Merge pull request 'Changed docs of math functions to conform to new guidelines' (#12) from Micha_i/symphony_stdlib:math-functions-docs into main

Reviewed-on: TCShenanigans/symphony_stdlib#12
This commit is contained in:
2026-09-02 11:46:14 +02:00
+29 -8
View File
@@ -1,8 +1,15 @@
; Multiplies r1 and r2, returning the lower part of the result
; Arguments:
; r1 - The first value
; r2 - The second value
; Result:
; r1 - The lower 32 bits of the result
; Clobbers: r2, r3, r4, r5
pub mul_low: pub mul_low:
mov r3, 0 ; result mov r3, 0 ; result
mov r4, 31 ; loop counter mov r4, 31 ; loop counter
mull_loop: mul_low_loop:
asr r5, r2, 31 asr r5, r2, 31
and r5, r5, r1 and r5, r5, r1
lsl r5, r5, r4 lsl r5, r5, r4
@@ -10,14 +17,18 @@ pub mul_low:
lsl r2, r2, 1 lsl r2, r2, 1
sub r4, r4, 1 sub r4, r4, 1
cmp r4, 0 cmp r4, 0
jge mull_loop jge mul_low_loop
mov r1, r3 mov r1, r3
jmp r13 jmp r13
; Calculates the absolute value of the value provided in the r1 register ; Calculates the absolute value of the value provided in the r1 register
; Based on Stanford's BitHacks ; Arguments:
; Clobbers r2 ; r1 - The value for which we want the absolute value
; Result:
; r1 - The calculated absolute value
; Clobbers: r2
; Info: Based on Stanford's BitHacks
pub abs: ; SHOULD BE INLINED pub abs: ; SHOULD BE INLINED
; mask = v >> 31 ; mask = v >> 31
asr r2, r1, 31 asr r2, r1, 31
@@ -28,8 +39,13 @@ pub abs: ; SHOULD BE INLINED
jmp r13 jmp r13
; Calculates the minimum value of the two values provided in the r1 and r2 registers ; Calculates the minimum value of the two values provided in the r1 and r2 registers
; Based on Stanford's BitHacks ; Arguments:
; Clobbers flags ; r1 - The first value
; r2 - The second value
; Result:
; r1 - The smaller value
; Clobbers: Nothing
; Info: Based on Stanford's BitHacks
pub min: ; SHOULD BE INLINED pub min: ; SHOULD BE INLINED
; x < y ; x < y
cmp r1, r2 cmp r1, r2
@@ -45,8 +61,13 @@ pub min: ; SHOULD BE INLINED
jmp r13 jmp r13
; Calculates the maximum value of the two values provided in the r1 and r2 registers ; Calculates the maximum value of the two values provided in the r1 and r2 registers
; Based on Stanford's BitHacks ; Arguments:
; Clobbers r2 and flags ; r1 - The first value
; r2 - The second value
; Result:
; r1 - The smaller value
; Clobbers: r2
; Info: Based on Stanford's BitHacks
pub max: ; SHOULD BE INLINED pub max: ; SHOULD BE INLINED
; x < y ; x < y
cmp r1, r2 cmp r1, r2