Move optimized ffs to firmware/asm, using the new automatic-asm-picking infrastructure.

Change-Id: I5e7bdc8be7de50ef604c16078857fff1b84650dc

firmware/SOURCES

@@ -419,10 +419,6 @@ target/sh/debug-sh.c
 #elif defined(CPU_COLDFIRE)
 
 target/coldfire/crt0.S
-#ifdef HAVE_PRIORITY_SCHEDULING
-common/ffs.c
-target/coldfire/ffs-coldfire.S
-#endif
 target/coldfire/kernel-coldfire.c
 target/coldfire/system-coldfire.c
 target/coldfire/timer-coldfire.c
@@ -450,10 +446,6 @@ target/arm/mmu-arm.S
 #  endif
 # endif
 
-#ifdef HAVE_PRIORITY_SCHEDULING
-target/arm/ffs-arm.S
-#endif
-
 #if CONFIG_PLATFORM & PLATFORM_NATIVE
 target/arm/system-arm.c
 #endif
@@ -626,7 +618,6 @@ target/arm/crt0.S
 #endif /* defined(CPU_*) */
 
 #elif defined(CPU_MIPS)
-target/mips/ffs-mips.S
 target/mips/mmu-mips.c
 #if CONFIG_CPU==JZ4732
 target/mips/ingenic_jz47xx/crt0.S
@@ -634,9 +625,6 @@ target/mips/ingenic_jz47xx/crt0.S
 
 #else
 
-#ifdef HAVE_PRIORITY_SCHEDULING
-common/ffs.c
-#endif
 #if (CONFIG_PLATFORM & PLATFORM_NATIVE)
 crt0.S
 drivers/i2c.c

firmware/asm/SOURCES

@@ -1,3 +1,4 @@
+ffs.c
 memset16.c
 #if (CONFIG_PLATFORM & PLATFORM_NATIVE) || defined(HAVE_ROCKBOX_C_LIBRARY)
 memcpy.c

firmware/asm/m68k/ffs.S

@@ -62,4 +62,17 @@ find_first_set_bit:
     move.b  (%a0, %d1.l), %d0    |
     rts                          |
 
+    .section .irodata
+L_ffs_table:
+    |        0   1   2   3   4   5   6   7
+    |----------------------------------------------
+    .byte   32,  0,  1, 12,  2,  6,  0, 13  |  0- 7
+    .byte    3,  0,  7,  0,  0,  0,  0, 14  |  8-15
+    .byte   10,  4,  0,  0,  8,  0,  0, 25  | 16-23
+    .byte    0,  0,  0,  0,  0, 21, 27, 15  | 24-31
+    .byte   31, 11,  5,  0,  0,  0,  0,  0  | 32-39
+    .byte    9,  0,  0, 24,  0,  0, 20, 26  | 40-47
+    .byte   30,  0,  0,  0,  0, 23,  0, 19  | 48-55
+    .byte   29,  0, 22, 18, 28, 17, 16,  0  | 56-63
+
     .size   find_first_set_bit, .-find_first_set_bit