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Given how, at present, the choice of using LSE128 atomic instructions by the toolchain is delegated to run-time selection in the form of Libatomic ifuncs, responsible for querying target support, the `+lse128' target architecture compile-time flag is absent from GCC. This, however, contrasts with the Binutils implementation, which gates LSE128 instructions behind the `+lse128' flag. This can lead to problems in GCC for certain use-cases. One such example is in the use of inline assembly, whereby the inability of enabling the feature in the command-line prevents the compiler from automatically issuing the necessary LSE128 `.arch' directive. This patch therefore brings GCC into alignment with LLVM and Binutils in adding support for the `+lse128' architectural extension flag. gcc/ChangeLog: * config/aarch64/aarch64-option-extensions.def: Add LSE128 AARCH64_OPT_EXTENSION, adding it as a dependency for the D128 feature. * doc/invoke.texi (AArch64 Options): Document +lse128. gcc/testsuite/ChangeLog: * gcc.target/aarch64/lse128-flag.c: New. * gcc.target/aarch64/cpunative/info_23: Likewise. * gcc.target/aarch64/cpunative/native_cpu_23.c: Likewise. |
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| libatomic | ||
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| libgm2 | ||
| libgo | ||
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This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.