On 11/17/2022 11:17 AM, Lynne wrote:
Nov 17, 2022, 11:09 by an...@khirnov.net:
---
doc/developer.texi | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/doc/developer.texi b/doc/developer.texi
index 01735e07f5..44da6e41af 100644
--- a/doc/developer.texi
+++ b/doc/developer.texi
@@ -56,9 +56,9 @@ and should try to fix issues their commit causes.
@anchor{Coding Rules}
@chapter Coding Rules
-@section C language features
+@section Language
-FFmpeg is programmed in the ISO C99 language, extended with:
+FFmpeg is mainly programmed in the ISO C99 language, extended with:
@itemize @bullet
@item
Atomic operations from C11 @file{stdatomic.h}. They are emulated on
@@ -83,6 +83,17 @@ complex numbers;
mixed statements and declarations.
@end itemize
+Other languages than C may be used in special cases:
+@itemize @bullet
+@item
+NASM is preferred for x86 SIMD or other x86 assembly. Inline assembly and
+intrinsics should be avoided, unless there is a strong reason to use them (e.g.
+code that needs to be inlined).
We don't accept x86 intrinsics, so should isn't really appropriate.
Also, a word for other architectures would do.
Something like this maybe:
@item
NASM is required for x86 assembly. Inline assembly should be avoided,
unless there's a strong reason to use it (e.g. code that has to be inlined).
Intrinsics or other assembly flavours are not accepted for x86.
This is already not the case. See the stuff in libavutil/x86/intmath.h
Intrinsics are ok as long as they are single instructions for inlined
stuff, much like with inline asm.
Builtins are obviously preferred, but they tend to be GCC/Clang only and
at times limited in scope.
@item
For other architectures, GAS syntax should be used for assembly.
Inline assembly should be avoided, unless there's a good reason to use it.
Intrinsics are acceptable, but not recommended.
Other architectures also have different assembly syntax versions,
but it's so niche, it's not really worth mentioning.
Other patches look good.
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