stubbi/math

Unsigned integer helpers

This package supplies asm_u64_min for Linux x86-64 with the System V ABI. It returns the smaller of two unsigned 64-bit integers. The input values use rdi and rsi. The result uses rax. The function changes rax and the arithmetic flags. It does not access data memory or allocate stack storage. The caller must supply a valid call frame.

Run the example

From this directory, run:

asm run
asm test

The example prints min(12, 37) = 12. The test covers equal values, zero, the largest value, reversed inputs, and the signed boundary. These tests are not a formal proof. This package makes no performance claim.

Use the function

From a consuming project, add the exact version:

asm add stubbi/math@0.2.0 --target x86_64-linux

Include the source in your GNU assembler file:

.include "stubbi/math/0.2.0/x86_64-linux/src/min.s"

ASM adds .asm/packages to the assembler's include path. Call asm_u64_min with the interface described above. Include the file once in each linked program.