating-point instructions. This option is enabled by
+default for @option{-march=armv8.6-a}. Use of this option with architectures
+prior to Armv8.2-A is not supported.
+@item bf16
+Enable brain half-precision floating-point instructions. This also enables
+Advanced SIMD and floating-point instructions. This option is enabled by
+default for @option{-march=armv8.6-a}. Use of this option with architectures
+prior to Armv8.2-A is not supported.
@end table
diff --git a/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_2.c b/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_2.c
index 608b89d19ce..f61d635bd2a 100644
--- a/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_2.c
+++ b/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_2.c
@@ -1,6 +1,9 @@
/* { dg-do compile } */
/* { dg-options "-O2" } */
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8-a")
+
#pragma GCC push_options
#pragma GCC target ("arch=armv8-a+tme")
#ifndef __ARM_FEATURE_TME
@@ -13,6 +16,89 @@
#error "__ARM_FEATURE_TME is defined but should not be!"
#endif
+/* Test Armv8.6-A features. */
+
+#ifdef __ARM_FEATURE_MATMUL_INT8
+#error "__ARM_FEATURE_MATMUL_INT8 is defined but should not be!"
+#endif
+
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8.6-a")
+#ifndef __ARM_FEATURE_MATMUL_INT8
+#error "__ARM_FEATURE_MATMUL_INT8 is not defined but should be!"
+#endif
+#pragma GCC pop_options
+
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8.2-a+i8mm")
+#ifndef __ARM_FEATURE_MATMUL_INT8
+#error "__ARM_FEATURE_MATMUL_INT8 is not defined but should be!"
+#endif
+#pragma GCC pop_options
+
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8.6-a+nosimd")
+#ifdef __ARM_FEATURE_MATMUL_INT8
+#error "__ARM_FEATURE_MATMUL_INT8 is defined but should not be!"
+#endif
+#pragma GCC pop_options
+
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8.6-a+nofp")
+#ifdef __ARM_FEATURE_MATMUL_INT8
+#error "__ARM_FEATURE_MATMUL_INT8 is defined but should not be!"
+#endif
+#pragma GCC pop_options
+
+#ifdef __ARM_FEATURE_BF16_SCALAR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_SCALAR_ARITHMETIC is defined but should not be!"
+#endif
+#ifdef __ARM_FEATURE_BF16_VECTOR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_VECTOR_ARITHMETIC is defined but should not be!"
+#endif
+
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8.6-a")
+#ifndef __ARM_FEATURE_BF16_SCALAR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_SCALAR_ARITHMETIC is not defined but should be!"
+#endif
+#ifndef __ARM_FEATURE_BF16_VECTOR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_VECTOR_ARITHMETIC is not defined but should be!"
+#endif
+#pragma GCC pop_options
+
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8.2-a+bf16")
+#ifndef __ARM_FEATURE_BF16_SCALAR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_SCALAR_ARITHMETIC is not defined but should be!"
+#endif
+#ifndef __ARM_FEATURE_BF16_VECTOR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_VECTOR_ARITHMETIC is not defined but should be!"
+#endif
+#pragma GCC pop_options
+
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8.2-a+bf16+nosimd")
+#ifndef __ARM_FEATURE_BF16_SCALAR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_SCALAR_ARITHMETIC is not defined but should be!"
+#endif
+#ifdef __ARM_FEATURE_BF16_VECTOR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_VECTOR_ARITHMETIC is defined but should not be!"
+#endif
+#pragma GCC pop_options
+
+#pragma GCC push_options
+#pragma GCC target ("arch=armv8.6-a+nofp")
+#ifdef __ARM_FEATURE_BF16_SCALAR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_SCALAR_ARITHMETIC is defined but should not be!"
+#endif
+#ifdef __ARM_FEATURE_BF16_VECTOR_ARITHMETIC
+#error "__ARM_FEATURE_BF16_VECTOR_ARITHMETIC is defined but should not be!"
+#endif
+#pragma GCC pop_options
+
+#pragma GCC pop_options
+
int
foo (int a)
{
