diff --git a/src/crt/ineg.src b/src/crt/ineg.src
index 3e4b4e2b9..227f77985 100644
--- a/src/crt/ineg.src
+++ b/src/crt/ineg.src
@@ -10,23 +10,19 @@ __ineg := 000160h
 else
 
 __ineg:
-if 0
-	push	de
-end if
+; UHL = -UHL
+;   CC: 10*r(PC)+3*r(SPL)+1
+;   CC: 9 bytes | 10F + 3R + 1
 	add	hl, de	; uhl=UHL+UDE
 	ex	de, hl	; ude=UHL+UDE, uhl=UDE
 	or	a, a
 	sbc	hl, de	; uhl=UDE-(UHL+UDE)
 			;    =UDE-UHL-UDE
 			;    =-UHL
-if 0
-	pop	de
-else
 	ex	de, hl	; ude=-UHL, uhl=UHL+UDE
 	add	hl, de	; uhl=UHL+UDE+-UHL
 			;    =UDE
 	ex	de, hl	; ude=UDE, uhl=-UHL
-end if
 	ret
 
 end if
diff --git a/src/crt/ineg_fast.src b/src/crt/ineg_fast.src
index 0527ff957..213c16368 100644
--- a/src/crt/ineg_fast.src
+++ b/src/crt/ineg_fast.src
@@ -3,6 +3,9 @@
 	section	.text
 	public	__ineg_fast
 __ineg_fast:
+; UHL = -UHL
+;   CC: 7*r(PC)+3*r(SPL)+1
+;   CC: 6 bytes | 7F + 3R + 1
 	add	hl, de	; uhl=UHL+UDE
 	ex	de, hl	; ude=UHL+UDE, uhl=UDE
 	or	a, a
diff --git a/src/crt/inot.src b/src/crt/inot.src
index 864ce30bc..bba21948d 100644
--- a/src/crt/inot.src
+++ b/src/crt/inot.src
@@ -10,9 +10,9 @@ __inot := 000164h
 else
 
 __inot:
-if 0
-	push	de
-end if
+; UHL = ~UHL
+;   CC: 11*r(PC)+3*r(SPL)+1
+;   CC: 10 bytes | 11F + 3R + 1
 	add	hl, de	; uhl=UHL+UDE
 	ex	de, hl	; ude=UHL+UDE, uhl=UDE
 	scf
@@ -20,9 +20,6 @@ end if
 			;    =UDE-UHL-UDE-1
 			;    =-UHL-1
 			;    =~UHL
-if 0
-	pop	de
-else
 	ex	de, hl	; ude=~UHL, uhl=UHL+UDE
 	add	hl, de	; uhl=UHL+UDE+~UHL
 			;    =UHL+UDE+(-UHL-1)
@@ -30,7 +27,6 @@ else
 			;    =UDE-1
 	inc	hl	; uhl=UDE
 	ex	de, hl	; ude=UDE, uhl=~UHL
-end if
 	ret
 
 end if
diff --git a/src/crt/inot_fast.src b/src/crt/inot_fast.src
index 3c32bf605..de2458c33 100644
--- a/src/crt/inot_fast.src
+++ b/src/crt/inot_fast.src
@@ -3,6 +3,9 @@
 	section	.text
 	public	__inot_fast
 __inot_fast:
+; UHL = ~UHL
+;   CC: 7*r(PC)+3*r(SPL)+1
+;   CC: 6 bytes | 7F + 3R + 1
 	add	hl, de	; uhl=UHL+UDE
 	ex	de, hl	; ude=UHL+UDE, uhl=UDE
 	scf
diff --git a/src/crt/i48abs.src b/src/libc/i48abs.src
similarity index 100%
rename from src/crt/i48abs.src
rename to src/libc/i48abs.src
diff --git a/src/crt/i48div.src b/src/libc/i48div.src
similarity index 100%
rename from src/crt/i48div.src
rename to src/libc/i48div.src
diff --git a/src/crt/labs.src b/src/libc/labs.src
similarity index 100%
rename from src/crt/labs.src
rename to src/libc/labs.src
diff --git a/src/crt/ldiv.src b/src/libc/ldiv.src
similarity index 100%
rename from src/crt/ldiv.src
rename to src/libc/ldiv.src
diff --git a/src/crt/llabs.src b/src/libc/llabs.src
similarity index 100%
rename from src/crt/llabs.src
rename to src/libc/llabs.src
diff --git a/src/crt/lldiv.src b/src/libc/lldiv.src
similarity index 100%
rename from src/crt/lldiv.src
rename to src/libc/lldiv.src