diff options
| author | Andre Vieira <andre.simoesdiasvieira@arm.com> | 2022-11-15 09:50:39 +0000 |
|---|---|---|
| committer | Andre Vieira <andre.simoesdiasvieira@arm.com> | 2022-11-15 09:50:39 +0000 |
| commit | 0431e8ae5bdb854bda5f9005e41c8c4d03f6d74e (patch) | |
| tree | b65df33fbe1c4b36a63276d5e48037ac3c25fa78 /gcc/doc/invoke.texi | |
| parent | 9a4129f5c5a697ad7726687d5932eef90feec53b (diff) | |
aarch64: Enable the use of LDAPR for load-acquire semantics
This patch enables the use of LDAPR for load-acquire semantics.
2022-11-15 Andre Vieira <andre.simoesdiasvieira@arm.com>
Kyrylo Tkachov <kyrylo.tkachov@arm.com>
gcc/ChangeLog:
* config/aarch64/aarch64.h (AARCH64_ISA_RCPC): New Macro.
(TARGET_RCPC): New Macro.
* config/aarch64/atomics.md (atomic_load<mode>): Change into an expand.
(aarch64_atomic_load<mode>_rcpc): New define_insn for ldapr.
(aarch64_atomic_load<mode>): Rename of old define_insn for ldar.
* config/aarch64/iterators.md (UNSPEC_LDAP): New unspec enum value.
* doc/invoke.texi (rcpc): Ammend documentation to mention the effects
on code generation.
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/ldapr.c: New test.
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 55e8a14fecd..9d733948bdb 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -20147,9 +20147,9 @@ Enable FP16 fmla extension. This also enables FP16 extensions and floating-point instructions. This option is enabled by default for @option{-march=armv8.4-a}. Use of this option with architectures prior to Armv8.2-A is not supported. @item rcpc -Enable the RcPc extension. This does not change code generation from GCC, -but is passed on to the assembler, enabling inline asm statements to use -instructions from the RcPc extension. +Enable the RCpc extension. This enables the use of the LDAPR instructions for +load-acquire atomic semantics, and passes it on to the assembler, enabling +inline asm statements to use instructions from the RCpc extension. @item dotprod Enable the Dot Product extension. This also enables Advanced SIMD instructions. @item aes |