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/// Provides generic access to f32 and f64 BLAS functions
#[cfg(feature = "blas")]
#[cfg(feature = "cpu")]
use super::cpu::{
api::{cblas_dgemm, cblas_sgemm},
Order, Transpose,
};
#[cfg(feature = "cuda")]
use super::cuda::api::{
cublas::{cublasDgemm_v2, cublasOperation_t, cublasSgemm_v2, CublasHandle},
CUdeviceptr,
};
/// Provides generic access to f32 and f64 BLAS functions
pub trait GenericBlas
where
Self: Sized,
{
/// Performs a f32 or f64 matrix multiplication
#[cfg(feature = "blas")]
#[cfg(feature = "cpu")]
#[allow(clippy::too_many_arguments)]
fn blas_gemm(
order: Order,
trans_a: Transpose,
trans_b: Transpose,
m: usize,
n: usize,
k: usize,
a: &[Self],
lda: usize,
b: &[Self],
ldb: usize,
c: &mut [Self],
ldc: usize,
);
/// A shortened wrapper around [`GenericBlas::blas_gemm`] with the correct parameters for a matrix multiplication
#[cfg(feature = "blas")]
#[cfg(feature = "cpu")]
#[inline]
fn gemm(m: usize, n: usize, k: usize, a: &[Self], b: &[Self], c: &mut [Self]) {
Self::blas_gemm(
Order::RowMajor,
Transpose::NoTrans,
Transpose::NoTrans,
m,
n,
k,
a,
k,
b,
n,
c,
n,
)
}
/// A shortened wrapper around [`GenericBlas::blas_gemm`] with the correct parameters for a matrix multiplication
/// It transposes the rhs (b) matrix.
#[cfg(feature = "blas")]
#[cfg(feature = "cpu")]
#[inline]
#[allow(non_snake_case)]
fn gemmT(m: usize, n: usize, k: usize, a: &[Self], b: &[Self], c: &mut [Self]) {
Self::blas_gemm(
Order::RowMajor,
Transpose::NoTrans,
Transpose::Trans,
m,
n,
k,
a,
k,
b,
k,
c,
n,
)
}
/// A shortened wrapper around [`GenericBlas::blas_gemm`] with the correct parameters for a matrix multiplication
/// It transposes the lhs (a) matrix.
#[cfg(feature = "blas")]
#[cfg(feature = "cpu")]
#[inline]
#[allow(non_snake_case)]
fn Tgemm(m: usize, n: usize, k: usize, a: &[Self], b: &[Self], c: &mut [Self]) {
Self::blas_gemm(
Order::RowMajor,
Transpose::Trans,
Transpose::NoTrans,
m,
n,
k,
a,
m,
b,
n,
c,
n,
)
}
/// Access to cublas matrix multiplication
#[cfg(feature = "cuda")]
fn cugemm(
handle: &CublasHandle,
m: usize,
n: usize,
k: usize,
a: CUdeviceptr,
b: CUdeviceptr,
c: CUdeviceptr,
) -> crate::Result<()>;
}
impl GenericBlas for f32 {
#[cfg(feature = "blas")]
#[cfg(feature = "cpu")]
#[inline]
fn blas_gemm(
order: Order,
trans_a: Transpose,
trans_b: Transpose,
m: usize,
n: usize,
k: usize,
a: &[Self],
lda: usize,
b: &[Self],
ldb: usize,
c: &mut [Self],
ldc: usize,
) {
unsafe {
cblas_sgemm(
order,
trans_a,
trans_b,
m,
n,
k,
1.0,
a.as_ptr(),
lda,
b.as_ptr(),
ldb,
0.0,
c.as_mut_ptr(),
ldc,
)
};
}
#[cfg(feature = "cuda")]
#[inline]
fn cugemm(
handle: &CublasHandle,
m: usize,
n: usize,
k: usize,
a: CUdeviceptr,
b: CUdeviceptr,
c: CUdeviceptr,
) -> crate::Result<()> {
unsafe {
cublasSgemm_v2(
handle.0,
cublasOperation_t::CUBLAS_OP_N,
cublasOperation_t::CUBLAS_OP_N,
n as i32,
m as i32,
k as i32,
&1f32 as *const f32,
b as *const u64 as *const f32,
n as i32,
a as *const u64 as *const f32,
k as i32,
&0f32 as *const f32,
c as *mut u64 as *mut f32,
n as i32,
)
}
.to_result()?;
Ok(())
}
}
impl GenericBlas for f64 {
#[cfg(feature = "blas")]
#[cfg(feature = "cpu")]
#[inline]
fn blas_gemm(
order: Order,
trans_a: Transpose,
trans_b: Transpose,
m: usize,
n: usize,
k: usize,
a: &[Self],
lda: usize,
b: &[Self],
ldb: usize,
c: &mut [Self],
ldc: usize,
) {
unsafe {
cblas_dgemm(
order,
trans_a,
trans_b,
m,
n,
k,
1.0,
a.as_ptr(),
lda,
b.as_ptr(),
ldb,
0.0,
c.as_mut_ptr(),
ldc,
)
};
}
#[cfg(feature = "cuda")]
#[inline]
fn cugemm(
handle: &CublasHandle,
m: usize,
n: usize,
k: usize,
a: CUdeviceptr,
b: CUdeviceptr,
c: CUdeviceptr,
) -> crate::Result<()> {
unsafe {
cublasDgemm_v2(
handle.0,
cublasOperation_t::CUBLAS_OP_N,
cublasOperation_t::CUBLAS_OP_N,
n as i32,
m as i32,
k as i32,
&1f64 as *const f64,
b as *const u64 as *const f64,
n as i32,
a as *const u64 as *const f64,
k as i32,
&0f64 as *const f64,
c as *mut u64 as *mut f64,
n as i32,
)
}
.to_result()?;
Ok(())
}
}