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unpack_armv6m: update comment headers and remove unneeded pushed register

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Ferdinand Bachmann
2022-09-18 18:42:44 +02:00
parent 49a611e8ba
commit 52f9778c0f
1 changed files with 11 additions and 11 deletions
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22
asm_unpackers/unpack_armv6m.S
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@@ -8,7 +8,7 @@
#define ALIGNUP(n, align) (((n) + (align) - 1) & ~((align) - 1)) #define ALIGNUP(n, align) (((n) + (align) - 1) & ~((align) - 1))
#define PROB_LEN (1 + 255 + 1 + 2*32 + 2*32) #define PROB_LEN (1 + 255 + 1 + 2*32 + 2*32)
#define DATA_OFF ALIGNUP(PROB_LEN, 4) #define FRAME_SIZE ALIGNUP(PROB_LEN, 4)
// auto upkr_unpack(uint8_t * out, uint8_t * in) -> tuple<uint8_t *, uint8_t *> // auto upkr_unpack(uint8_t * out, uint8_t * in) -> tuple<uint8_t *, uint8_t *>
.global upkr_unpack .global upkr_unpack
@@ -17,13 +17,13 @@
// r1 .. in_ptr (returned) // r1 .. in_ptr (returned)
// r2 .. state // r2 .. state
// r3 .. offset // r3 .. offset
// r4 .. prev_was_match // r4 .. prev_was_literal / decode_length ret
// r5 .. subroutine arg (preserved) // r5 .. subroutine arg (preserved)
// r6 .. subroutine ret // r6 .. decode_bit ret
// r7 .. probs ptr // r7 .. probs ptr
upkr_unpack: upkr_unpack:
push { r4, r5, r6, r7, lr } push { r4, r5, r6, r7, lr }
sub sp, sp, #DATA_OFF sub sp, sp, #FRAME_SIZE
mov r7, sp mov r7, sp
movs r2, #255 movs r2, #255
@@ -77,20 +77,20 @@ upkr_unpack:
b .Lloop b .Lloop
.Lend: .Lend:
add sp, sp, #DATA_OFF add sp, sp, #FRAME_SIZE
pop { r4, r5, r6, r7, pc } pop { r4, r5, r6, r7, pc }
.type upkr_decode_length, %function .type upkr_decode_length, %function
// r0 .. length tmp (saved) // r0 .. length tmp (saved)
// r1 .. // r1 ..
// r2 .. // r2 ..
// r3 .. bit pos (saved) // r3 ..
// r4 .. length (returned) // r4 .. length (returned)
// r5 .. content index (saved) // r5 .. context index (saved)
// r6 .. // r6 .. (saved)
// r7 .. // r7 ..
upkr_decode_length: upkr_decode_length:
push { r0, r3, r5, r6, lr } push { r0, r5, r6, lr }
movs r4, #1 movs r4, #1
movs r0, #0 movs r0, #0
@@ -109,7 +109,7 @@ upkr_decode_length:
1: 1:
orrs r4, r4, r0 orrs r4, r4, r0
pop { r0, r3, r5, r6, pc } pop { r0, r5, r6, pc }
.type upkr_decode_bit, %function .type upkr_decode_bit, %function
// r0 .. tmp / prob (saved) // r0 .. tmp / prob (saved)
@@ -117,7 +117,7 @@ upkr_decode_length:
// r2 .. state (modified) // r2 .. state (modified)
// r3 .. scratch (saved) // r3 .. scratch (saved)
// r4 .. // r4 ..
// r5 .. content index (preserved) // r5 .. context index (preserved)
// r6 .. bit (returned) // r6 .. bit (returned)
// r7 .. probs ptr (preserved) // r7 .. probs ptr (preserved)
upkr_decode_bit: upkr_decode_bit: