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Standardize ROM function access

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Make all ROM functions (normal and floating point) provide both a direct
call that does the operation and a module with a ptr() function to get
the function pointer.
This commit is contained in:
Derek Hageman 2022-01-29 17:43:06 -07:00
parent 354a2a5e5e
commit a6daaf9fa3
3 changed files with 175 additions and 127 deletions
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2
boards/rp-pico/examples/pico_ws2812_led.rs
View file

@ -119,7 +119,7 @@ fn main() -> ! {
// Import the `sin` function for a smooth hue animation from the
// Pico rp2040 ROM:
let sin = rp_pico::hal::rom_data::float_funcs::fsin();
let sin = rp_pico::hal::rom_data::float_funcs::fsin::ptr();
// Create a count down timer for the Ws2812 instance:
let timer = Timer::new(pac.TIMER, &mut pac.RESETS);

2
rp2040-hal/examples/rom_funcs.rs
View file

@ -138,7 +138,7 @@ fn main() -> ! {
// Some functions require a look-up in a table. First we do the lookup and
// find the function pointer in ROM (you only want to do this once per
// function).
let fmul = hal::rom_data::float_funcs::fmul();
let fmul = hal::rom_data::float_funcs::fmul::ptr();
// Then we can call the function whenever we want
let start_rom = cortex_m::peripheral::SYST::get_current();

268
rp2040-hal/src/rom_data.rs
View file

@ -47,56 +47,106 @@ unsafe fn rom_hword_as_ptr(rom_address: *const u16) -> *const u32 {
ptr as *const u32
}
macro_rules! rom_funcs {
macro_rules! declare_rom_function {
(
$(
$(#[$outer:meta])*
$c:literal $name:ident (
$( $aname:ident : $aty:ty ),*
) -> $ret:ty ;
)*
fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty
$lookup:block
) => {
$(
$(#[$outer])*
pub fn $name($( $aname:$aty ),*) -> $ret{
let func: extern "C" fn( $( $aty ),* ) -> $ret = rom_table_lookup(FUNC_TABLE, *$c);
func($( $aname ),*)
#[doc = r"Additional access for the `"]
#[doc = stringify!($name)]
#[doc = r"` ROM function."]
pub mod $name {
/// Retrieve a function pointer.
pub fn ptr() -> extern "C" fn( $($argname: $ty),* ) -> $ret {
let p: *const u32 = $lookup;
unsafe {
let func : extern "C" fn( $($argname: $ty),* ) -> $ret = core::mem::transmute(p);
func
}
)*
}
}
macro_rules! rom_funcs_unsafe {
(
$(
$(#[$outer:meta])*
$c:literal $name:ident (
$( $aname:ident : $aty:ty ),*
) -> $ret:ty ;
)*
) => {
$(
$(#[$outer])*
pub unsafe fn $name($( $aname:$aty ),*) -> $ret{
let func: extern "C" fn( $( $aty ),* ) -> $ret = rom_table_lookup(FUNC_TABLE, *$c);
func($( $aname ),*)
pub extern "C" fn $name( $($argname: $ty),* ) -> $ret {
$name::ptr()($($argname),*)
}
};
(
$(#[$outer:meta])*
unsafe fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty
$lookup:block
) => {
#[doc = r"Additional access for the `"]
#[doc = stringify!($name)]
#[doc = r"` ROM function."]
pub mod $name {
/// Retrieve a function pointer.
pub fn ptr() -> unsafe extern "C" fn( $($argname: $ty),* ) -> $ret {
let p: *const u32 = $lookup;
unsafe {
let func : unsafe extern "C" fn( $($argname: $ty),* ) -> $ret = core::mem::transmute(p);
func
}
)*
}
}
rom_funcs! {
$(#[$outer])*
pub unsafe extern "C" fn $name( $($argname: $ty),* ) -> $ret {
$name::ptr()($($argname),*)
}
};
}
macro_rules! rom_functions {
() => {};
(
$(#[$outer:meta])*
$c:literal fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty;
$($rest:tt)*
) => {
declare_rom_function! {
$(#[$outer])*
fn $name( $($argname: $ty),* ) -> $ret {
$crate::rom_data::rom_table_lookup($crate::rom_data::FUNC_TABLE, *$c)
}
}
rom_functions!($($rest)*);
};
(
$(#[$outer:meta])*
$c:literal unsafe fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty;
$($rest:tt)*
) => {
declare_rom_function! {
$(#[$outer])*
unsafe fn $name( $($argname: $ty),* ) -> $ret {
$crate::rom_data::rom_table_lookup($crate::rom_data::FUNC_TABLE, *$c)
}
}
rom_functions!($($rest)*);
};
}
rom_functions! {
/// Return a count of the number of 1 bits in value.
b"P3" popcount32(value: u32) -> u32;
b"P3" fn popcount32(value: u32) -> u32;
/// Return the bits of value in the reverse order.
b"R3" reverse32(value: u32) -> u32;
b"R3" fn reverse32(value: u32) -> u32;
/// Return the number of consecutive high order 0 bits of value. If value is zero, returns 32.
b"L3" clz32(value: u32) -> u32;
b"L3" fn clz32(value: u32) -> u32;
/// Return the number of consecutive low order 0 bits of value. If value is zero, returns 32.
b"T3" ctz32(value: u32) -> u32;
b"T3" fn ctz32(value: u32) -> u32;
/// Resets the RP2040 and uses the watchdog facility to re-start in BOOTSEL mode:
/// * gpio_activity_pin_mask is provided to enable an 'activity light' via GPIO attached LED
@ -108,68 +158,66 @@ rom_funcs! {
/// * 0 To enable both interfaces (as per cold boot).
/// * 1 To disable the USB Mass Storage Interface.
/// * 2 to Disable the USB PICOBOOT Interface.
b"UB" reset_to_usb_boot(gpio_activity_pin_mask: u32, disable_interface_mask: u32) -> ();
}
b"UB" fn reset_to_usb_boot(gpio_activity_pin_mask: u32, disable_interface_mask: u32) -> ();
rom_funcs_unsafe! {
/// Sets n bytes start at ptr to the value c and returns ptr
b"MS" memset(ptr: *mut u8, c: u8, n: u8) -> *mut u8;
b"MS" unsafe fn memset(ptr: *mut u8, c: u8, n: u8) -> *mut u8;
/// Sets n bytes start at ptr to the value c and returns ptr.
///
/// Note this is a slightly more efficient variant of _memset that may only
/// be used if ptr is word aligned.
b"M4" memset4(ptr: *mut u32, c: u8, n: u32) -> *mut u32;
b"M4" unsafe fn memset4(ptr: *mut u32, c: u8, n: u32) -> *mut u32;
/// Copies n bytes starting at src to dest and returns dest. The results are undefined if the
/// regions overlap.
b"MC" memcpy(dest: *mut u8, src: *mut u8, n: u32) -> u8;
b"MC" unsafe fn memcpy(dest: *mut u8, src: *mut u8, n: u32) -> u8;
/// Copies n bytes starting at src to dest and returns dest. The results are undefined if the
/// regions overlap.
///
/// Note this is a slightly more efficient variant of _memcpy that may only be
/// used if dest and src are word aligned.
b"C4" memcpy44(dest: *mut u32, src: *mut u32, n: u32) -> *mut u8;
b"C4" unsafe fn memcpy44(dest: *mut u32, src: *mut u32, n: u32) -> *mut u8;
/// Restore all QSPI pad controls to their default state, and connect the SSI to the QSPI pads.
b"IF" connect_internal_flash() -> ();
b"IF" unsafe fn connect_internal_flash() -> ();
/// First set up the SSI for serial-mode operations, then issue the fixed XIP exit sequence.
///
/// Note that the bootrom code uses the IO forcing logic to drive the CS pin, which must be
/// cleared before returning the SSI to XIP mode (e.g. by a call to _flash_flush_cache). This
/// function configures the SSI with a fixed SCK clock divisor of /6.
b"EX" flash_exit_xip() -> ();
b"EX" unsafe fn flash_exit_xip() -> ();
/// Erase a count bytes, starting at addr (offset from start of flash). Optionally, pass a
/// block erase command e.g. D8h block erase, and the size of the block erased by this
/// command — this function will use the larger block erase where possible, for much higher
/// erase speed. addr must be aligned to a 4096-byte sector, and count must be a multiple of
/// 4096 bytes.
b"RE" flash_range_erase(addr: u32, count: usize, block_size: u32, block_cmd: u8) -> ();
b"RE" unsafe fn flash_range_erase(addr: u32, count: usize, block_size: u32, block_cmd: u8) -> ();
/// Program data to a range of flash addresses starting at `addr` (and
/// offset from the start of flash) and `count` bytes in size. The value
/// `addr` must be aligned to a 256-byte boundary, and `count` must be a
/// multiple of 256.
b"RP" flash_range_program(addr: u32, data: *const u8, count: usize) -> ();
b"RP" unsafe fn flash_range_program(addr: u32, data: *const u8, count: usize) -> ();
/// Flush and enable the XIP cache. Also clears the IO forcing on QSPI CSn, so that the SSI can
/// drive the flashchip select as normal.
b"FC" flash_flush_cache() -> ();
b"FC" unsafe fn flash_flush_cache() -> ();
/// Configure the SSI to generate a standard 03h serial read command, with 24 address bits,
/// upon each XIP access. This is a very slow XIP configuration, but is very widely supported.
/// The debugger calls this function after performing a flash erase/programming operation, so
/// that the freshly-programmed code and data is visible to the debug host, without having to
/// know exactly what kind of flash device is connected.
b"CX" flash_enter_cmd_xip() -> ();
b"CX" unsafe fn flash_enter_cmd_xip() -> ();
/// This is the method that is entered by core 1 on reset to wait to be launched by core 0.
/// There are few cases where you should call this method (resetting core 1 is much better).
/// This method does not return and should only ever be called on core 1.
b"WV" wait_for_vector() -> !;
b"WV" unsafe fn wait_for_vector() -> !;
}
unsafe fn convert_str(s: *const u8) -> &'static str {
@ -230,18 +278,18 @@ pub mod float_funcs {
)*
) => {
$(
declare_rom_function! {
$(#[$outer])*
pub fn $name() -> extern "C" fn( $( $aname : $aty ),* ) -> $ret {
let table: *const usize = $crate::rom_data::soft_float_table() as *const usize;
fn $name( $( $aname : $aty ),* ) -> $ret {
let table: *const usize = $crate::rom_data::soft_float_table();
unsafe {
// This is the entry in the table. Our offset is given as a
// byte offset, but we want the table index (each pointer in
// the table is 4 bytes long)
let entry: *const usize = table.offset($offset / 4);
// Read the pointer from the table
let ptr: usize = core::ptr::read(entry);
// Convert the pointer we read into a function
core::mem::transmute_copy(&ptr)
core::ptr::read(entry) as *const u32
}
}
}
)*
@ -249,97 +297,97 @@ pub mod float_funcs {
}
make_functions! {
/// Returns a function that will calculate `a + b`
/// Calculates `a + b`
0x00 fadd(a: f32, b: f32) -> f32;
/// Returns a function that will calculate `a - b`
/// Calculates `a - b`
0x04 fsub(a: f32, b: f32) -> f32;
/// Returns a function that will calculate `a * b`
/// Calculates `a * b`
0x08 fmul(a: f32, b: f32) -> f32;
/// Returns a function that will calculate `a / b`
/// Calculates `a / b`
0x0c fdiv(a: f32, b: f32) -> f32;
// 0x10 and 0x14 are deprecated
/// Returns a function that will calculate `sqrt(v)` (or return -Infinity if v is negative)
/// Calculates `sqrt(v)` (or return -Infinity if v is negative)
0x18 fsqrt(v: f32) -> f32;
/// Returns a function that will convert an f32 to a signed integer,
/// Converts an f32 to a signed integer,
/// rounding towards -Infinity, and clamping the result to lie within the
/// range `-0x80000000` to `0x7FFFFFFF`
0x1c float_to_int(v: f32) -> i32;
/// Returns a function that will convert an f32 to an signed fixed point
/// Converts an f32 to an signed fixed point
/// integer representation where n specifies the position of the binary
/// point in the resulting fixed point representation, e.g.
/// `f(0.5f, 16) == 0x8000`. This method rounds towards -Infinity,
/// and clamps the resulting integer to lie within the range `0x00000000` to
/// `0xFFFFFFFF`
0x20 float_to_fix(v: f32, n: i32) -> i32;
/// Returns a function that will convert an f32 to an unsigned integer,
/// Converts an f32 to an unsigned integer,
/// rounding towards -Infinity, and clamping the result to lie within the
/// range `0x00000000` to `0xFFFFFFFF`
0x24 float_to_uint(v: f32) -> u32;
/// Returns a function that will convert an f32 to an unsigned fixed point
/// Converts an f32 to an unsigned fixed point
/// integer representation where n specifies the position of the binary
/// point in the resulting fixed point representation, e.g.
/// `f(0.5f, 16) == 0x8000`. This method rounds towards -Infinity,
/// and clamps the resulting integer to lie within the range `0x00000000` to
/// `0xFFFFFFFF`
0x28 float_to_ufix(v: f32, n: i32) -> u32;
/// Returns a function that will convert a signed integer to the nearest
/// Converts a signed integer to the nearest
/// f32 value, rounding to even on tie
0x2c int_to_float(v: i32) -> f32;
/// Returns a function that will convert a signed fixed point integer
/// Converts a signed fixed point integer
/// representation to the nearest f32 value, rounding to even on tie. `n`
/// specifies the position of the binary point in fixed point, so `f =
/// nearest(v/(2^n))`
0x30 fix_to_float(v: i32, n: i32) -> f32;
/// Returns a function that will convert an unsigned integer to the nearest
/// Converts an unsigned integer to the nearest
/// f32 value, rounding to even on tie
0x34 uint_to_float(v: u32) -> f32;
/// Returns a function that will convert an unsigned fixed point integer
/// Converts an unsigned fixed point integer
/// representation to the nearest f32 value, rounding to even on tie. `n`
/// specifies the position of the binary point in fixed point, so `f =
/// nearest(v/(2^n))`
0x38 ufix_to_float(v: u32, n: i32) -> f32;
/// Returns a function that will calculate the cosine of `angle`. The value
/// Calculates the cosine of `angle`. The value
/// of `angle` is in radians, and must be in the range `-1024` to `1024`
0x3c fcos(angle: f32) -> f32;
/// Returns a function that will calculate the sine of `angle`. The value of
/// Calculates the sine of `angle`. The value of
/// `angle` is in radians, and must be in the range `-1024` to `1024`
0x40 fsin(angle: f32) -> f32;
/// Returns a function that will calculate the tangent of `angle`. The value
/// Calculates the tangent of `angle`. The value
/// of `angle` is in radians, and must be in the range `-1024` to `1024`
0x44 ftan(angle: f32) -> f32;
// 0x48 is deprecated
/// Returns a function that will calculate the exponential value of `v`,
/// Calculates the exponential value of `v`,
/// i.e. `e ** v`
0x4c fexp(v: f32) -> f32;
/// Returns a function that will calculate the natural logarithm of `v`. If `v <= 0` return -Infinity
/// Calculates the natural logarithm of `v`. If `v <= 0` return -Infinity
0x50 fln(v: f32) -> f32;
// These are only on BootROM v2 or higher
/// Returns a function that will compare two floating point numbers, returning:
/// Compares two floating point numbers, returning:
/// • 0 if a == b
/// • -1 if a < b
/// • 1 if a > b
0x54 fcmp(a: f32, b: f32) -> i32;
/// Returns a function that will compute the arc tangent of `y/x` using the
/// Computes the arc tangent of `y/x` using the
/// signs of arguments to determine the correct quadrant
0x58 fatan2(y: f32, x: f32) -> f32;
/// Returns a function that will convert a signed 64-bit integer to the
/// Converts a signed 64-bit integer to the
/// nearest f32 value, rounding to even on tie
0x5c int64_to_float(v: i64) -> f32;
/// Returns a function that will convert a signed fixed point 64-bit integer
/// Converts a signed fixed point 64-bit integer
/// representation to the nearest f32 value, rounding to even on tie. `n`
/// specifies the position of the binary point in fixed point, so `f =
/// nearest(v/(2^n))`
0x60 fix64_to_float(v: i64, n: i32) -> f32;
/// Returns a function that will convert an unsigned 64-bit integer to the
/// Converts an unsigned 64-bit integer to the
/// nearest f32 value, rounding to even on tie
0x64 uint64_to_float(v: u64) -> f32;
/// Returns a function that will convert an unsigned fixed point 64-bit
/// Converts an unsigned fixed point 64-bit
/// integer representation to the nearest f32 value, rounding to even on
/// tie. `n` specifies the position of the binary point in fixed point, so
/// `f = nearest(v/(2^n))`
@ -348,18 +396,18 @@ pub mod float_funcs {
/// and clamping the result to lie within the range `-0x8000000000000000` to
/// `0x7FFFFFFFFFFFFFFF`
0x6c float_to_int64(v: f32) -> i64;
/// Returns a function that will convert an f32 to a signed fixed point
/// Converts an f32 to a signed fixed point
/// 64-bit integer representation where n specifies the position of the
/// binary point in the resulting fixed point representation - e.g. `f(0.5f,
/// 16) == 0x8000`. This method rounds towards -Infinity, and clamps the
/// resulting integer to lie within the range `-0x8000000000000000` to
/// `0x7FFFFFFFFFFFFFFF`
0x70 float_to_fix64(v: f32, n: i32) -> f32;
/// Returns a function that will convert an f32 to an unsigned 64-bit
/// Converts an f32 to an unsigned 64-bit
/// integer, rounding towards -Infinity, and clamping the result to lie
/// within the range `0x0000000000000000` to `0xFFFFFFFFFFFFFFFF`
0x74 float_to_uint64(v: f32) -> u64;
/// Returns a function that will convert an f32 to an unsigned fixed point
/// Converts an f32 to an unsigned fixed point
/// 64-bit integer representation where n specifies the position of the
/// binary point in the resulting fixed point representation, e.g. `f(0.5f,
/// 16) == 0x8000`. This method rounds towards -Infinity, and clamps the
@ -384,18 +432,18 @@ pub mod double_funcs {
)*
) => {
$(
declare_rom_function! {
$(#[$outer])*
pub fn $name() -> extern "C" fn( $( $aname : $aty ),* ) -> $ret {
let table: *const usize = $crate::rom_data::soft_double_table() as *const usize;
fn $name( $( $aname : $aty ),* ) -> $ret {
let table: *const usize = $crate::rom_data::soft_double_table();
unsafe {
// This is the entry in the table. Our offset is given as a
// byte offset, but we want the table index (each pointer in
// the table is 4 bytes long)
let entry: *const usize = table.offset($offset / 4);
// Read the pointer from the table
let ptr: usize = core::ptr::read(entry);
// Convert the pointer we read into a function
core::mem::transmute_copy(&ptr)
core::ptr::read(entry) as *const u32
}
}
}
)*
@ -403,97 +451,97 @@ pub mod double_funcs {
}
make_double_funcs! {
/// Returns a function that will calculate `a + b`
/// Calculates `a + b`
0x00 dadd(a: f64, b: f64) -> f64;
/// Returns a function that will calculate `a - b`
/// Calculates `a - b`
0x04 dsub(a: f64, b: f64) -> f64;
/// Returns a function that will calculate `a * b`
/// Calculates `a * b`
0x08 dmul(a: f64, b: f64) -> f64;
/// Returns a function that will calculate `a / b`
/// Calculates `a / b`
0x0c ddiv(a: f64, b: f64) -> f64;
// 0x10 and 0x14 are deprecated
/// Returns a function that will calculate `sqrt(v)` (or return -Infinity if v is negative)
/// Calculates `sqrt(v)` (or return -Infinity if v is negative)
0x18 dsqrt(v: f64) -> f64;
/// Returns a function that will convert an f64 to a signed integer,
/// Converts an f64 to a signed integer,
/// rounding towards -Infinity, and clamping the result to lie within the
/// range `-0x80000000` to `0x7FFFFFFF`
0x1c double_to_int(v: f64) -> i32;
/// Returns a function that will convert an f64 to an signed fixed point
/// Converts an f64 to an signed fixed point
/// integer representation where n specifies the position of the binary
/// point in the resulting fixed point representation, e.g.
/// `f(0.5f, 16) == 0x8000`. This method rounds towards -Infinity,
/// and clamps the resulting integer to lie within the range `0x00000000` to
/// `0xFFFFFFFF`
0x20 double_to_fix(v: f64, n: i32) -> i32;
/// Returns a function that will convert an f64 to an unsigned integer,
/// Converts an f64 to an unsigned integer,
/// rounding towards -Infinity, and clamping the result to lie within the
/// range `0x00000000` to `0xFFFFFFFF`
0x24 double_to_uint(v: f64) -> u32;
/// Returns a function that will convert an f64 to an unsigned fixed point
/// Converts an f64 to an unsigned fixed point
/// integer representation where n specifies the position of the binary
/// point in the resulting fixed point representation, e.g.
/// `f(0.5f, 16) == 0x8000`. This method rounds towards -Infinity,
/// and clamps the resulting integer to lie within the range `0x00000000` to
/// `0xFFFFFFFF`
0x28 double_to_ufix(v: f64, n: i32) -> u32;
/// Returns a function that will convert a signed integer to the nearest
/// Converts a signed integer to the nearest
/// double value, rounding to even on tie
0x2c int_to_double(v: i32) -> f64;
/// Returns a function that will convert a signed fixed point integer
/// Converts a signed fixed point integer
/// representation to the nearest double value, rounding to even on tie. `n`
/// specifies the position of the binary point in fixed point, so `f =
/// nearest(v/(2^n))`
0x30 fix_to_double(v: i32, n: i32) -> f64;
/// Returns a function that will convert an unsigned integer to the nearest
/// Converts an unsigned integer to the nearest
/// double value, rounding to even on tie
0x34 uint_to_double(v: u32) -> f64;
/// Returns a function that will convert an unsigned fixed point integer
/// Converts an unsigned fixed point integer
/// representation to the nearest double value, rounding to even on tie. `n`
/// specifies the position of the binary point in fixed point, so f =
/// nearest(v/(2^n))
0x38 ufix_to_double(v: u32, n: i32) -> f64;
/// Returns a function that will calculate the cosine of `angle`. The value
/// Calculates the cosine of `angle`. The value
/// of `angle` is in radians, and must be in the range `-1024` to `1024`
0x3c dcos(angle: f64) -> f64;
/// Returns a function that will calculate the sine of `angle`. The value of
/// Calculates the sine of `angle`. The value of
/// `angle` is in radians, and must be in the range `-1024` to `1024`
0x40 dsin(angle: f64) -> f64;
/// Returns a function that will calculate the tangent of `angle`. The value
/// Calculates the tangent of `angle`. The value
/// of `angle` is in radians, and must be in the range `-1024` to `1024`
0x44 dtan(angle: f64) -> f64;
// 0x48 is deprecated
/// Returns a function that will calculate the exponential value of `v`,
/// Calculates the exponential value of `v`,
/// i.e. `e ** v`
0x4c dexp(v: f64) -> f64;
/// Returns a function that will calculate the natural logarithm of v. If v <= 0 return -Infinity
/// Calculates the natural logarithm of v. If v <= 0 return -Infinity
0x50 dln(v: f64) -> f64;
// These are only on BootROM v2 or higher
/// Returns a function that will compare two floating point numbers, returning:
/// Compares two floating point numbers, returning:
/// • 0 if a == b
/// • -1 if a < b
/// • 1 if a > b
0x54 dcmp(a: f64, b: f64) -> i32;
/// Returns a function that will compute the arc tangent of `y/x` using the
/// Computes the arc tangent of `y/x` using the
/// signs of arguments to determine the correct quadrant
0x58 datan2(y: f64, x: f64) -> f64;
/// Returns a function that will convert a signed 64-bit integer to the
/// Converts a signed 64-bit integer to the
/// nearest double value, rounding to even on tie
0x5c int64_to_double(v: i64) -> f64;
/// Returns a function that will convert a signed fixed point 64-bit integer
/// Converts a signed fixed point 64-bit integer
/// representation to the nearest double value, rounding to even on tie. `n`
/// specifies the position of the binary point in fixed point, so `f =
/// nearest(v/(2^n))`
0x60 fix64_to_doubl(v: i64, n: i32) -> f64;
/// Returns a function that will convert an unsigned 64-bit integer to the
/// Converts an unsigned 64-bit integer to the
/// nearest double value, rounding to even on tie
0x64 uint64_to_double(v: u64) -> f64;
/// Returns a function that will convert an unsigned fixed point 64-bit
/// Converts an unsigned fixed point 64-bit
/// integer representation to the nearest double value, rounding to even on
/// tie. `n` specifies the position of the binary point in fixed point, so
/// `f = nearest(v/(2^n))`
@ -502,25 +550,25 @@ pub mod double_funcs {
/// and clamping the result to lie within the range `-0x8000000000000000` to
/// `0x7FFFFFFFFFFFFFFF`
0x6c double_to_int64(v: f64) -> i64;
/// Returns a function that will convert an f64 to a signed fixed point
/// Converts an f64 to a signed fixed point
/// 64-bit integer representation where n specifies the position of the
/// binary point in the resulting fixed point representation - e.g. `f(0.5f,
/// 16) == 0x8000`. This method rounds towards -Infinity, and clamps the
/// resulting integer to lie within the range `-0x8000000000000000` to
/// `0x7FFFFFFFFFFFFFFF`
0x70 double_to_fix64(v: f64, n: i32) -> i64;
/// Returns a function that will convert an f64 to an unsigned 64-bit
/// Converts an f64 to an unsigned 64-bit
/// integer, rounding towards -Infinity, and clamping the result to lie
/// within the range `0x0000000000000000` to `0xFFFFFFFFFFFFFFFF`
0x74 double_to_uint64(v: f64) -> u64;
/// Returns a function that will convert an f64 to an unsigned fixed point
/// Converts an f64 to an unsigned fixed point
/// 64-bit integer representation where n specifies the position of the
/// binary point in the resulting fixed point representation, e.g. `f(0.5f,
/// 16) == 0x8000`. This method rounds towards -Infinity, and clamps the
/// resulting integer to lie within the range `0x0000000000000000` to
/// `0xFFFFFFFFFFFFFFFF`
0x78 double_to_ufix64(v: f64, n: i32) -> u64;
/// Returns a function that will convert an f64 to an f32
/// Converts an f64 to an f32
0x7c double_to_float(v: f64) -> f32;
}
}