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[rocBLAS] adds axpy replacement reference code when using windows OpenBLAS #7184

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TorreZuk merged 2 commits into from
May 13, 2026
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[rocBLAS] adds axpy replacement reference code when using windows OpenBLAS #7184

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8744d58
adding OpenBLAS axpy replacements for WIN32
TorreZuk May 7, 2026
755ad37
clang format
TorreZuk May 7, 2026
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69 changes: 69 additions & 0 deletions projects/rocblas/clients/common/cblas_interface.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,75 @@ void ref_axpy<rocblas_half>(
// cblas_saxpy(n, alpha, x_float, incx, y_float, incy);
}

#if defined(WIN32) && !defined(BLIS_ENABLE_CBLAS)

template <typename T>
void ref_axpy(int64_t n, T alpha, T* x, int64_t incx, T* y, int64_t incy)
{
// Handle negative increments
x += incx < 0 ? incx * (1 - n) : 0;
y += incy < 0 ? incy * (1 - n) : 0;

for(int64_t i = 0; i < n; i++)
{
y[i * incy] += alpha * x[i * incx];
}
}

template void
ref_axpy<float>(int64_t n, float alpha, float* x, int64_t incx, float* y, int64_t incy);

template void
ref_axpy<double>(int64_t n, double alpha, double* x, int64_t incx, double* y, int64_t incy);

template void ref_axpy<rocblas_float_complex>(int64_t n,
rocblas_float_complex alpha,
rocblas_float_complex* x,
int64_t incx,
rocblas_float_complex* y,
int64_t incy);

template void ref_axpy<rocblas_double_complex>(int64_t n,
rocblas_double_complex alpha,
rocblas_double_complex* x,
int64_t incx,
rocblas_double_complex* y,
int64_t incy);

template <>
void ref_axpy<rocblas_bfloat16>(int64_t n,
rocblas_bfloat16 alpha,
rocblas_bfloat16* x,
int64_t incx,
rocblas_bfloat16* y,
int64_t incy)
{
// Handle negative increments
int64_t abs_incx = incx < 0 ? -incx : incx;
int64_t abs_incy = incy < 0 ? -incy : incy;

// Convert to float
host_vector<float> x_float(n * abs_incx);
host_vector<float> y_float(n * abs_incy);

for(int64_t i = 0; i < n; i++)
{
x_float[i * abs_incx] = float(x[i * abs_incx]);
y_float[i * abs_incy] = float(y[i * abs_incy]);
}

// Compute in float precision
ref_axpy<float>(n, float(alpha), x_float, incx, y_float, incy);

// Convert back to bfloat16
for(int64_t i = 0; i < n; i++)
{
y[i * abs_incy] = rocblas_bfloat16(y_float[i * abs_incy]);
}
}

#endif

template <>
void ref_asum<float>(int64_t n, const float* x, int64_t incx, float* result)
{
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2 changes: 2 additions & 0 deletions projects/rocblas/clients/include/cblas_interface.hpp
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Expand Up @@ -94,6 +94,7 @@ inline void ref_asum(int64_t n, const rocblas_double_complex* x, int64_t incx, d
template <typename T>
void ref_axpy(int64_t n, T alpha, T* x, int64_t incx, T* y, int64_t incy);

#if !(defined(WIN32) && !defined(BLIS_ENABLE_CBLAS)) // windows OpenBLAS bug override
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TorreZuk marked this conversation as resolved.
template <>
inline void ref_axpy(int64_t n, float alpha, float* x, int64_t incx, float* y, int64_t incy)
{
Expand Down Expand Up @@ -127,6 +128,7 @@ inline void ref_axpy(int64_t n,
{
cblas_zaxpy(n, &alpha, x, incx, y, incy);
}
#endif

// copy
template <typename T>
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