URL
https://opencores.org/ocsvn/amber/amber/trunk
Subversion Repositories amber
Compare Revisions
- This comparison shows the changes necessary to convert path
/
- from Rev 33 to Rev 34
- ↔ Reverse comparison
Rev 33 → Rev 34
/amber/trunk/sw/mini-libc/libc_asm.S
204,13 → 204,13
@ r1 points to source string which terminates with a 0 |
.globl strcpy |
strcpy: |
stmdb sp!, {r4-r7, lr} |
stmdb sp!, {r4-r6, lr} |
@ Use r6 to process the destination pointer. |
@ At the end of the function, r0 is returned, so need to preserve it |
mov r6, r0 |
@ only if both strings are zero-aligned use the fast 'aligned' algorithm |
orr r2, r6, r1 |
ands r2, r2, #3 |
tst r2, #3 |
bne strcpy_slow |
|
strcpy_fast: |
220,31 → 220,31
@ check for a zero byte |
@ only need to examine one of the strings because |
@ they are equal up to this point! |
ands r7, r2, #0xff |
andnes r7, r2, #0xff00 |
andnes r7, r2, #0xff0000 |
andnes r7, r2, #0xff000000 |
tst r2, #0xff |
tstne r2, #0xff00 |
tstne r2, #0xff0000 |
tstne r2, #0xff000000 |
strne r2, [r6], #4 |
subeq r1, r1, #4 |
|
andnes r7, r3, #0xff |
andnes r7, r3, #0xff00 |
andnes r7, r3, #0xff0000 |
andnes r7, r3, #0xff000000 |
tstne r3, #0xff |
tstne r3, #0xff00 |
tstne r3, #0xff0000 |
tstne r3, #0xff000000 |
strne r3, [r6], #4 |
subeq r1, r1, #4 |
|
andnes r7, r4, #0xff |
andnes r7, r4, #0xff00 |
andnes r7, r4, #0xff0000 |
andnes r7, r4, #0xff000000 |
tstne r4, #0xff |
tstne r4, #0xff00 |
tstne r4, #0xff0000 |
tstne r4, #0xff000000 |
strne r4, [r6], #4 |
subeq r1, r1, #4 |
|
andnes r7, r5, #0xff |
andnes r7, r5, #0xff00 |
andnes r7, r5, #0xff0000 |
andnes r7, r5, #0xff000000 |
tstne r5, #0xff |
tstne r5, #0xff00 |
tstne r5, #0xff0000 |
tstne r5, #0xff000000 |
strne r5, [r6], #4 |
subeq r1, r1, #4 |
|
253,27 → 253,53
|
@ the source string contains a zero character |
|
|
strcpy_aligned_slow: |
@ unroll the loop 4 times |
ldr r3, [r1], #4 |
strb r3, [r6], #1 |
ands r4, r3, #0xff |
ldmeqia sp!, {r4-r6, pc}^ |
|
lsr r3, r3, #8 |
strb r3, [r6], #1 |
ands r4, r3, #0xff |
ldmeqia sp!, {r4-r6, pc}^ |
|
lsr r3, r3, #8 |
strb r3, [r6], #1 |
ands r4, r3, #0xff |
ldmeqia sp!, {r4-r6, pc}^ |
|
lsr r3, r3, #8 |
strb r3, [r6], #1 |
ands r4, r3, #0xff |
ldmeqia sp!, {r4-r6, pc}^ |
|
b strcpy_aligned_slow |
|
|
strcpy_slow: |
@ unroll the loop 4 times |
ldrb r3, [r1], #1 |
strb r3, [r6], #1 |
cmp r3, #0 |
ldmeqia sp!, {r4-r7, pc}^ |
ldmeqia sp!, {r4-r6, pc}^ |
|
ldrb r3, [r1], #1 |
strb r3, [r6], #1 |
cmp r3, #0 |
ldmeqia sp!, {r4-r7, pc}^ |
ldmeqia sp!, {r4-r6, pc}^ |
|
ldrb r3, [r1], #1 |
strb r3, [r6], #1 |
cmp r3, #0 |
ldmeqia sp!, {r4-r7, pc}^ |
ldmeqia sp!, {r4-r6, pc}^ |
|
ldrb r3, [r1], #1 |
strb r3, [r6], #1 |
cmp r3, #0 |
ldmeqia sp!, {r4-r7, pc}^ |
ldmeqia sp!, {r4-r6, pc}^ |
|
b strcpy_slow |
|
289,7 → 315,7
|
@ only if both strings are zero-aligned use the fast 'aligned' algorithm |
orr r2, r0, r1 |
ands r2, r2, #3 |
tst r2, #3 |
bne strcmp_slow |
|
strcmp_fast: |
306,20 → 332,20
@ strings are equal - find a zero byte |
@ only need to examine one of the strings because |
@ they are equal up to this point! |
ands r8, r2, #0xff |
andnes r8, r2, #0xff00 |
andnes r8, r2, #0xff0000 |
andnes r8, r2, #0xff000000 |
tst r2, #0xff |
tstne r2, #0xff00 |
tstne r2, #0xff0000 |
tstne r2, #0xff000000 |
|
andnes r8, r3, #0xff |
andnes r8, r3, #0xff00 |
andnes r8, r3, #0xff0000 |
andnes r8, r3, #0xff000000 |
tstne r3, #0xff |
tstne r3, #0xff00 |
tstne r3, #0xff0000 |
tstne r3, #0xff000000 |
|
andnes r8, r4, #0xff |
andnes r8, r4, #0xff00 |
andnes r8, r4, #0xff0000 |
andnes r8, r4, #0xff000000 |
tstne r4, #0xff |
tstne r4, #0xff00 |
tstne r4, #0xff0000 |
tstne r4, #0xff000000 |
|
@ loop back to look at next 12 bytes |
bne strcmp_fast |
367,10 → 393,10
|
@ Skipping first 4 bytes so just check they |
@ don't contain an end of string 0 character |
2: ands r8, r2, #0xff |
andnes r8, r2, #0xff00 |
andnes r8, r2, #0xff0000 |
andnes r8, r2, #0xff000000 |
2: tst r2, #0xff |
tstne r2, #0xff00 |
tstne r2, #0xff0000 |
tstne r2, #0xff000000 |
beq bytes_zero |
|
@ start looking at 5th byte |
406,15 → 432,15
|
@ Skipping first 8 bytes so just check they |
@ don't contain an end of string 0 character |
3: ands r8, r2, #0xff |
andnes r8, r2, #0xff00 |
andnes r8, r2, #0xff0000 |
andnes r8, r2, #0xff000000 |
3: tst r2, #0xff |
tstne r2, #0xff00 |
tstne r2, #0xff0000 |
tstne r2, #0xff000000 |
|
andnes r8, r3, #0xff |
andnes r8, r3, #0xff00 |
andnes r8, r3, #0xff0000 |
andnes r8, r3, #0xff000000 |
tstne r3, #0xff |
tstne r3, #0xff00 |
tstne r3, #0xff0000 |
tstne r3, #0xff000000 |
beq bytes_zero |
|
sub r0, r0, #4 |