x86: better share ff_pw_2

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/x86/constants.c

@@ -22,8 +22,6 @@
 #include "libavutil/x86/asm.h" // for xmm_reg
 #include "constants.h"
 
-DECLARE_ALIGNED(8,  const uint64_t, ff_wtwo) = 0x0002000200020002ULL;
-
 DECLARE_ALIGNED(16, const xmm_reg,  ff_pw_1)    = { 0x0001000100010001ULL, 0x0001000100010001ULL };
 DECLARE_ALIGNED(16, const xmm_reg,  ff_pw_2)    = { 0x0002000200020002ULL, 0x0002000200020002ULL };
 DECLARE_ALIGNED(16, const xmm_reg,  ff_pw_3)    = { 0x0003000300030003ULL, 0x0003000300030003ULL };

libavcodec/x86/constants.h

@@ -25,8 +25,7 @@
 
 #include "libavutil/x86/asm.h"
 
-extern const uint64_t ff_wtwo;
-
+extern const xmm_reg  ff_pw_2;
 extern const xmm_reg  ff_pw_3;
 extern const xmm_reg  ff_pw_4;
 extern const xmm_reg  ff_pw_5;

libavcodec/x86/dwt_yasm.asm

@@ -23,11 +23,12 @@
 
 SECTION_RODATA
 pw_1: times 8 dw 1
-pw_2: times 8 dw 2
 pw_8: times 8 dw 8
 pw_16: times 8 dw 16
 pw_1991: times 4 dw 9,-1
 
+cextern pw_2
+
 section .text
 
 ; %1 -= (%2 + %3 + 2)>>2     %4 is pw_2

libavcodec/x86/inline_asm.h

@@ -37,7 +37,7 @@
         "paddb   %%"#regd", %%"#regd"   \n\t" ::)
 
 #ifndef PIC
-#define MOVQ_WTWO(regd) __asm__ volatile ("movq %0, %%"#regd" \n\t" :: "m"(ff_wtwo))
+#define MOVQ_WTWO(regd) __asm__ volatile ("movq %0, %%"#regd" \n\t" :: "m"(ff_pw_2))
 #else
 // for shared library it's better to use this way for accessing constants
 // pcmpeqd -> -1