Adds clamp[u]()

src/core.asm

@@ -10,6 +10,8 @@ section .text
 	global	minu
 	global	max
 	global	maxu
+	global	clamp
+	global	clampu
 
 ;----- exit(exit_code) -----;
 ; Exits the program with given exit code
@@ -139,3 +141,39 @@ maxu:
 	cmp	rdi, rsi
 	cmova	rax, rdi
 	ret
+
+;----- clamp(input, min, max) -----;
+; Force input (signed integer) to be atleast min and maximum max
+; Return value: input if in range of min,max. Otherwise min if below min or max if below max
+; Used registers:
+;	rax*	(ret) input, min or max
+;	rdi	(arg) input
+;	rsi	(arg) min
+;	rdx	(arg) max
+clamp:
+	mov	rax, rdi
+	cmp	rax, rsi
+	cmovl	rax, rsi
+	jl	.quit
+	cmp	rax, rdx
+	cmovg	rax, rdx
+	.quit:
+	ret
+
+;----- clampu(input, min, max) -----;
+; Force input (unsigned integer) to be atleast min and maximum max
+; Return value: input if in range of min,max. Otherwise min if below min or max if below max
+; Used registers:
+;	rax*	(ret) input, min or max
+;	rdi	(arg) input
+;	rsi	(arg) min
+;	rdx	(arg) max
+clampu:
+	mov	rax, rdi
+	cmp	rax, rsi
+	cmovb	rax, rsi
+	jb	.quit
+	cmp	rax, rdx
+	cmova	rax, rdx
+	.quit:
+	ret