aarch64: vp9itxfm: Restructure the idct32 store macros

This avoids concatenation, which can't be used if the whole macro
is wrapped within another macro.

This is also arguably more readable.

This is cherrypicked from libav commit
58d87e0f.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/aarch64/vp9itxfm_neon.S

@@ -935,23 +935,23 @@ function idct32_1d_8x32_pass1_neon
 .macro store_rev a, b
         // There's no rev128 instruction, but we reverse each 64 bit
         // half, and then flip them using an ext with 8 bytes offset.
-        rev64           v1.8h, v\b\().8h
-        st1             {v\a\().8h},  [x0], #16
-        rev64           v0.8h, v\a\().8h
+        rev64           v1.8h, \b
+        st1             {\a},  [x0], #16
+        rev64           v0.8h, \a
         ext             v1.16b, v1.16b, v1.16b, #8
-        st1             {v\b\().8h},  [x0], #16
+        st1             {\b},  [x0], #16
         ext             v0.16b, v0.16b, v0.16b, #8
         st1             {v1.8h},  [x0], #16
         st1             {v0.8h},  [x0], #16
 .endm
-        store_rev       16, 24
-        store_rev       17, 25
-        store_rev       18, 26
-        store_rev       19, 27
-        store_rev       20, 28
-        store_rev       21, 29
-        store_rev       22, 30
-        store_rev       23, 31
+        store_rev       v16.8h, v24.8h
+        store_rev       v17.8h, v25.8h
+        store_rev       v18.8h, v26.8h
+        store_rev       v19.8h, v27.8h
+        store_rev       v20.8h, v28.8h
+        store_rev       v21.8h, v29.8h
+        store_rev       v22.8h, v30.8h
+        store_rev       v23.8h, v31.8h
         sub             x0,  x0,  #512
 .purgem store_rev
 
@@ -977,14 +977,14 @@ function idct32_1d_8x32_pass1_neon
         // subtracted from the output.
 .macro store_rev a, b
         ld1             {v4.8h},  [x0]
-        rev64           v1.8h, v\b\().8h
-        add             v4.8h, v4.8h, v\a\().8h
-        rev64           v0.8h, v\a\().8h
+        rev64           v1.8h, \b
+        add             v4.8h, v4.8h, \a
+        rev64           v0.8h, \a
         st1             {v4.8h},  [x0], #16
         ext             v1.16b, v1.16b, v1.16b, #8
         ld1             {v5.8h},  [x0]
         ext             v0.16b, v0.16b, v0.16b, #8
-        add             v5.8h, v5.8h, v\b\().8h
+        add             v5.8h, v5.8h, \b
         st1             {v5.8h},  [x0], #16
         ld1             {v6.8h},  [x0]
         sub             v6.8h, v6.8h, v1.8h
@@ -994,14 +994,14 @@ function idct32_1d_8x32_pass1_neon
         st1             {v7.8h},  [x0], #16
 .endm
 
-        store_rev       31, 23
-        store_rev       30, 22
-        store_rev       29, 21
-        store_rev       28, 20
-        store_rev       27, 19
-        store_rev       26, 18
-        store_rev       25, 17
-        store_rev       24, 16
+        store_rev       v31.8h, v23.8h
+        store_rev       v30.8h, v22.8h
+        store_rev       v29.8h, v21.8h
+        store_rev       v28.8h, v20.8h
+        store_rev       v27.8h, v19.8h
+        store_rev       v26.8h, v18.8h
+        store_rev       v25.8h, v17.8h
+        store_rev       v24.8h, v16.8h
 .purgem store_rev
         ret
 endfunc
@@ -1047,21 +1047,21 @@ function idct32_1d_8x32_pass2_neon
 .if \neg == 0
         ld1             {v4.8h},  [x2], x9
         ld1             {v5.8h},  [x2], x9
-        add             v4.8h, v4.8h, v\a\().8h
+        add             v4.8h, v4.8h, \a
         ld1             {v6.8h},  [x2], x9
-        add             v5.8h, v5.8h, v\b\().8h
+        add             v5.8h, v5.8h, \b
         ld1             {v7.8h},  [x2], x9
-        add             v6.8h, v6.8h, v\c\().8h
-        add             v7.8h, v7.8h, v\d\().8h
+        add             v6.8h, v6.8h, \c
+        add             v7.8h, v7.8h, \d
 .else
         ld1             {v4.8h},  [x2], x7
         ld1             {v5.8h},  [x2], x7
-        sub             v4.8h, v4.8h, v\a\().8h
+        sub             v4.8h, v4.8h, \a
         ld1             {v6.8h},  [x2], x7
-        sub             v5.8h, v5.8h, v\b\().8h
+        sub             v5.8h, v5.8h, \b
         ld1             {v7.8h},  [x2], x7
-        sub             v6.8h, v6.8h, v\c\().8h
-        sub             v7.8h, v7.8h, v\d\().8h
+        sub             v6.8h, v6.8h, \c
+        sub             v7.8h, v7.8h, \d
 .endif
         ld1             {v0.8b}, [x0], x1
         ld1             {v1.8b}, [x0], x1
@@ -1085,15 +1085,15 @@ function idct32_1d_8x32_pass2_neon
         st1             {v6.8b}, [x0], x1
         st1             {v7.8b}, [x0], x1
 .endm
-        load_acc_store  31, 30, 29, 28
-        load_acc_store  27, 26, 25, 24
-        load_acc_store  23, 22, 21, 20
-        load_acc_store  19, 18, 17, 16
+        load_acc_store  v31.8h, v30.8h, v29.8h, v28.8h
+        load_acc_store  v27.8h, v26.8h, v25.8h, v24.8h
+        load_acc_store  v23.8h, v22.8h, v21.8h, v20.8h
+        load_acc_store  v19.8h, v18.8h, v17.8h, v16.8h
         sub             x2,  x2,  x9
-        load_acc_store  16, 17, 18, 19, 1
-        load_acc_store  20, 21, 22, 23, 1
-        load_acc_store  24, 25, 26, 27, 1
-        load_acc_store  28, 29, 30, 31, 1
+        load_acc_store  v16.8h, v17.8h, v18.8h, v19.8h, 1
+        load_acc_store  v20.8h, v21.8h, v22.8h, v23.8h, 1
+        load_acc_store  v24.8h, v25.8h, v26.8h, v27.8h, 1
+        load_acc_store  v28.8h, v29.8h, v30.8h, v31.8h, 1
 .purgem load_acc_store
         ret
 endfunc