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| author | JF Bastien <jfbastien@apple.com> | 2019-07-14 18:33:51 +0000 |
|---|---|---|
| committer | JF Bastien <jfbastien@apple.com> | 2019-07-14 18:33:51 +0000 |
| commit | fff5dc0b173fc35ce9a75a737a980875be125566 (patch) | |
| tree | 1281f77fbe8f2ebb67c69259a2e9374fb001ff21 /clang/docs/LanguageExtensions.rst | |
| parent | 24cacf9c56f0b55534e98941cc8675a9a7489c37 (diff) | |
| download | bcm5719-llvm-fff5dc0b173fc35ce9a75a737a980875be125566.tar.gz bcm5719-llvm-fff5dc0b173fc35ce9a75a737a980875be125566.zip | |
Support __seg_fs and __seg_gs on x86
Summary:
GCC supports named address spaces macros:
https://gcc.gnu.org/onlinedocs/gcc/Named-Address-Spaces.html
clang does as well with address spaces:
https://clang.llvm.org/docs/LanguageExtensions.html#memory-references-to-specified-segments
Add the __seg_fs and __seg_gs macros for compatibility with GCC.
<rdar://problem/52944935>
Subscribers: jkorous, dexonsmith, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D64676
llvm-svn: 366028
Diffstat (limited to 'clang/docs/LanguageExtensions.rst')
| -rw-r--r-- | clang/docs/LanguageExtensions.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst index ecbf04c3c82..266309c6ce2 100644 --- a/clang/docs/LanguageExtensions.rst +++ b/clang/docs/LanguageExtensions.rst @@ -2465,6 +2465,10 @@ Which compiles to (on X86-32): movl %gs:(%eax), %eax ret +You can also use the GCC compatibility macros ``__seg_fs`` and ``__seg_gs`` for +the same purpose. The preprocessor symbols ``__SEG_FS`` and ``__SEG_GS`` +indicate their support. + PowerPC Language Extensions ------------------------------ |
