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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 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 *>
.global upkr_unpack
@@ -17,13 +17,13 @@
// r1 .. in_ptr (returned)
// r2 .. state
// r3 .. offset
// r4 .. prev_was_match
// r4 .. prev_was_literal / decode_length ret
// r5 .. subroutine arg (preserved)
// r6 .. subroutine ret
// r6 .. decode_bit ret
// r7 .. probs ptr
upkr_unpack:
push { r4, r5, r6, r7, lr }
sub sp, sp, #DATA_OFF
sub sp, sp, #FRAME_SIZE
mov r7, sp
movs r2, #255
@@ -77,20 +77,20 @@ upkr_unpack:
b .Lloop
.Lend:
add sp, sp, #DATA_OFF
add sp, sp, #FRAME_SIZE
pop { r4, r5, r6, r7, pc }
.type upkr_decode_length, %function
// r0 .. length tmp (saved)
// r1 ..
// r2 ..
// r3 .. bit pos (saved)
// r3 ..
// r4 .. length (returned)
// r5 .. content index (saved)
// r6 ..
// r5 .. context index (saved)
// r6 .. (saved)
// r7 ..
upkr_decode_length:
push { r0, r3, r5, r6, lr }
push { r0, r5, r6, lr }
movs r4, #1
movs r0, #0
@@ -109,7 +109,7 @@ upkr_decode_length:
1:
orrs r4, r4, r0
pop { r0, r3, r5, r6, pc }
pop { r0, r5, r6, pc }
.type upkr_decode_bit, %function
// r0 .. tmp / prob (saved)
@@ -117,7 +117,7 @@ upkr_decode_length:
// r2 .. state (modified)
// r3 .. scratch (saved)
// r4 ..
// r5 .. content index (preserved)
// r5 .. context index (preserved)
// r6 .. bit (returned)
// r7 .. probs ptr (preserved)
upkr_decode_bit: