diff --git a/libavcodec/alpha/dsputil_alpha_asm.S b/libavcodec/alpha/dsputil_alpha_asm.S
index 5c5f90a989..d801bcf5ce 100644
--- a/libavcodec/alpha/dsputil_alpha_asm.S
+++ b/libavcodec/alpha/dsputil_alpha_asm.S
@@ -26,17 +26,6 @@
 
 #include "regdef.h"
 
-/* Some nicer register names.  */
-#define ta t10
-#define tb t11
-#define tc t12
-#define td AT
-/* Danger: these overlap with the argument list and the return value */
-#define te a5
-#define tf a4
-#define tg a3
-#define th v0
-
         .set noat
         .set noreorder
         .arch pca56
diff --git a/libavcodec/alpha/hpeldsp_alpha.c b/libavcodec/alpha/hpeldsp_alpha.c
index 9a092f57de..8d54807d8f 100644
--- a/libavcodec/alpha/hpeldsp_alpha.c
+++ b/libavcodec/alpha/hpeldsp_alpha.c
@@ -19,6 +19,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/attributes.h"
 #include "libavcodec/hpeldsp.h"
 #include "hpeldsp_alpha.h"
 #include "asm.h"
@@ -173,7 +174,7 @@ static void put_pixels16_axp_asm(uint8_t *block, const uint8_t *pixels,
     put_pixels_axp_asm(block + 8, pixels + 8, line_size, h);
 }
 
-void ff_hpeldsp_init_alpha(HpelDSPContext* c, int flags)
+av_cold void ff_hpeldsp_init_alpha(HpelDSPContext *c, int flags)
 {
     c->put_pixels_tab[0][0] = put_pixels16_axp_asm;
     c->put_pixels_tab[0][1] = put_pixels16_x2_axp;
diff --git a/libavcodec/alpha/hpeldsp_alpha.h b/libavcodec/alpha/hpeldsp_alpha.h
index 53e8604acd..985182c67b 100644
--- a/libavcodec/alpha/hpeldsp_alpha.h
+++ b/libavcodec/alpha/hpeldsp_alpha.h
@@ -20,6 +20,7 @@
 #define AVCODEC_ALPHA_HPELDSP_ALPHA_H
 
 #include <stdint.h>
+#include <stddef.h>
 
 void put_pixels_axp_asm(uint8_t *block, const uint8_t *pixels,
                         ptrdiff_t line_size, int h);
diff --git a/libavcodec/alpha/hpeldsp_alpha_asm.S b/libavcodec/alpha/hpeldsp_alpha_asm.S
index afc3d423eb..df386c429e 100644
--- a/libavcodec/alpha/hpeldsp_alpha_asm.S
+++ b/libavcodec/alpha/hpeldsp_alpha_asm.S
@@ -26,16 +26,6 @@
 
 #include "regdef.h"
 
-/* Some nicer register names.  */
-#define ta t10
-#define tb t11
-#define tc t12
-#define td AT
-/* Danger: these overlap with the argument list and the return value */
-#define te a5
-#define tf a4
-#define tg a3
-#define th v0
 
         .set noat
         .set noreorder
diff --git a/libavcodec/alpha/regdef.h b/libavcodec/alpha/regdef.h
index aa1959f46e..f05577a89b 100644
--- a/libavcodec/alpha/regdef.h
+++ b/libavcodec/alpha/regdef.h
@@ -63,4 +63,15 @@
 #define sp      $30     /* stack pointer */
 #define zero    $31     /* reads as zero, writes are noops */
 
+/* Some nicer register names.  */
+#define ta t10
+#define tb t11
+#define tc t12
+#define td AT
+/* Danger: these overlap with the argument list and the return value */
+#define te a5
+#define tf a4
+#define tg a3
+#define th v0
+
 #endif /* AVCODEC_ALPHA_REGDEF_H */
diff --git a/libavcodec/hpeldsp.h b/libavcodec/hpeldsp.h
index bd53edd682..8e68729d8a 100644
--- a/libavcodec/hpeldsp.h
+++ b/libavcodec/hpeldsp.h
@@ -97,12 +97,12 @@ typedef struct HpelDSPContext {
 
 void ff_hpeldsp_init(HpelDSPContext *c, int flags);
 
-void ff_hpeldsp_init_alpha(HpelDSPContext* c, int flags);
-void ff_hpeldsp_init_arm(HpelDSPContext* c, int flags);
-void ff_hpeldsp_init_bfin(HpelDSPContext* c, int flags);
-void ff_hpeldsp_init_ppc(HpelDSPContext* c, int flags);
-void ff_hpeldsp_init_sh4(HpelDSPContext* c, int flags);
-void ff_hpeldsp_init_vis(HpelDSPContext* c, int flags);
-void ff_hpeldsp_init_x86(HpelDSPContext* c, int flags);
+void ff_hpeldsp_init_alpha(HpelDSPContext *c, int flags);
+void ff_hpeldsp_init_arm(HpelDSPContext *c, int flags);
+void ff_hpeldsp_init_bfin(HpelDSPContext *c, int flags);
+void ff_hpeldsp_init_ppc(HpelDSPContext *c, int flags);
+void ff_hpeldsp_init_sh4(HpelDSPContext *c, int flags);
+void ff_hpeldsp_init_vis(HpelDSPContext *c, int flags);
+void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags);
 
 #endif /* AVCODEC_HPELDSP_H */