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| author | David Woodhouse <dwmw2@infradead.org> | 2014-01-23 14:32:46 +0000 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2014-01-23 14:32:46 +0000 |
| commit | c97dfe1b1d8195248085a23b9a918adb87efb35d (patch) | |
| tree | fcf42743e5e4296758afa77e9f6eb3a03eb1ada4 /docs/UsersManual.rst | |
| parent | 7950014000af728b6dbd0c0be2668b926fe86c0b (diff) | |
| download | clang-c97dfe1b1d8195248085a23b9a918adb87efb35d.tar.gz clang-c97dfe1b1d8195248085a23b9a918adb87efb35d.tar.bz2 clang-c97dfe1b1d8195248085a23b9a918adb87efb35d.tar.xz | |
Add documentation for -m16 option on X86, fix typo
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199894 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/UsersManual.rst')
| -rw-r--r-- | docs/UsersManual.rst | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/docs/UsersManual.rst b/docs/UsersManual.rst index fb5cda5059..d832f99bae 100644 --- a/docs/UsersManual.rst +++ b/docs/UsersManual.rst @@ -1329,9 +1329,16 @@ to correctly compile many large C, C++, Objective-C, and Objective-C++ codebases. On ``x86_64-mingw32``, passing i128(by value) is incompatible with the -Microsoft x64 calling conversion. You might need to tweak +Microsoft x64 calling convention. You might need to tweak ``WinX86_64ABIInfo::classify()`` in lib/CodeGen/TargetInfo.cpp. +For the X86 target, clang supports the :option:`-m16` command line +argument which enables 16-bit code output. This is broadly similar to +using ``asm(".code16gcc")`` with the GNU toolchain. The generated code +and the ABI remains 32-bit but the assembler emits instructions +appropriate for a CPU running in 16-bit mode, with address-size and +operand-size prefixes to enable 32-bit addressing and operations. + ARM ^^^ |