[FFmpeg-cvslog] avutil/tx_template: Don't waste space for inexistent factors

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Sat Oct 22 14:23:07 2022 +0200| [2af5f55b2e28d3ac4f055aacba3700075268164f] | committer: Andreas Rheinhardt

avutil/tx_template: Don't waste space for inexistent factors

It is possible to avoid the factors array for the power-of-two
tables for which said array is unused by using a different
structure for initialization for power-of-two tables than for
non-power-of-two-tables. This saves 3*15*16B from .data.

Reviewed-by: Lynne <dev at lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2af5f55b2e28d3ac4f055aacba3700075268164f
---

 libavutil/tx_template.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/libavutil/tx_template.c b/libavutil/tx_template.c
index 6b63cc575f..b44a6189cc 100644
--- a/libavutil/tx_template.c
+++ b/libavutil/tx_template.c
@@ -55,9 +55,14 @@ TABLE_DEF( 9,  8);
 typedef struct FFSRTabsInitOnce {
     void (*func)(void);
     AVOnce control;
-    int factors[TX_MAX_SUB]; /* Must be sorted high -> low */
 } FFSRTabsInitOnce;
 
+typedef struct FFSRTabsInitOnceExt {
+    void (*func)(void);
+    AVOnce control;
+    int factors[TX_MAX_SUB]; /* Must be sorted high -> low */
+} FFSRTabsInitOnceExt;
+
 #define INIT_FF_SR_TAB(len)                                        \
 static av_cold void TX_TAB(ff_tx_init_tab_ ##len)(void)            \
 {                                                                  \
@@ -145,7 +150,7 @@ static av_cold void TX_TAB(ff_tx_init_tab_9)(void)
     TX_TAB(ff_tx_tab_9)[7] = TX_TAB(ff_tx_tab_9)[3] - TX_TAB(ff_tx_tab_9)[4];
 }
 
-static FFSRTabsInitOnce nptwo_tabs_init_once[] = {
+static FFSRTabsInitOnceExt nptwo_tabs_init_once[] = {
     { TX_TAB(ff_tx_init_tab_53),      AV_ONCE_INIT, { 15, 5, 3 } },
     { TX_TAB(ff_tx_init_tab_9),       AV_ONCE_INIT, {  9 }       },
     { TX_TAB(ff_tx_init_tab_7),       AV_ONCE_INIT, {  7 }       },