Spinel log backend #1
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kkasperczyk-no
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Jul 3, 2020
This makes the gatt metrics also available for gatt write-without-rsp-cb so it now prints the rate of each write: uart:~$ gatt write-without-response-cb 1e ff 10 10 Write #1: 16 bytes (0 bps) Write #2: 32 bytes (3445948416 bps) Write #3: 48 bytes (2596929536 bps) Write #4: 64 bytes (6400 bps) Write #5: 80 bytes (8533 bps) Write #6: 96 bytes (10666 bps) Write #7: 112 bytes (8533 bps) Write #8: 128 bytes (9955 bps) Write zephyrproject-rtos#9: 144 bytes (11377 bps) Write zephyrproject-rtos#10: 160 bytes (7680 bps) Write zephyrproject-rtos#11: 176 bytes (8533 bps) Write zephyrproject-rtos#12: 192 bytes (9386 bps) Write Complete (err 0) Write zephyrproject-rtos#13: 208 bytes (8533 bps) Write zephyrproject-rtos#14: 224 bytes (9244 bps) Write zephyrproject-rtos#15: 240 bytes (9955 bps) Write zephyrproject-rtos#16: 256 bytes (8000 bps) Signed-off-by: Luiz Augusto von Dentz <[email protected]>
kkasperczyk-no
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Nov 12, 2020
The _ldiv5() is an optimized divide-by-5 function that is smaller and
faster than the generic libgcc implementation.
Yet it can be made even smaller and faster with this replacement
implementation based on a reciprocal multiplication plus some tricks.
For example, here's the assembly from the original code on ARM:
_ldiv5:
ldr r3, [r0]
movw ip, zephyrproject-rtos#52429
ldr r1, [r0, #4]
movt ip, 52428
adds r3, r3, #2
push {r4, r5, r6, r7, lr}
mov lr, #0
adc r1, r1, lr
adds r2, lr, lr
umull r7, r6, ip, r1
lsr r6, r6, #2
adc r7, r6, r6
adds r2, r2, r2
adc r7, r7, r7
adds r2, r2, lr
adc r7, r7, r6
subs r3, r3, r2
sbc r7, r1, r7
lsr r2, r3, #3
orr r2, r2, r7, lsl zephyrproject-rtos#29
umull r2, r1, ip, r2
lsr r2, r1, #2
lsr r7, r1, zephyrproject-rtos#31
lsl r1, r2, #3
adds r4, lr, r1
adc r5, r6, r7
adds r2, r1, r1
adds r2, r2, r2
adds r2, r2, r1
subs r2, r3, r2
umull r3, r2, ip, r2
lsr r2, r2, #2
adds r4, r4, r2
adc r5, r5, #0
strd r4, [r0]
pop {r4, r5, r6, r7, pc}
And here's the resulting assembly with this commit applied:
_ldiv5:
push {r4, r5, r6, r7}
movw r4, zephyrproject-rtos#13107
ldr r6, [r0]
movt r4, 13107
ldr r1, [r0, #4]
mov r3, #0
umull r6, r7, r6, r4
add r2, r4, r4, lsl #1
umull r4, r5, r1, r4
adds r1, r6, r2
adc r2, r7, r2
adds ip, r6, r4
adc r1, r7, r5
adds r2, ip, r2
adc r2, r1, r3
adds r2, r4, r2
adc r3, r5, r3
strd r2, [r0]
pop {r4, r5, r6, r7}
bx lr
So we're down to 20 instructions from 36 initially, with only 2 umull
instructions instead of 3, and slightly smaller stack footprint.
Signed-off-by: Nicolas Pitre <[email protected]>
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