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Factor out more shared math operations between RGBASM and RGBLINK

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This commit is contained in:
Rangi42
2025-08-02 19:35:26 -04:00
parent fe8baaec50
commit 2eeb333be0
4 changed files with 47 additions and 30 deletions
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23
src/opmath.cpp
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@@ -6,6 +6,8 @@
#include <stdint.h>
#include "helpers.hpp" // clz, ctz
int32_t op_divide(int32_t dividend, int32_t divisor) {
// Adjust division to floor toward negative infinity,
// not truncate toward zero
@@ -96,3 +98,24 @@ int32_t op_shift_right_unsigned(int32_t value, int32_t amount) {
return static_cast<uint32_t>(value) >> amount;
}
int32_t op_neg(int32_t value) {
// Avoid negating signed INT_MIN
return static_cast<int32_t>(-static_cast<uint32_t>(value));
}
int32_t op_high(int32_t value) {
return static_cast<int32_t>(static_cast<uint32_t>(value) >> 8 & 0xFF);
}
int32_t op_low(int32_t value) {
return value & 0xFF;
}
int32_t op_bitwidth(int32_t value) {
return value != 0 ? 32 - clz(static_cast<uint32_t>(value)) : 0;
}
int32_t op_tzcount(int32_t value) {
return value != 0 ? ctz(static_cast<uint32_t>(value)) : 32;
}