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authorRémi Denis-Courmont <remi@remlab.net>2024-07-25 22:40:25 +0300
committerRémi Denis-Courmont <remi@remlab.net>2024-08-01 19:29:40 +0300
commitd86b6767ce98fda133e2b8f7f954a497eab2e528 (patch)
treeb8345aa2de35659c2395449e039764a4266965a0 /libavformat/subviewer1dec.c
parentd527d238728bf9b75d55960c4279134d0fba493b (diff)
downloadffmpeg-d86b6767ce98fda133e2b8f7f954a497eab2e528.tar.gz
lavc/audiodsp: properly unroll vector_clipf
Given that source and destination can alias, the compiler was forced to perform each read-modify-write sequentially. We cannot use the `restrict` qualifier to avoid this here because the AC-3 encoder uses the function in-place. Instead this commit provides an explicit guarantee to the compiler that batches of 8 elements will not overlap, so that it can interleave calculations. In practice contemporary optimising compilers are able to unroll and keep the temporary array in FPU registers (without spilling). On SiFive-U74, this speeds the same signs branch by 4x, and the opposite signs branch 1.5x.
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