StrafesNET/fixed_wide_vectors
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implement 'fix' function that changes the fixed point

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Quaternions 2024-09-11 13:59:33 -07:00
parent a73a32f2ad
commit db5c37c2fb
3 changed files with 111 additions and 27 deletions
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124
fixed_wide/src/fixed.rs
View File

@ -380,6 +380,7 @@ impl_shift_operator!( Fixed, Shr, shr, Self );
// wide operators. The result width is the sum of the input widths, i.e. none of the multiplication // wide operators. The result width is the sum of the input widths, i.e. none of the multiplication
#[allow(unused_macros)]
macro_rules! impl_wide_operators{ macro_rules! impl_wide_operators{
($lhs:expr,$rhs:expr)=>{ ($lhs:expr,$rhs:expr)=>{
impl core::ops::Mul<Fixed<$rhs,{$rhs*32}>> for Fixed<$lhs,{$lhs*32}>{ impl core::ops::Mul<Fixed<$rhs,{$rhs*32}>> for Fixed<$lhs,{$lhs*32}>{
@ -467,21 +468,101 @@ macro_repeated!(
(1,14),(2,14), (1,14),(2,14),
(1,15) (1,15)
); );
impl<const SRC:usize,const F:usize> Fixed<SRC,F>{
macro_rules! impl_fix_rhs_lt_lhs_not_const_generic{
(
(),
($lhs:expr,$rhs:expr)
)=>{
impl Fixed<$lhs,{$lhs*32}>
{
paste::item!{
#[inline] #[inline]
pub fn resize_into<const DST:usize>(self)->Fixed<DST,F>{ pub fn [<fix_ $rhs>](self)->Fixed<$rhs,{$rhs*32}>{
Fixed::from_bits(self.bits.as_::<BInt<DST>>()) Fixed::from_bits(bnum::cast::As::as_::<BInt::<$rhs>>(self.bits).shr(($lhs-$rhs)*32))
}
}
}
}
}
macro_rules! impl_fix_lhs_lt_rhs_not_const_generic{
(
(),
($lhs:expr,$rhs:expr)
)=>{
impl Fixed<$lhs,{$lhs*32}>
{
paste::item!{
#[inline]
pub fn [<fix_ $rhs>](self)->Fixed<$rhs,{$rhs*32}>{
Fixed::from_bits(bnum::cast::As::as_::<BInt::<$rhs>>(self.bits).shl(($rhs-$lhs)*32))
}
}
}
}
}
macro_rules! impl_fix_lhs_eq_rhs_not_const_generic{
(
(),
($lhs:expr,$rhs:expr)
)=>{
impl Fixed<$lhs,{$lhs*32}>
{
paste::item!{
#[inline]
pub fn [<fix_ $rhs>](self)->Fixed<$rhs,{$rhs*32}>{
self
}
}
}
} }
} }
// I LOVE NOT BEING ABLE TO USE CONST GENERICS
macro_repeated!(
impl_fix_rhs_lt_lhs_not_const_generic,(),
(2,1),(3,1),(4,1),(5,1),(6,1),(7,1),(8,1),(9,1),(10,1),(11,1),(12,1),(13,1),(14,1),(15,1),(16,1),
(3,2),(4,2),(5,2),(6,2),(7,2),(8,2),(9,2),(10,2),(11,2),(12,2),(13,2),(14,2),(15,2),(16,2),
(4,3),(5,3),(6,3),(7,3),(8,3),(9,3),(10,3),(11,3),(12,3),(13,3),(14,3),(15,3),(16,3),
(5,4),(6,4),(7,4),(8,4),(9,4),(10,4),(11,4),(12,4),(13,4),(14,4),(15,4),(16,4),
(6,5),(7,5),(8,5),(9,5),(10,5),(11,5),(12,5),(13,5),(14,5),(15,5),(16,5),
(7,6),(8,6),(9,6),(10,6),(11,6),(12,6),(13,6),(14,6),(15,6),(16,6),
(8,7),(9,7),(10,7),(11,7),(12,7),(13,7),(14,7),(15,7),(16,7),
(9,8),(10,8),(11,8),(12,8),(13,8),(14,8),(15,8),(16,8),
(10,9),(11,9),(12,9),(13,9),(14,9),(15,9),(16,9),
(11,10),(12,10),(13,10),(14,10),(15,10),(16,10),
(12,11),(13,11),(14,11),(15,11),(16,11),
(13,12),(14,12),(15,12),(16,12),
(14,13),(15,13),(16,13),
(15,14),(16,14),
(16,15)
);
macro_repeated!(
impl_fix_lhs_lt_rhs_not_const_generic,(),
(1,2),
(1,3),(2,3),
(1,4),(2,4),(3,4),
(1,5),(2,5),(3,5),(4,5),
(1,6),(2,6),(3,6),(4,6),(5,6),
(1,7),(2,7),(3,7),(4,7),(5,7),(6,7),
(1,8),(2,8),(3,8),(4,8),(5,8),(6,8),(7,8),
(1,9),(2,9),(3,9),(4,9),(5,9),(6,9),(7,9),(8,9),
(1,10),(2,10),(3,10),(4,10),(5,10),(6,10),(7,10),(8,10),(9,10),
(1,11),(2,11),(3,11),(4,11),(5,11),(6,11),(7,11),(8,11),(9,11),(10,11),
(1,12),(2,12),(3,12),(4,12),(5,12),(6,12),(7,12),(8,12),(9,12),(10,12),(11,12),
(1,13),(2,13),(3,13),(4,13),(5,13),(6,13),(7,13),(8,13),(9,13),(10,13),(11,13),(12,13),
(1,14),(2,14),(3,14),(4,14),(5,14),(6,14),(7,14),(8,14),(9,14),(10,14),(11,14),(12,14),(13,14),
(1,15),(2,15),(3,15),(4,15),(5,15),(6,15),(7,15),(8,15),(9,15),(10,15),(11,15),(12,15),(13,15),(14,15),
(1,16),(2,16),(3,16),(4,16),(5,16),(6,16),(7,16),(8,16),(9,16),(10,16),(11,16),(12,16),(13,16),(14,16),(15,16)
);
macro_repeated!(
impl_fix_lhs_eq_rhs_not_const_generic,(),
(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9),(10,10),(11,11),(12,12),(13,13),(14,14),(15,15),(16,16)
);
macro_rules! impl_not_const_generic{ macro_rules! impl_not_const_generic{
($n:expr)=>{ ($n:expr,$_2n:expr)=>{
impl Fixed<{$n*2},{$n*2*32}>{
#[inline]
pub fn halve_precision(self)->Fixed<$n,{$n*32}>{
Fixed::from_bits(bnum::cast::As::as_(self.bits.shr($n*32)))
}
}
impl Fixed<$n,{$n*32}>{ impl Fixed<$n,{$n*32}>{
paste::item!{ paste::item!{
#[inline] #[inline]
@ -496,13 +577,12 @@ macro_rules! impl_not_const_generic{
let max_shift=((used_bits>>1)+($n*32) as i32) as u32; let max_shift=((used_bits>>1)+($n*32) as i32) as u32;
let mut result=Self::ZERO; let mut result=Self::ZERO;
//multiply by one to make the types match (hack) //resize self to match the wide mul output
//TODO: use resize method let wide_self=self.[<fix_ $_2n>]();
let wide_self:<Self as core::ops::Mul>::Output=self*Self::ONE;
//descend down the bits and check if flipping each bit would push the square over the input value //descend down the bits and check if flipping each bit would push the square over the input value
for shift in (0..=max_shift).rev(){ for shift in (0..=max_shift).rev(){
let new_result=result|Self::from_bits(BInt::from_bits(bnum::BUint::power_of_two(shift))); let new_result=result|Self::from_bits(BInt::from_bits(bnum::BUint::power_of_two(shift)));
if new_result*new_result<=wide_self{ if new_result.[<wide_mul_ $n _ $n>](new_result)<=wide_self{
result=new_result; result=new_result;
} }
} }
@ -528,11 +608,11 @@ macro_rules! impl_not_const_generic{
} }
} }
} }
impl_not_const_generic!(1); impl_not_const_generic!(1,2);
impl_not_const_generic!(2); impl_not_const_generic!(2,4);
impl_not_const_generic!(3); impl_not_const_generic!(3,6);
impl_not_const_generic!(4); impl_not_const_generic!(4,8);
impl_not_const_generic!(5); impl_not_const_generic!(5,10);
impl_not_const_generic!(6); impl_not_const_generic!(6,12);
impl_not_const_generic!(7); impl_not_const_generic!(7,14);
impl_not_const_generic!(8); impl_not_const_generic!(8,16);

5
fixed_wide/src/tests.rs
View File

@ -52,6 +52,11 @@ fn test_bint(){
assert_eq!(a*2,I32F32::from(2)); assert_eq!(a*2,I32F32::from(2));
} }
#[test]
fn test_fix(){
let a=I32F32::ONE;
assert_eq!(a.fix_8(),I256F256::ONE);
}
#[test] #[test]
fn test_sqrt(){ fn test_sqrt(){
let a=I32F32::ONE*4; let a=I32F32::ONE*4;

7
fixed_wide/src/zeroes.rs
View File

@ -12,13 +12,12 @@ macro_rules! impl_zeroes{
Ordering::Equal=>return ArrayVec::from_iter(Self::zeroes1(a0,a1).into_iter()), Ordering::Equal=>return ArrayVec::from_iter(Self::zeroes1(a0,a1).into_iter()),
Ordering::Less=>true, Ordering::Less=>true,
}; };
paste::item!{
let radicand=a1*a1-a2*a0*4; let radicand=a1*a1-a2*a0*4;
}
match radicand.cmp(&<Self as core::ops::Mul>::Output::ZERO){ match radicand.cmp(&<Self as core::ops::Mul>::Output::ZERO){
Ordering::Greater=>{ Ordering::Greater=>{
//TODO: use resize method paste::item!{
let planar_radicand:Self=radicand.sqrt().halve_precision(); let planar_radicand=radicand.sqrt().[<fix_ $n>]();
}
//sort roots ascending and avoid taking the difference of large numbers //sort roots ascending and avoid taking the difference of large numbers
let zeroes=match (a2pos,Self::ZERO<a1){ let zeroes=match (a2pos,Self::ZERO<a1){
(true, true )=>[(-a1-planar_radicand)/(a2*2),(a0*2)/(-a1-planar_radicand)], (true, true )=>[(-a1-planar_radicand)/(a2*2),(a0*2)/(-a1-planar_radicand)],