x86: videodsp: Properly mark sse2 instructions in emulated_edge_mc as such.

Should fix crashes or corrupt output on pre-SSE2 CPUs when they were
using SSE2-code (e.g. AMD Athlon XP 2400+ or Intel Pentium III) in
hfix or hvar single-edge (left/right) extension functions.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>

libavcodec/x86/videodsp.asm

@@ -102,8 +102,8 @@ cglobal emu_edge_hvar, 5, 6, 1, dst, dst_stride, start_x, n_words, h, w
     imul             wd, 0x01010101             ;   w *= 0x01010101
     movd             m0, wd
     mov              wq, n_wordsq               ;   initialize w
-%if cpuflag(sse)
-    shufps           m0, m0, q0000              ;   splat
+%if cpuflag(sse2)
+    pshufd           m0, m0, q0000              ;   splat
 %else ; mmx
     punpckldq        m0, m0                     ;   splat
 %endif ; mmx/sse
@@ -124,7 +124,7 @@ INIT_MMX mmx
 hvar_fn
 %endif
 
-INIT_XMM sse
+INIT_XMM sse2
 hvar_fn
 
 ; macro to read/write a horizontal number of pixels (%2) to/from registers
@@ -137,42 +137,49 @@ hvar_fn
 ;         - if (%2 & 3)  fills 1, 2 or 4 bytes in eax
 ; writing data out is in the same way
 %macro READ_NUM_BYTES 2
-%assign %%off 0 ; offset in source buffer
-%assign %%idx 0 ; mmx/xmm register index
+%assign %%off 0     ; offset in source buffer
+%assign %%mmx_idx 0 ; mmx register index
+%assign %%xmm_idx 0 ; xmm register index
 
 %rep %2/mmsize
-    movu     m %+ %%idx, [srcq+%%off]
+%if mmsize == 16
+    movu   xmm %+ %%xmm_idx, [srcq+%%off]
+%assign %%xmm_idx %%xmm_idx+1
+%else ; mmx
+    movu    mm %+ %%mmx_idx, [srcq+%%off]
+%assign %%mmx_idx %%mmx_idx+1
+%endif
 %assign %%off %%off+mmsize
-%assign %%idx %%idx+1
 %endrep ; %2/mmsize
 
 %if mmsize == 16
 %if (%2-%%off) >= 8
 %if %2 > 16 && (%2-%%off) > 8
-    movu     m %+ %%idx, [srcq+%2-16]
+    movu   xmm %+ %%xmm_idx, [srcq+%2-16]
+%assign %%xmm_idx %%xmm_idx+1
 %assign %%off %2
 %else
-    movq     m %+ %%idx, [srcq+%%off]
+    movq    mm %+ %%mmx_idx, [srcq+%%off]
+%assign %%mmx_idx %%mmx_idx+1
 %assign %%off %%off+8
 %endif
-%assign %%idx %%idx+1
 %endif ; (%2-%%off) >= 8
 %endif
 
 %if (%2-%%off) >= 4
 %if %2 > 8 && (%2-%%off) > 4
-    movq     m %+ %%idx, [srcq+%2-8]
+    movq    mm %+ %%mmx_idx, [srcq+%2-8]
 %assign %%off %2
 %else
-    movd     m %+ %%idx, [srcq+%%off]
+    movd    mm %+ %%mmx_idx, [srcq+%%off]
 %assign %%off %%off+4
 %endif
-%assign %%idx %%idx+1
+%assign %%mmx_idx %%mmx_idx+1
 %endif ; (%2-%%off) >= 4
 
 %if (%2-%%off) >= 1
 %if %2 >= 4
-    movd     m %+ %%idx, [srcq+%2-4]
+    movd mm %+ %%mmx_idx, [srcq+%2-4]
 %elif (%2-%%off) == 1
     mov            valb, [srcq+%2-1]
 %elif (%2-%%off) == 2
@@ -180,48 +187,55 @@ hvar_fn
 %elifidn %1, body
     mov            vald, [srcq+%2-3]
 %else
-    movd     m %+ %%idx, [srcq+%2-3]
+    movd mm %+ %%mmx_idx, [srcq+%2-3]
 %endif
 %endif ; (%2-%%off) >= 1
 %endmacro ; READ_NUM_BYTES
 
 %macro WRITE_NUM_BYTES 2
-%assign %%off 0 ; offset in destination buffer
-%assign %%idx 0 ; mmx/xmm register index
+%assign %%off 0     ; offset in destination buffer
+%assign %%mmx_idx 0 ; mmx register index
+%assign %%xmm_idx 0 ; xmm register index
 
 %rep %2/mmsize
-    movu   [dstq+%%off], m %+ %%idx
+%if mmsize == 16
+    movu   [dstq+%%off], xmm %+ %%xmm_idx
+%assign %%xmm_idx %%xmm_idx+1
+%else ; mmx
+    movu   [dstq+%%off], mm %+ %%mmx_idx
+%assign %%mmx_idx %%mmx_idx+1
+%endif
 %assign %%off %%off+mmsize
-%assign %%idx %%idx+1
 %endrep ; %2/mmsize
 
 %if mmsize == 16
 %if (%2-%%off) >= 8
 %if %2 > 16 && (%2-%%off) > 8
-    movu   [dstq+%2-16], m %+ %%idx
+    movu   [dstq+%2-16], xmm %+ %%xmm_idx
+%assign %%xmm_idx %%xmm_idx+1
 %assign %%off %2
 %else
-    movq   [dstq+%%off], m %+ %%idx
+    movq   [dstq+%%off], mm %+ %%mmx_idx
+%assign %%mmx_idx %%mmx_idx+1
 %assign %%off %%off+8
 %endif
-%assign %%idx %%idx+1
 %endif ; (%2-%%off) >= 8
 %endif
 
 %if (%2-%%off) >= 4
 %if %2 > 8 && (%2-%%off) > 4
-    movq    [dstq+%2-8], m %+ %%idx
+    movq    [dstq+%2-8], mm %+ %%mmx_idx
 %assign %%off %2
 %else
-    movd   [dstq+%%off], m %+ %%idx
+    movd   [dstq+%%off], mm %+ %%mmx_idx
 %assign %%off %%off+4
 %endif
-%assign %%idx %%idx+1
+%assign %%mmx_idx %%mmx_idx+1
 %endif ; (%2-%%off) >= 4
 
 %if (%2-%%off) >= 1
 %if %2 >= 4
-    movd    [dstq+%2-4], m %+ %%idx
+    movd    [dstq+%2-4], mm %+ %%mmx_idx
 %elif (%2-%%off) == 1
     mov     [dstq+%2-1], valb
 %elif (%2-%%off) == 2
@@ -231,7 +245,7 @@ hvar_fn
     shr            vald, 16
     mov     [dstq+%2-1], valb
 %else
-    movd           vald, m %+ %%idx
+    movd           vald, mm %+ %%mmx_idx
     mov     [dstq+%2-3], valw
     shr            vald, 16
     mov     [dstq+%2-1], valb
@@ -339,7 +353,7 @@ VERTICAL_EXTEND 16, 22
 %if %1 >= 8
     movd             m0, vald
 %if mmsize == 16
-    shufps           m0, m0, q0000
+    pshufd           m0, m0, q0000
 %else
     punpckldq        m0, m0
 %endif
@@ -409,7 +423,7 @@ H_EXTEND 2, 14
 H_EXTEND 16, 22
 %endif
 
-INIT_XMM sse
+INIT_XMM sse2
 H_EXTEND 16, 22
 
 %macro PREFETCH_FN 1

libavcodec/x86/videodsp_init.c

@@ -115,17 +115,17 @@ static emu_edge_hfix_func *hfixtbl_mmx[11] = {
 };
 #endif
 extern emu_edge_hvar_func ff_emu_edge_hvar_mmx;
-extern emu_edge_hfix_func ff_emu_edge_hfix16_sse;
-extern emu_edge_hfix_func ff_emu_edge_hfix18_sse;
-extern emu_edge_hfix_func ff_emu_edge_hfix20_sse;
-extern emu_edge_hfix_func ff_emu_edge_hfix22_sse;
-static emu_edge_hfix_func *hfixtbl_sse[11] = {
+extern emu_edge_hfix_func ff_emu_edge_hfix16_sse2;
+extern emu_edge_hfix_func ff_emu_edge_hfix18_sse2;
+extern emu_edge_hfix_func ff_emu_edge_hfix20_sse2;
+extern emu_edge_hfix_func ff_emu_edge_hfix22_sse2;
+static emu_edge_hfix_func *hfixtbl_sse2[11] = {
     ff_emu_edge_hfix2_mmx,  ff_emu_edge_hfix4_mmx,  ff_emu_edge_hfix6_mmx,
     ff_emu_edge_hfix8_mmx,  ff_emu_edge_hfix10_mmx, ff_emu_edge_hfix12_mmx,
-    ff_emu_edge_hfix14_mmx, ff_emu_edge_hfix16_sse, ff_emu_edge_hfix18_sse,
-    ff_emu_edge_hfix20_sse, ff_emu_edge_hfix22_sse
+    ff_emu_edge_hfix14_mmx, ff_emu_edge_hfix16_sse2, ff_emu_edge_hfix18_sse2,
+    ff_emu_edge_hfix20_sse2, ff_emu_edge_hfix22_sse2
 };
-extern emu_edge_hvar_func ff_emu_edge_hvar_sse;
+extern emu_edge_hvar_func ff_emu_edge_hvar_sse2;
 
 static av_always_inline void emulated_edge_mc(uint8_t *dst, const uint8_t *src,
                                               ptrdiff_t dst_stride,
@@ -211,7 +211,6 @@ static av_noinline void emulated_edge_mc_mmx(uint8_t *buf, const uint8_t *src,
                      src_x, src_y, w, h, vfixtbl_mmx, &ff_emu_edge_vvar_mmx,
                      hfixtbl_mmx, &ff_emu_edge_hvar_mmx);
 }
-#endif
 
 static av_noinline void emulated_edge_mc_sse(uint8_t * buf,const uint8_t *src,
                                              ptrdiff_t buf_stride,
@@ -221,7 +220,20 @@ static av_noinline void emulated_edge_mc_sse(uint8_t * buf,const uint8_t *src,
 {
     emulated_edge_mc(buf, src, buf_stride, src_stride, block_w, block_h,
                      src_x, src_y, w, h, vfixtbl_sse, &ff_emu_edge_vvar_sse,
-                     hfixtbl_sse, &ff_emu_edge_hvar_sse);
+                     hfixtbl_mmx, &ff_emu_edge_hvar_mmx);
+}
+#endif
+
+static av_noinline void emulated_edge_mc_sse2(uint8_t *buf, const uint8_t *src,
+                                              ptrdiff_t buf_stride,
+                                              ptrdiff_t src_stride,
+                                              int block_w, int block_h,
+                                              int src_x, int src_y, int w,
+                                              int h)
+{
+    emulated_edge_mc(buf, src, buf_stride, src_stride, block_w, block_h, src_x,
+                     src_y, w, h, vfixtbl_sse, &ff_emu_edge_vvar_sse,
+                     hfixtbl_sse2, &ff_emu_edge_hvar_sse2);
 }
 #endif /* HAVE_YASM */
 
@@ -244,8 +256,13 @@ av_cold void ff_videodsp_init_x86(VideoDSPContext *ctx, int bpc)
     if (EXTERNAL_MMXEXT(cpu_flags)) {
         ctx->prefetch = ff_prefetch_mmxext;
     }
+#if ARCH_X86_32
     if (EXTERNAL_SSE(cpu_flags) && bpc <= 8) {
         ctx->emulated_edge_mc = emulated_edge_mc_sse;
     }
+#endif /* ARCH_X86_32 */
+    if (EXTERNAL_SSE2(cpu_flags) && bpc <= 8) {
+        ctx->emulated_edge_mc = emulated_edge_mc_sse2;
+    }
 #endif /* HAVE_YASM */
 }