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only: local is king of Lua performance

This commit is contained in:
rusefillc 2024-02-12 23:15:56 -05:00
parent 61f73accfb
commit c39e98cc14
1 changed files with 13 additions and 13 deletions
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26
firmware/controllers/lua/lua_lib.h
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@ -97,26 +97,26 @@ end \
// for when you want "I want bitWidth number of bits starting at bitIndex in data array // for when you want "I want bitWidth number of bits starting at bitIndex in data array
#define GET_BIT_RANGE_LSB " \ #define GET_BIT_RANGE_LSB " \
function getBitRange(data, bitIndex, bitWidth) \n\ function getBitRange(data, bitIndex, bitWidth) \n\
byteIndex = bitIndex >> 3 \n\ local byteIndex = bitIndex >> 3 \n\
shift = bitIndex - byteIndex * 8 \n\ local shift = bitIndex - byteIndex * 8 \n\
value = data[1 + byteIndex] \n\ local value = data[1 + byteIndex] \n\
if (shift + bitWidth > 8) then \n\ if (shift + bitWidth > 8) then \n\
value = value + data[2 + byteIndex] * 256 \ value = value + data[2 + byteIndex] * 256 \
end \n\ end \n\
mask = (1 << bitWidth) - 1 \n\ local mask = (1 << bitWidth) - 1 \n\
return (value >> shift) & mask \n\ return (value >> shift) & mask \n\
end \n\ end \n\
" "
#define GET_BIT_RANGE_MSB " \ #define GET_BIT_RANGE_MSB " \
function getBitRangeMsb(data, bitIndex, bitWidth) \n\ function getBitRangeMsb(data, bitIndex, bitWidth) \n\
byteIndex = bitIndex >> 3 \n\ local byteIndex = bitIndex >> 3 \n\
shift = bitIndex - byteIndex * 8 \n\ local shift = bitIndex - byteIndex * 8 \n\
value = data[1 + byteIndex] \n\ local value = data[1 + byteIndex] \n\
if (shift + bitWidth > 8) then \n\ if (shift + bitWidth > 8) then \n\
value = value + data[0 + byteIndex] * 256 \ value = value + data[0 + byteIndex] * 256 \
end \n\ end \n\
mask = (1 << bitWidth) - 1 \n\ local mask = (1 << bitWidth) - 1 \n\
return (value >> shift) & mask \n\ return (value >> shift) & mask \n\
end \n\ end \n\
" "
@ -126,14 +126,14 @@ function setBitRange(data, totalBitIndex, bitWidth, value) \
local byteIndex = totalBitIndex >> 3 \ local byteIndex = totalBitIndex >> 3 \
local bitInByteIndex = totalBitIndex - byteIndex * 8 \ local bitInByteIndex = totalBitIndex - byteIndex * 8 \
if (bitInByteIndex + bitWidth > 8) then \ if (bitInByteIndex + bitWidth > 8) then \
bitsToHandleNow = 8 - bitInByteIndex \ local bitsToHandleNow = 8 - bitInByteIndex \
setBitRange(data, totalBitIndex + bitsToHandleNow, bitWidth - bitsToHandleNow, value >> bitsToHandleNow) \ setBitRange(data, totalBitIndex + bitsToHandleNow, bitWidth - bitsToHandleNow, value >> bitsToHandleNow) \
bitWidth = bitsToHandleNow \ bitWidth = bitsToHandleNow \
end \ end \
mask = (1 << bitWidth) - 1 \ local mask = (1 << bitWidth) - 1 \
data[1 + byteIndex] = data[1 + byteIndex] & (~(mask << bitInByteIndex)) \ data[1 + byteIndex] = data[1 + byteIndex] & (~(mask << bitInByteIndex)) \
maskedValue = value & mask \ local maskedValue = value & mask \
shiftedValue = maskedValue << bitInByteIndex \ local shiftedValue = maskedValue << bitInByteIndex \
data[1 + byteIndex] = data[1 + byteIndex] | shiftedValue \ data[1 + byteIndex] = data[1 + byteIndex] | shiftedValue \
end \n\ end \n\
" "
@ -143,7 +143,7 @@ function hyundaiSumNibbles(data, seed) \n\
local sum = seed \n\ local sum = seed \n\
for i = 1, 7, 1 \n\ for i = 1, 7, 1 \n\
do \n\ do \n\
b = data[i] \n\ local b = data[i] \n\
sum = sum + (b % 16) + math.floor(b / 16) \ sum = sum + (b % 16) + math.floor(b / 16) \
end \ end \
return (16 - sum) % 16 \ return (16 - sum) % 16 \