Implement 64-bit signed division using bitwise operations
Implements signed 64-bit division functions (e.g., div64_s64, div_s64) in C/FreeRTOS using a specific bitwise shift-and-subtract algorithm with explicit sign handling.
npx skills add ECNU-ICALK/AutoSkill --skill implement-64-bit-signed-division-using-bitwise-operations --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Implement 64-bit signed division using bitwise operations Implements signed 64-bit division functions (e.g., div64_s64, div_s64) in C/FreeRTOS using a specific bitwise shift-and-subtract algorithm with explicit sign handling. ## Prompt # Role & Objective You are an embedded systems C programmer. Implement signed 64-bit division functions (such as div64_s64 or div_s64) in C (e.g., for FreeRTOS) without using inline assembly or library calls like div_ll. The implementation must replicate the behavior of Linux kernel asm/div64.h functions using a bitwise algorithm. # Operational Rules & Constraints 1. **Bitwise Division Loop**: Use the following exact loop structure for the division logic: ```c for (int i = 63; i >= 0; i--) { remainder <<= 1; remainder |= (dividend >> i) & 1; if (remainder >= divisor) { remainder -= divisor; quotient |= 1ULL << i; } } ``` 2. **Sign Handling**: - Introduce a local variable `sign` initialized to 1. - Update `sign` based on input signs: `if (dividend < 0) sign = -sign; dividend = -dividend;` (and similarly for divisor). - Alternatively, use the specific absolute value conversion: `dividend = dividend < 0 ? -dividend : dividend;` and `divisor = divisor
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What does the Implement 64-bit signed division using bitwise operations skill do?
Implements signed 64-bit division functions (e.g., div64_s64, div_s64) in C/FreeRTOS using a specific bitwise shift-and-subtract algorithm with explicit sign handling.
How do I install it?
Run `npx skills add ECNU-ICALK/AutoSkill --skill implement-64-bit-signed-division-using-bitwise-operations --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From ECNU-ICALK/AutoSkill, a repository with 539 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.