From: "Rémi Denis-Courmont" <remi@remlab.net>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 4/5] lavu/intmath.h: Fix UB in ff_ctz_c() and ff_ctzll_c()
Date: Thu, 30 May 2024 10:54:46 +0300
Message-ID: <14560CCC-A959-44E7-A2E8-764DBE6478C0@remlab.net> (raw)
In-Reply-To: <0c19df65a8142e2cf96fbc07a92bf44bb32f1107.camel@haerdin.se>
Can't we just use the compiler built-ins here? AFAIK, they (GCC, LLVM) use the same algorithm if the CPU doesn't support native CTZ. And they will pick the right instruction if CPU does have CTZ.
I get it that maybe it wasn't working so well 20 years ago, but we've increased compiler version requirements since then.
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next prev parent reply other threads:[~2024-05-30 7:55 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-29 22:13 [FFmpeg-devel] [PATCH 1/5] lavu/common.h: Fix UB in av_clipl_int32_c() Tomas Härdin
2024-05-29 22:13 ` [FFmpeg-devel] [PATCH 2/5] lavu/common.h: Fix UB in av_clip_intp2_c() Tomas Härdin
2024-05-29 22:24 ` Andreas Rheinhardt
2024-05-29 23:08 ` Tomas Härdin
2024-05-29 22:14 ` [FFmpeg-devel] [PATCH 3/5] lavu/common.h: Fix UB in av_clip_uintp2_c() Tomas Härdin
2024-05-31 0:27 ` Michael Niedermayer
2024-05-29 22:14 ` [FFmpeg-devel] [PATCH 4/5] lavu/intmath.h: Fix UB in ff_ctz_c() and ff_ctzll_c() Tomas Härdin
2024-05-30 7:54 ` Rémi Denis-Courmont [this message]
2024-05-30 9:50 ` Tomas Härdin
2024-05-30 12:29 ` Hendrik Leppkes
2024-05-30 13:06 ` Rémi Denis-Courmont
2024-05-30 14:03 ` Tomas Härdin
2024-05-30 14:32 ` Rémi Denis-Courmont
2024-05-31 0:43 ` Ronald S. Bultje
2024-05-31 0:41 ` Michael Niedermayer
2024-05-31 5:48 ` Rémi Denis-Courmont
2024-05-31 0:31 ` Michael Niedermayer
2024-05-29 22:15 ` [FFmpeg-devel] [PATCH 5/5] lavu/mathematics: Return early if either a or b is zero Tomas Härdin
2024-05-31 0:22 ` Michael Niedermayer
2024-05-31 15:21 ` Tomas Härdin
2024-05-29 22:31 ` [FFmpeg-devel] [PATCH 1/5] lavu/common.h: Fix UB in av_clipl_int32_c() Andreas Rheinhardt
2024-05-30 9:48 ` Tomas Härdin
2024-05-30 6:41 ` Rémi Denis-Courmont
2024-05-30 9:40 ` Tomas Härdin
2024-05-30 11:50 ` Rémi Denis-Courmont
2024-05-30 14:07 ` Tomas Härdin
2024-05-30 14:28 ` Rémi Denis-Courmont
2024-05-30 15:32 ` Tomas Härdin
2024-05-30 15:38 ` Rémi Denis-Courmont
2024-05-31 1:03 ` Michael Niedermayer
2024-06-03 7:32 ` Rémi Denis-Courmont
2024-06-03 21:21 ` Michael Niedermayer
2024-05-30 15:42 ` James Almer
2024-05-30 16:48 ` Tomas Härdin
2024-05-30 17:49 ` Rémi Denis-Courmont
2024-05-30 19:07 ` Michael Niedermayer
2024-05-30 19:20 ` Rémi Denis-Courmont
2024-05-31 15:23 ` Tomas Härdin
2024-06-14 12:31 ` Tomas Härdin
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