diff --git a/src/constants.asm b/src/constants.asm
index fd30701..5fe0666 100644
--- a/src/constants.asm
+++ b/src/constants.asm
@@ -21,3 +21,23 @@ section .rodata
 	SIZE_DWORD		equ	4
 	SIZE_WORD		equ	2
 	SIZE_BYTE		equ	1
+
+	MIN_UINT64		equ	0
+	MIN_UINT32		equ	0
+	MIN_UINT16		equ	0
+	MIN_UINT8		equ	0
+
+	MAX_UINT64		equ	0xFFFFFFFFFFFFFFFF
+	MAX_UINT32		equ	0xFFFFFFFF
+	MAX_UINT16		equ	0xFFFF
+	MAX_UINT8		equ	0xFF
+
+	MIN_INT64		equ	~0x7FFFFFFFFFFFFFFF
+	MIN_INT32		equ	~0x7FFFFFFF
+	MIN_INT16		equ	~0x7FFF
+	MIN_INT8		equ	~0x7F
+
+	MAX_INT64		equ	0x7FFFFFFFFFFFFFFF
+	MAX_INT32		equ	0x7FFFFFFF
+	MAX_INT16		equ	0x7FFF
+	MAX_INT8		equ	0x7F
diff --git a/src/tests.asm b/src/tests.asm
index d681084..9df0d36 100644
--- a/src/tests.asm
+++ b/src/tests.asm
@@ -46,6 +46,7 @@ section .rodata
 	TEST_strcmp		equ	1
 	TEST_min		equ	0 ;includes minu
 	TEST_max		equ	0 ;includes maxu
+	TEST_clamp		equ	1 ;includes clampu
 
 	str1			db	"Hello, world!",EOS
 	str2			db	"Hello, World!",EOS
@@ -189,6 +190,19 @@ section .rodata
 	maxu2			db	TAB,"maxu(-15, -30):",NL,TAB,TAB,"[%d] (%x) (%b)",NL,EOS
 	maxu3			db	TAB,"maxu(-1, 0):",NL,TAB,TAB,"[%d] (%x) (%b)",NL,EOS
 	maxu4			db	TAB,"maxu(0xFFFFFFFF, -4294967295):",NL,TAB,TAB,"[%d] (%x) (%b)",NL,EOS
+
+	; clamp() / clampu()
+	msgClamp		db	NL,"clampArg1 = MIN_INT32, clampArg2 = MAX_INT32",NL,"clampuArg1 = MIN_UINT32, clampuArg2 = MAX_UINT32",NL,"TEST clamp(), clampu()",NL,EOS
+	clampArg1		equ	MIN_INT32
+	clampArg2		equ	MAX_INT32
+	clamp1			db	TAB,"clamp(MIN_INT64, clampArg1, clampArg2): %d",NL,EOS
+	clamp2			db	TAB,"clamp(MAX_INT64, clampArg1, clampArg2): %d",NL,EOS
+	clamp3			db	TAB,"clamp(MAX_UINT16, clampArg1, clampArg2): %d",NL,EOS
+	clamp4			db	TAB,"clamp(MAX_INT32+1, clampArg1, clampArg2): %d",NL,EOS
+	clampuArg1		equ	MIN_UINT32
+	clampuArg2		equ	MAX_UINT32
+	clampu1			db	TAB,"clampu(MAX_UINT64, clampArg1, clampArg2): %d",NL,EOS
+	clampu2			db	TAB,"clampu(MAX_UINT16, clampArg1, clampArg2): %d",NL,EOS
 section .data
 
 section .bss
@@ -1004,6 +1018,65 @@ _start:
 	call	printf
 %endif
 
+;---
+;--- clamp() / clampu()
+;---
+%if TEST_clamp
+	lea	rdi, [rel msgClamp]
+	call	print
+
+	; TEST 1
+	mov	rdi, MIN_INT64
+	mov	rsi, clampArg1
+	mov	rdx, clampArg2
+	call	clamp
+	mov	rsi, rax
+	lea	rdi, [rel clamp1]
+	call	printf
+	; TEST 2
+	mov	rdi, MAX_INT64
+	mov	rsi, clampArg1
+	mov	rdx, clampArg2
+	call	clamp
+	mov	rsi, rax
+	lea	rdi, [rel clamp2]
+	call	printf
+	; TEST 3
+	mov	rdi, MAX_UINT16
+	mov	rsi, clampArg1
+	mov	rdx, clampArg2
+	call	clamp
+	mov	rsi, rax
+	lea	rdi, [rel clamp3]
+	call	printf
+	; TEST 4
+	mov	rdi, MAX_INT32+1
+	mov	rsi, clampArg1
+	mov	rdx, clampArg2
+	call	clamp
+	mov	rsi, rax
+	lea	rdi, [rel clamp4]
+	call	printf
+
+	; TEST 5
+	mov	rdi, MAX_UINT64
+	mov	rsi, clampuArg1
+	mov	rdx, clampuArg2
+	call	clampu
+	mov	rsi, rax
+	lea	rdi, [rel clampu1]
+	call	printf
+
+	; TEST 6
+	mov	rdi, MAX_UINT16
+	mov	rsi, clampuArg1
+	mov	rdx, clampuArg2
+	call	clampu
+	mov	rsi, rax
+	lea	rdi, [rel clampu2]
+	call	printf
+%endif
+
 ;---
 ;--- exit()
 ;---