From: Fiona Glaser <fiona@x264.com>
Date: Tue, 10 Nov 2009 05:22:41 +0000 (-0800)
Subject: Fix one (of possibly many) miscompilations in weightp
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3a4c7dae3deeeb729251e1098d70befab1ad4a0e;p=libx264

Fix one (of possibly many) miscompilations in weightp
Use NOINLINE and some emms calls to fix emms reordering issues.
This issue occurred with some GCC versions if threads > 1 and the phase of the moon was right.
Also a cosmetic in x264.c.
---

diff --git a/encoder/slicetype.c b/encoder/slicetype.c
index 9323981a..9c65d03d 100644
--- a/encoder/slicetype.c
+++ b/encoder/slicetype.c
@@ -59,7 +59,7 @@ static void get_h264_weight( unsigned int weight_nonh264, int offset, x264_weigh
 /* due to a GCC bug on some platforms (win32), flat[16] may not actually be aligned. */
 ALIGNED_16( static uint8_t flat[17] ) = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
 
-static void weights_plane_analyse( x264_t *h, uint8_t *plane, int width, int height, int stride, unsigned int *sum, uint64_t *var )
+static NOINLINE void weights_plane_analyse( x264_t *h, uint8_t *plane, int width, int height, int stride, unsigned int *sum, uint64_t *var )
 {
     int x,y;
     unsigned int sad = 0;
@@ -85,7 +85,7 @@ static void weights_plane_analyse( x264_t *h, uint8_t *plane, int width, int hei
    (dst)[3] = &(src)[3][i_pel_offset]; \
 }
 
-static uint8_t *x264_weight_cost_init_luma( x264_t *h, x264_frame_t *fenc, x264_frame_t *ref, uint8_t *dest, int b_lowres )
+static NOINLINE uint8_t *x264_weight_cost_init_luma( x264_t *h, x264_frame_t *fenc, x264_frame_t *ref, uint8_t *dest, int b_lowres )
 {
     uint8_t **ref_planes = b_lowres ? ref->lowres : ref->filtered;
     int ref0_distance = fenc->i_frame - ref->i_frame - 1;
@@ -114,13 +114,15 @@ static uint8_t *x264_weight_cost_init_luma( x264_t *h, x264_frame_t *fenc, x264_
                 h->mc.mc_luma( pix, i_stride, src, i_stride,
                                mvx, mvy, mbsize, mbsize, weight_none );
             }
+        x264_emms();
         return dest;
     }
+    x264_emms();
     return ref_planes[0];
 }
 #undef LOAD_HPELS_LUMA
 
-static unsigned int x264_weight_cost( x264_t *h, x264_frame_t *fenc, uint8_t *src, x264_weight_t *w, int b_lowres )
+static NOINLINE unsigned int x264_weight_cost( x264_t *h, x264_frame_t *fenc, uint8_t *src, x264_weight_t *w, int b_lowres )
 {
     int x, y;
     unsigned int cost = 0;
@@ -160,6 +162,7 @@ static unsigned int x264_weight_cost( x264_t *h, x264_frame_t *fenc, uint8_t *sr
         // Multiply by 2 as there will be a duplicate. 10 bits added as if there is a weighted frame, then an additional duplicate is used.
         cost += lambda * numslices * ( 10 + 2 * ( bs_size_ue( w[0].i_denom ) + bs_size_se( w[0].i_scale ) + bs_size_se( w[0].i_offset ) ) );
     }
+    x264_emms();
     return cost;
 }
 
diff --git a/x264.c b/x264.c
index dbad1ff4..115e66aa 100644
--- a/x264.c
+++ b/x264.c
@@ -273,10 +273,10 @@ static void Help( x264_param_t *defaults, int longhelp )
         "                                  - none, spatial, temporal, auto\n",
                                        strtable_lookup( x264_direct_pred_names, defaults->analyse.i_direct_mv_pred ) );
     H2( "      --no-weightb            Disable weighted prediction for B-frames\n" );
-    H1( "      --weightp               Weighted prediction for P-frames [2]\n"
+    H1( "      --weightp               Weighted prediction for P-frames [%d]\n"
         "                              - 0: Disabled\n"
         "                              - 1: Blind offset\n"
-        "                              - 2: Smart analysis\n");
+        "                              - 2: Smart analysis\n", defaults->analyse.i_weighted_pred );
     H1( "      --me <string>           Integer pixel motion estimation method [\"%s\"]\n",
                                        strtable_lookup( x264_motion_est_names, defaults->analyse.i_me_method ) );
     H2( "                                  - dia: diamond search, radius 1 (fast)\n"