From: "J. Dekker" <jdek@itanimul.li> To: ffmpeg-devel@ffmpeg.org Cc: Niklas Haas <git@haasn.dev> Subject: [FFmpeg-devel] [PATCH 5/7] avutil/riscv/asm: add helper macro to count varargs Date: Tue, 13 Aug 2024 16:03:34 +0200 Message-ID: <20240813140338.143045-5-jdek@itanimul.li> (raw) In-Reply-To: <20240813140338.143045-1-jdek@itanimul.li> From: Niklas Haas <git@haasn.dev> (Ab)using nested macros to get the number of arguments passed to a variadic macro. Useful for stack manipulation. --- libavutil/riscv/asm.S | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/libavutil/riscv/asm.S b/libavutil/riscv/asm.S index 175f2a8672..db190e99ca 100644 --- a/libavutil/riscv/asm.S +++ b/libavutil/riscv/asm.S @@ -271,3 +271,20 @@ #error Unhandled value of XLEN #endif .endm + + .macro count_args_inner num, arg, args:vararg + .ifb \arg + .equ num_args, \num + .else + count_args_inner \num + 1, \args + .endif + .endm + + /** + * Helper macro to count the number of arguments to a macro. Assigns + * the count to the symbol `num_args`. + * @param args arguments to count + */ + .macro count_args args:vararg + count_args_inner 0, \args + .endm -- 2.45.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
next prev parent reply other threads:[~2024-08-13 14:04 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-08-13 14:03 [FFmpeg-devel] [PATCH 1/7] checkasm: add csv/tsv bench output J. Dekker 2024-08-13 14:03 ` [FFmpeg-devel] [PATCH 2/7] checkasm: improve print format J. Dekker 2024-08-13 16:39 ` Lynne via ffmpeg-devel 2024-08-13 14:03 ` [FFmpeg-devel] [PATCH 3/7] checkasm: add wildcompares for test & functions J. Dekker 2024-08-13 14:03 ` [FFmpeg-devel] [PATCH 4/7] avutil/riscv/asm: add stack pushing helpers J. Dekker 2024-08-13 15:51 ` Rémi Denis-Courmont 2024-08-13 16:10 ` epirat07 2024-08-13 16:13 ` Rémi Denis-Courmont 2024-08-13 14:03 ` J. Dekker [this message] 2024-08-13 14:03 ` [FFmpeg-devel] [PATCH 6/7] avutil/riscv/asm: add generic push/pop helpers J. Dekker 2024-08-13 15:55 ` Rémi Denis-Courmont 2024-08-15 12:13 ` Niklas Haas 2024-08-13 14:03 ` [FFmpeg-devel] [PATCH 7/7] avcodec/riscv: add h264 qpel J. Dekker
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