| Message ID | 20210517095537.318311-1-martin@martin.st |
|---|---|
| State | Accepted |
| Commit | f27e3ccf06ee19935d160164ca4a02f28cfc2a27 |
| Headers | show |
| Series | [FFmpeg-devel] aarch64: hevc_idct: Fix overflows in idct_dc | expand |
| Context | Check | Description |
|---|---|---|
| andriy/x86_make | success | Make finished |
| andriy/x86_make_fate | success | Make fate finished |
| andriy/PPC64_make | success | Make finished |
| andriy/PPC64_make_fate | success | Make fate finished |
On Mon, 17 May 2021, Martin Storsjö wrote: > This is marginally slower, but correct for all input values. > The previous implementation failed with certain input seeds, e.g. > "checkasm --test=hevc_idct 98". > --- > libavcodec/aarch64/hevcdsp_idct_neon.S | 11 +++++------ > 1 file changed, 5 insertions(+), 6 deletions(-) OKd by Josh on irc (yesterday), will push soon. // Martin
diff --git a/libavcodec/aarch64/hevcdsp_idct_neon.S b/libavcodec/aarch64/hevcdsp_idct_neon.S index 28c11e632c..0869431294 100644 --- a/libavcodec/aarch64/hevcdsp_idct_neon.S +++ b/libavcodec/aarch64/hevcdsp_idct_neon.S @@ -573,14 +573,13 @@ idct_16x16 10 // void ff_hevc_idct_NxN_dc_DEPTH_neon(int16_t *coeffs) .macro idct_dc size, bitdepth function ff_hevc_idct_\size\()x\size\()_dc_\bitdepth\()_neon, export=1 - movi v1.8h, #((1 << (14 - \bitdepth))+1) ld1r {v4.8h}, [x0] - add v4.8h, v4.8h, v1.8h - sshr v0.8h, v4.8h, #(15 - \bitdepth) - sshr v1.8h, v4.8h, #(15 - \bitdepth) + srshr v4.8h, v4.8h, #1 + srshr v0.8h, v4.8h, #(14 - \bitdepth) + srshr v1.8h, v4.8h, #(14 - \bitdepth) .if \size > 4 - sshr v2.8h, v4.8h, #(15 - \bitdepth) - sshr v3.8h, v4.8h, #(15 - \bitdepth) + srshr v2.8h, v4.8h, #(14 - \bitdepth) + srshr v3.8h, v4.8h, #(14 - \bitdepth) .if \size > 16 /* dc 32x32 */ mov x2, #4 1: