Modest

Asm statement

Common form

__asm(<# asm_text #>, <# outputs #>, <# inputs #>, <# clobbers #>)

Examples

// tests/asm/src/main.m

import "libc/stdio"


func sum64 (a: Int64, b: Int64) -> Int64 {
	var sum: Int64
	__asm("add %0, %1, %2", [["=r", sum]], [["r", a], ["r", b]], ["cc"])
	return sum
}


func sub64 (a: Int64, b: Int64) -> Int64 {
	var sub: Int64
	__asm("sub %0, %1, %2", [["=r", sub]], [["r", a], ["r", b]], ["cc"])
	return sub
}


func sumsub64 (a: Int64, b: Int64) -> Unit {
	var sum: Int64
	var sub: Int64

	__asm("add %0, %2, %3\nsub %1, %2, %3\n", [["=&r", sum], ["=&r", sub]], [["r", a], ["r", b]], ["cc"])

	printf("sumsub64 sum = %lld\n", sum)
	printf("sumsub64 sub = %lld\n", sub)
}


public func main () -> Int {
	printf("inline asm test\n")

	var a: Int64 = 10
	var b: Int64 = 20

	let sum = sum64(a, b)
	let sub = sub64(a, b)

	printf("sum(%lld, %lld) = %lld\n", a, b, sum)
	printf("sub(%lld, %lld) = %lld\n", a, b, sub)

	sumsub64(a, b)

	return 0
}

Result:

inline asm test
sum(10, 20) = 30
sub(10, 20) = -10
sumsub64 sum = 30
sumsub64 sub = -10

This site is open source. Improve this page.