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.file "utils.s"
.section .iwram, "ax", %progbits
.arm
.align
@ Efficient memcpy32 function (borrowed from TONC). It uses a two step
@ approach. It tries to copy 8 u32 chunks at a time with the ldm and stm
@ instructions and then copy the remainder if there are less than 8 chunks
@ left.
@
@ r0: destination address
@ r1: source address
@ r2: number of 32bit chunks to copy
@
.global copy32
copy32:
cmp r2, #0
beq .copy32_end
and r12, r2, #7 @ r12 = r2 % 8
movs r2, r2, lsr #3 @ r2 = r2 / 8
beq .Lcopy32_residual
@ Copy 8 32B chunks at a time
push {r4-r10}
.Lcopy32_chunks:
ldmia r1!, {r3-r10}
stmia r0!, {r3-r10}
subs r2, r2, #1
bhi .Lcopy32_chunks
pop {r4-r10}
@ Copy residual 32B chunks (0-7)
.Lcopy32_residual:
subs r12, r12, #1
ldrhs r3, [r1], #4
strhs r3, [r0], #4
bhi .Lcopy32_residual
.copy32_end:
bx lr
@ Efficient memset32 function (borrowed from TONC). It uses a two step
@ approach. Uses the same stmia approach from memcpy32 but, no need for ldmia
@
@ r0: destination address
@ r1: u32 value to set
@ r2: number of 32bit chunks to set
@
.global set32
set32:
cmp r2, #0
beq .set32_end
and r12, r2, #7 @ r12 = r2 % 8
movs r2, r2, lsr #3 @ r2 = r2 / 8
beq .Lset32_residual
@ Set 8 32B chunks at a time
push {r4-r9}
mov r3, r1
mov r4, r1
mov r5, r1
mov r6, r1
mov r7, r1
mov r8, r1
mov r9, r1
.Lset32_chunks:
stmia r0!, {r1, r3-r9}
subs r2, r2, #1
bhi .Lset32_chunks
pop {r4-r9}
@ Set residual 32B chunks (0-7)
.Lset32_residual:
subs r12, r12, #1
strhs r1, [r0], #4
bhi .Lset32_residual
.set32_end:
bx lr
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