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Code Issues Releases Activity

apv_decode: Replace division with shift

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The compiler can't see that this should be a shift and generates a real
division which is slow enough to appear in profiles on its own.
This commit is contained in:
Mark Thompson
2025-04-27 19:43:19 +01:00
parent 0b588bfb51
commit 585455f7b3
1 changed files with 6 additions and 6 deletions
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12
libavcodec/apv_decode.c
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@ -173,8 +173,8 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data,
const AVPixFmtDescriptor *pix_fmt_desc = const AVPixFmtDescriptor *pix_fmt_desc =
av_pix_fmt_desc_get(avctx->pix_fmt); av_pix_fmt_desc_get(avctx->pix_fmt);
int sub_w = comp_index == 0 ? 1 : pix_fmt_desc->log2_chroma_w + 1; int sub_w_shift = comp_index == 0 ? 0 : pix_fmt_desc->log2_chroma_w;
int sub_h = comp_index == 0 ? 1 : pix_fmt_desc->log2_chroma_h + 1; int sub_h_shift = comp_index == 0 ? 0 : pix_fmt_desc->log2_chroma_h;
APVRawTile *tile = &input->tile[tile_index]; APVRawTile *tile = &input->tile[tile_index];
@ -190,8 +190,8 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data,
int tile_mb_width = tile_width / APV_MB_WIDTH; int tile_mb_width = tile_width / APV_MB_WIDTH;
int tile_mb_height = tile_height / APV_MB_HEIGHT; int tile_mb_height = tile_height / APV_MB_HEIGHT;
int blk_mb_width = 2 / sub_w; int blk_mb_width = 2 >> sub_w_shift;
int blk_mb_height = 2 / sub_h; int blk_mb_height = 2 >> sub_h_shift;
int bit_depth; int bit_depth;
int qp_shift; int qp_shift;
@ -234,10 +234,10 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data,
for (int blk_x = 0; blk_x < blk_mb_width; blk_x++) { for (int blk_x = 0; blk_x < blk_mb_width; blk_x++) {
int frame_y = (tile_start_y + int frame_y = (tile_start_y +
APV_MB_HEIGHT * mb_y + APV_MB_HEIGHT * mb_y +
APV_TR_SIZE * blk_y) / sub_h; APV_TR_SIZE * blk_y) >> sub_h_shift;
int frame_x = (tile_start_x + int frame_x = (tile_start_x +
APV_MB_WIDTH * mb_x + APV_MB_WIDTH * mb_x +
APV_TR_SIZE * blk_x) / sub_w; APV_TR_SIZE * blk_x) >> sub_w_shift;
ptrdiff_t frame_pitch = apv->output_frame->linesize[comp_index]; ptrdiff_t frame_pitch = apv->output_frame->linesize[comp_index];
uint8_t *block_start = apv->output_frame->data[comp_index] + uint8_t *block_start = apv->output_frame->data[comp_index] +