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Allow to be compiled with speed optimizations #418

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May 16, 2025
Merged

Allow to be compiled with speed optimizations #418

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30 changes: 15 additions & 15 deletions Adafruit_NeoPixel.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1141,7 +1141,7 @@ void Adafruit_NeoPixel::show(void) {
next = lo;
bit = 8;

asm volatile("head20:"
asm volatile("head20%=:"
"\n\t" // Clk Pseudocode (T = 0)
"st %a[port], %[hi]"
"\n\t" // 2 PORT = hi (T = 2)
Expand All @@ -1155,7 +1155,7 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 1 next = lo (T = 7)
"dec %[bit]"
"\n\t" // 1 bit-- (T = 8)
"breq nextbyte20"
"breq nextbyte20%="
"\n\t" // 1-2 if(bit == 0)
"rol %[byte]"
"\n\t" // 1 b <<= 1 (T = 10)
Expand All @@ -1167,9 +1167,9 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 2 nop nop (T = 16)
"rjmp .+0"
"\n\t" // 2 nop nop (T = 18)
"rjmp head20"
"rjmp head20%="
"\n\t" // 2 -> head20 (next bit out)
"nextbyte20:"
"nextbyte20%=:"
"\n\t" // (T = 10)
"st %a[port], %[lo]"
"\n\t" // 2 PORT = lo (T = 12)
Expand All @@ -1181,7 +1181,7 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 2 b = *ptr++ (T = 16)
"sbiw %[count], 1"
"\n\t" // 2 i-- (T = 18)
"brne head20"
"brne head20%="
"\n" // 2 if(i != 0) -> (next byte)
: [port] "+e"(port), [byte] "+r"(b), [bit] "+r"(bit),
[next] "+r"(next), [count] "+w"(i)
Expand Down Expand Up @@ -1690,7 +1690,7 @@ void Adafruit_NeoPixel::show(void) {
next = lo;
bit = 8;

asm volatile("head20:"
asm volatile("head20%=:"
"\n\t" // Clk Pseudocode (T = 0)
"st %a[port], %[hi]"
"\n\t" // 2 PORT = hi (T = 2)
Expand All @@ -1704,7 +1704,7 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 2 PORT = next (T = 7)
"mov %[next] , %[lo]"
"\n\t" // 1 next = lo (T = 8)
"breq nextbyte20"
"breq nextbyte20%="
"\n\t" // 1-2 if(bit == 0) (from dec above)
"rol %[byte]"
"\n\t" // 1 b <<= 1 (T = 10)
Expand All @@ -1718,9 +1718,9 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 1 nop (T = 16)
"rjmp .+0"
"\n\t" // 2 nop nop (T = 18)
"rjmp head20"
"rjmp head20%="
"\n\t" // 2 -> head20 (next bit out)
"nextbyte20:"
"nextbyte20%=:"
"\n\t" // (T = 10)
"ldi %[bit] , 8"
"\n\t" // 1 bit = 8 (T = 11)
Expand All @@ -1732,7 +1732,7 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 1 nop (T = 16)
"sbiw %[count], 1"
"\n\t" // 2 i-- (T = 18)
"brne head20"
"brne head20%="
"\n" // 2 if(i != 0) -> (next byte)
: [port] "+e"(port), [byte] "+r"(b), [bit] "+r"(bit),
[next] "+r"(next), [count] "+w"(i)
Expand All @@ -1753,7 +1753,7 @@ void Adafruit_NeoPixel::show(void) {
next = lo;
bit = 8;

asm volatile("head40:"
asm volatile("head40%=:"
"\n\t" // Clk Pseudocode (T = 0)
"st %a[port], %[hi]"
"\n\t" // 2 PORT = hi (T = 2)
Expand Down Expand Up @@ -1785,7 +1785,7 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 1 next = lo (T = 24)
"dec %[bit]"
"\n\t" // 1 bit-- (T = 25)
"breq nextbyte40"
"breq nextbyte40%="
"\n\t" // 1-2 if(bit == 0)
"rol %[byte]"
"\n\t" // 1 b <<= 1 (T = 27)
Expand All @@ -1801,9 +1801,9 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 2 nop nop (T = 36)
"rjmp .+0"
"\n\t" // 2 nop nop (T = 38)
"rjmp head40"
"rjmp head40%="
"\n\t" // 2 -> head40 (next bit out)
"nextbyte40:"
"nextbyte40%=:"
"\n\t" // (T = 27)
"ldi %[bit] , 8"
"\n\t" // 1 bit = 8 (T = 28)
Expand All @@ -1817,7 +1817,7 @@ void Adafruit_NeoPixel::show(void) {
"\n\t" // 2 nop nop (T = 36)
"sbiw %[count], 1"
"\n\t" // 2 i-- (T = 38)
"brne head40"
"brne head40%="
"\n" // 1-2 if(i != 0) -> (next byte)
: [port] "+e"(port), [byte] "+r"(b), [bit] "+r"(bit),
[next] "+r"(next), [count] "+w"(i)
Expand Down
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