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| author | Tamar Christina <tamar.christina@arm.com> | 2017-11-17 15:53:51 +0000 |
|---|---|---|
| committer | Tamar Christina <tnfchris@gcc.gnu.org> | 2017-11-17 15:53:51 +0000 |
| commit | ec132ef20c94c5bc72cdf27138cdff2e0c96800e (patch) | |
| tree | 66a6b83e440593a102ad9a175aebacd673e801b5 /gcc/doc | |
| parent | 6e72eb34e279a97e997b59494f8d47170efb03be (diff) | |
| download | gcc-ec132ef20c94c5bc72cdf27138cdff2e0c96800e.zip gcc-ec132ef20c94c5bc72cdf27138cdff2e0c96800e.tar.gz gcc-ec132ef20c94c5bc72cdf27138cdff2e0c96800e.tar.bz2 | |
re PR target/82641 (Unable to enable crc32 for a certain function with target attribute on ARM (aarch32))
2017-11-17 Tamar Christina <tamar.christina@arm.com>
PR target/82641
* config/arm/arm.c (arm_valid_target_attribute_rec):
Parse "arch=" and "+<ext>".
(arm_valid_target_attribute_tree): Re-init global options.
(arm_option_override): Make non-static.
(arm_options_perform_arch_sanity_checks): Make errors fatal.
* gcc/config/arm/arm-c.c (__ARM_FEATURE_CMSE): Support undef.
(__ARM_FEATURE_CRC32): Support undef.
* config/arm/arm_acle.h (__ARM_FEATURE_CRC32): Replace with pragma.
* doc/extend.texi (ARM Function Attributes): Add pragma and target.
gcc/testsuite/
2017-11-17 Tamar Christina <tamar.christina@arm.com>
PR target/82641
* gcc.target/arm/pragma_arch_attribute.c: New.
From-SVN: r254878
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/extend.texi | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 711264c..50bda91 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -3858,6 +3858,40 @@ Specifies the fpu for which to tune the performance of this function. The behavior and permissible arguments are the same as for the @option{-mfpu=} command-line option. +@item arch= +@cindex @code{arch=} function attribute, ARM +Specifies the architecture version and architectural extensions to use +for this function. The behavior and permissible arguments are the same as +for the @option{-march=} command-line option. + +The above target attributes can be specified as follows: + +@smallexample +__attribute__((target("arch=armv8-a+crc"))) +int +f (int a) +@{ + return a + 5; +@} +@end smallexample + +Additionally, the architectural extension string may be specified on its +own. This can be used to turn on and off particular architectural extensions +without having to specify a particular architecture version or core. Example: + +@smallexample +__attribute__((target("+crc+nocrypto"))) +int +foo (int a) +@{ + return a + 5; +@} +@end smallexample + +In this example @code{target("+crc+nocrypto")} enables the @code{crc} +extension and disables the @code{crypto} extension for the function @code{foo} +without modifying an existing @option{-march=} or @option{-mcpu} option. + @end table @end table |