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some more optimizations -> 176 bytes

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This commit is contained in:
Dennis Ranke
2022-09-18 17:17:37 +02:00
parent 2f820316e3
commit 49a611e8ba
1 changed files with 9 additions and 12 deletions
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21
asm_unpackers/unpack_armv6m.S
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@@ -68,8 +68,7 @@ upkr_unpack:
.Ldata_loop: .Ldata_loop:
bl upkr_decode_bit bl upkr_decode_bit
lsls r5, r5, #1 adcs r5, r5, r5
adds r5, r5, r6
lsrs r4, r5, #8 lsrs r4, r5, #8
beq .Ldata_loop beq .Ldata_loop
@@ -93,7 +92,7 @@ upkr_unpack:
upkr_decode_length: upkr_decode_length:
push { r0, r3, r5, r6, lr } push { r0, r3, r5, r6, lr }
movs r3, #0 movs r4, #1
movs r0, #0 movs r0, #0
.Lbit_loop: .Lbit_loop:
adds r5, r5, #1 adds r5, r5, #1
@@ -102,13 +101,12 @@ upkr_decode_length:
adds r5, r5, #1 adds r5, r5, #1
bl upkr_decode_bit bl upkr_decode_bit
lsls r6, r6, r3 beq 2f
adds r3, r3, #1 orrs r0, r0, r4
orrs r0, r0, r6 2:
lsls r4, r4, #1
b .Lbit_loop b .Lbit_loop
1: 1:
movs r4, #1
lsls r4, r4, r3
orrs r4, r4, r0 orrs r4, r4, r0
pop { r0, r3, r5, r6, pc } pop { r0, r3, r5, r6, pc }
@@ -141,8 +139,7 @@ upkr_decode_bit:
uxtb r2, r2 uxtb r2, r2
subs r6, r2, r0 subs r6, r2, r0
lsrs r6, r6, #31 blt 1f
bne 1f
subs r2, r2, r0 subs r2, r2, r0
rsbs r0, r0, #0 rsbs r0, r0, #0
@@ -159,12 +156,12 @@ upkr_decode_bit:
adds r0, r0, r3 adds r0, r0, r3
cmp r6, #0 cmp r6, #0
bne 1f blt 1f
rsbs r0, r0, #0 rsbs r0, r0, #0
1: 1:
strb r0, [r7, r5] strb r0, [r7, r5]
cmp r6, #0 lsrs r6, r6, #31
pop { r0, r3, pc } pop { r0, r3, pc }