use crate::util::*;
use blas_sys;
use derive_builder::Builder;
use libc::{c_char, c_int};
use ndarray::prelude::*;
pub trait GEMMFunc<F>
where
F: BLASFloat,
{
unsafe fn gemm(
transa: *const c_char,
transb: *const c_char,
m: *const c_int,
n: *const c_int,
k: *const c_int,
alpha: *const F,
a: *const F,
lda: *const c_int,
b: *const F,
ldb: *const c_int,
beta: *const F,
c: *mut F,
ldc: *const c_int,
);
}
macro_rules! impl_func {
($type: ty, $func: ident) => {
impl GEMMFunc<$type> for BLASFunc
where
$type: BLASFloat,
{
unsafe fn gemm(
transa: *const c_char,
transb: *const c_char,
m: *const c_int,
n: *const c_int,
k: *const c_int,
alpha: *const $type,
a: *const $type,
lda: *const c_int,
b: *const $type,
ldb: *const c_int,
beta: *const $type,
c: *mut $type,
ldc: *const c_int,
) {
type FFIFloat = <$type as BLASFloat>::FFIFloat;
blas_sys::$func(
transa,
transb,
m,
n,
k,
alpha as *const FFIFloat,
a as *const FFIFloat,
lda,
b as *const FFIFloat,
ldb,
beta as *const FFIFloat,
c as *mut FFIFloat,
ldc,
);
}
}
};
}
impl_func!(f32, sgemm_);
impl_func!(f64, dgemm_);
impl_func!(c32, cgemm_);
impl_func!(c64, zgemm_);
pub struct GEMM_Driver<'a, 'b, 'c, F>
where
F: BLASFloat,
{
transa: c_char,
transb: c_char,
m: c_int,
n: c_int,
k: c_int,
alpha: F,
a: ArrayView2<'a, F>,
lda: c_int,
b: ArrayView2<'b, F>,
ldb: c_int,
beta: F,
c: ArrayOut2<'c, F>,
ldc: c_int,
}
impl<'a, 'b, 'c, F> BLASDriver<'c, F, Ix2> for GEMM_Driver<'a, 'b, 'c, F>
where
F: BLASFloat,
BLASFunc: GEMMFunc<F>,
{
fn run_blas(self) -> Result<ArrayOut2<'c, F>, AnyError> {
let transa = self.transa;
let transb = self.transb;
let m = self.m;
let n = self.n;
let k = self.k;
let alpha = self.alpha;
let a_ptr = self.a.as_ptr();
let lda = self.lda;
let b_ptr = self.b.as_ptr();
let ldb = self.ldb;
let beta = self.beta;
let mut c = self.c;
let c_ptr = match &mut c {
ArrayOut::ViewMut(c) => c.as_mut_ptr(),
ArrayOut::Owned(c) => c.as_mut_ptr(),
ArrayOut::ToBeCloned(_, c) => c.as_mut_ptr(),
};
let ldc = self.ldc;
if m == 0 || n == 0 {
return Ok(c.clone_to_view_mut());
} else if k == 0 {
if beta == F::zero() {
c.view_mut().fill(F::zero());
} else if beta != F::one() {
c.view_mut().mapv_inplace(|v| v * beta);
}
return Ok(c.clone_to_view_mut());
}
unsafe {
BLASFunc::gemm(
&transa, &transb, &m, &n, &k, &alpha, a_ptr, &lda, b_ptr, &ldb, &beta, c_ptr, &ldc,
);
}
return Ok(c.clone_to_view_mut());
}
}
#[derive(Builder)]
#[builder(pattern = "owned")]
pub struct GEMM_<'a, 'b, 'c, F>
where
F: BLASFloat,
{
pub a: ArrayView2<'a, F>,
pub b: ArrayView2<'b, F>,
#[builder(setter(into, strip_option), default = "None")]
pub c: Option<ArrayViewMut2<'c, F>>,
#[builder(setter(into), default = "F::one()")]
pub alpha: F,
#[builder(setter(into), default = "F::zero()")]
pub beta: F,
#[builder(setter(into), default = "BLASNoTrans")]
pub transa: BLASTranspose,
#[builder(setter(into), default = "BLASNoTrans")]
pub transb: BLASTranspose,
}
impl<'a, 'b, 'c, F> BLASBuilder_<'c, F, Ix2> for GEMM_<'a, 'b, 'c, F>
where
F: BLASFloat,
BLASFunc: GEMMFunc<F>,
{
fn driver(self) -> Result<GEMM_Driver<'a, 'b, 'c, F>, AnyError> {
let a = self.a;
let b = self.b;
let c = self.c;
let transa = self.transa;
let transb = self.transb;
let alpha = self.alpha;
let beta = self.beta;
let layout_a = get_layout_array2(&a);
let layout_b = get_layout_array2(&b);
assert!(layout_a.is_fpref() && layout_b.is_fpref());
let (m, k) = match transa {
BLASNoTrans => (a.len_of(Axis(0)), a.len_of(Axis(1))),
BLASTrans | BLASConjTrans => (a.len_of(Axis(1)), a.len_of(Axis(0))),
_ => blas_invalid!(transa)?,
};
let n = match transb {
BLASNoTrans => b.len_of(Axis(1)),
BLASTrans | BLASConjTrans => b.len_of(Axis(0)),
_ => blas_invalid!(transb)?,
};
let lda = a.stride_of(Axis(1));
let ldb = b.stride_of(Axis(1));
match transb {
BLASNoTrans => blas_assert_eq!(b.len_of(Axis(0)), k, "Incompatible dimensions")?,
BLASTrans | BLASConjTrans => blas_assert_eq!(b.len_of(Axis(1)), k, "Incompatible dimensions")?,
_ => blas_invalid!(transb)?,
}
let c = match c {
Some(c) => {
blas_assert_eq!(c.dim(), (m, n), "Incompatible dimensions")?;
if get_layout_array2(&c.view()).is_fpref() {
ArrayOut2::ViewMut(c)
} else {
let c_buffer = c.t().as_standard_layout().into_owned().reversed_axes();
ArrayOut2::ToBeCloned(c, c_buffer)
}
},
None => ArrayOut2::Owned(Array2::zeros((m, n).f())),
};
let ldc = c.view().stride_of(Axis(1));
let driver = GEMM_Driver {
transa: transa.into(),
transb: transb.into(),
m: m.try_into()?,
n: n.try_into()?,
k: k.try_into()?,
alpha,
a,
lda: lda.try_into()?,
b,
ldb: ldb.try_into()?,
beta,
c,
ldc: ldc.try_into()?,
};
return Ok(driver);
}
}
pub type GEMM<'a, 'b, 'c, F> = GEMM_Builder<'a, 'b, 'c, F>;
pub type SGEMM<'a, 'b, 'c> = GEMM<'a, 'b, 'c, f32>;
pub type DGEMM<'a, 'b, 'c> = GEMM<'a, 'b, 'c, f64>;
pub type CGEMM<'a, 'b, 'c> = GEMM<'a, 'b, 'c, c32>;
pub type ZGEMM<'a, 'b, 'c> = GEMM<'a, 'b, 'c, c64>;
impl<'a, 'b, 'c, F> BLASBuilder<'c, F, Ix2> for GEMM_Builder<'a, 'b, 'c, F>
where
F: BLASFloat,
BLASFunc: GEMMFunc<F>,
{
fn run(self) -> Result<ArrayOut2<'c, F>, AnyError> {
let obj = self.build()?;
let layout_a = get_layout_array2(&obj.a);
let layout_b = get_layout_array2(&obj.b);
if layout_a.is_fpref() && layout_b.is_fpref() {
return obj.driver()?.run_blas();
} else {
let a_cow = obj.a.as_standard_layout();
let b_cow = obj.b.as_standard_layout();
let obj = GEMM_ {
a: b_cow.t(),
b: a_cow.t(),
c: obj.c.map(|c| c.reversed_axes()),
alpha: obj.alpha,
beta: obj.beta,
transa: obj.transb,
transb: obj.transa,
};
let c = obj.driver()?.run_blas()?.reversed_axes();
return Ok(c);
}
}
}