AOCL 5.2 GA Release

AOCL-BLAS 5.2 Release Notes

Overview

This release includes significant performance improvements, new features, and critical bug fixes for the AOCL - BLAS linear algebra library, with optimizations specifically targeting AMD Zen4 and Zen5 architectures.

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Performance Improvements

GEMM Improvements

• Tuned ZGEMM thresholds for Zen4 and Zen5 architectures
• Optimized AVX512 ZGEMM kernel and edge-case handling
• Improved ZGEMM packing kernel for M-dimension edge cases
• Developed Optimal thread selection logic for ZGEMM on Zen5

GEMV Enhancements

• Added DGEMV no-transpose multithreaded implementations
• Exported AVX512 DGEMV kernels
• DGEMV bug fixes and code cleanup
• Added ability to handle non-unit incx in GEMV transpose kernel
• Improved numerical precision in ZGEMV API

DCOPY Optimization

• Tuned DCOPY aocl_dynamic logic for Zen4/Zen5 architectures

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New Features

• Additional build options to disable optimized code paths for smaller matrices in GEMM and TRSM

  • Useful for testing and benchmarking
  • Reduces numerical rounding differences when repeating calculations with different core counts

• Complete set of GEMMTR APIs implemented

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Bug Fixes

Critical Fixes

• Fixed probable integer overflow in TPSV
• Fixed ZTRSM accuracy for conjugate transpose
• Fixed DTRSM small threshold for extremely skinny sizes on Zen5

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Acknowledgments

This release is the result of contributions from the AOCL team at AMD and the broader BLIS community.

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Release Date: January 2026
Version: 5.2 GA

AOCL-BLAS 5.1 GA

Performance Optimizations

• DGEMM, DTRSM, DGEMV, ZGEMM, DTRSV, DCOPYV on Zen4/5
• DSCALV, DDOTV on Zen3
• Benchmark support for ASUMV
• Minor Bug Fixes.

Aocl-gemm Add-on Module updates

• AOCL_ENABLE_INSTRUCTIONS support
• batch_gemm support for all data types
• New Output Datatype for Integer APIs
• BF16 Support on AVX2 Platforms
• WOQ with/without Group Quantization
• Threading Framework Optimizations
• Reference Kernels for all Reorder APIs
• Performance Optimizations for all APIs
• Additional APIs and Post-Ops support in addition to the improved performance for the existing APIs

AOCL-BLAS 5.0

AOCL-BLAS 5.0 Release Highlights

• Added zen5 support
• Turin specific tuning for the APIs: D/ZGEMM, DTRSM and DNRM2
• AVX512 made improvements for the APIs: ZGEMV, D/ZAXPYF, D/ZDOTXF, ZDOTV, C/ZSCALV, DNRM2, S/D/ZCOPY, S/D/C/ZAXPBYV, DTRSV, DGEMMT, D/ZTRSM, and D/ZGEMM
• Improvements to the AOCL_ENABLE_INSTRUCTIONS functionality
• Additional APIs and Post-Ops support in addition to the improved performance for the existing APIs in aocl_gemm add-on

AOCL-BLAS 4.2

AOCL-BLAS 4.2 Release Highlights

• Added uint8 output and zero-point support in int8 API’s in aocl_gemm addon (Low Precision GEMM / LPGEMM)
• Improved performance for all downscaled versions of all API’s in aocl_gemm addon (Low Precision GEMM / LPGEMM)
• Multithread performance improved across API’s in aocl_gemm addon (Low Precision GEMM / LPGEMM)
• Introduced AOCL_ENABLE_INSTRUCTIONS environment variable as an alternative to BLIS_ARCH_TYPE, but with slightly different semantics.
• Improved functionality of XERBLA error handling routine in AOCL-BLAS.
• Performance optimizations for the following APIs:
  - DGEMM for tiny sizes
  - S/ZGEMM, D/ZTRSM, ZAXPBYV, Z/ZDSCALV, S/D/ZGEMV, and D/DZNRM2
• Following BLAS extension APIs have been added only for AMD “Zen” code paths:
  - sgemm_pack_get_size(), sgemm_pack(), and sgemm_compute()
  - dgemm_pack_get_size(), dgemm_pack(), and dgemm_compute()

AOCL-BLAS 4.1

AOCL-BLAS 4.1 Release Highlights

• Additional APIs and Post-Ops support in addition to the improved performance for the existing APIs in aocl_gemm add-on
• Dynamic dispatch and amdzen configuration support added to aocl_gemm add-on
• Dynamic dispatch feature enhancements.
• AVX 512-based optimizations for AMD “Zen4” platform:
  - SGEMM, DGEMM, and ZGEMM
  - DTRSM, D/ZAXPY, ZGEMV, DDOTV, and D/ZSCALV
• Improved support for OpenMP nested parallelism.

AOCL-BLIS 4.0

Highlights of AOCL-BLIS 4.0

• The following LPGEMM (Low Precision GEMM) variants are added along with post-ops support:
  • aocl_gemm_u8s8s32os32 and aocl_gemm_u8s8s32os8 routines are added and optimized using AVX-512-VNNI
  • aocl_gemm_u8s8s16os16 and aocl_gemm_u8s8s16os8 routines are added and optimized using AVX2
  • aocl_gemm_bf16bf16f32of32 and aocl_gemm_bf16bf16f32obf16 routines are added and optimized using AVX-512
• SGEMM with packed/reorder buffer support (aocl_gemm_f32f32f32f32)
• AMD “Zen4” support for BLIS
• Dynamic dispatch supports AMD “Zen4” configuration
• Optimizations and performance improvements for DGEMM, SGEMM, ZGEMM, DGEMMT, and DTRSM
• Framework design changes

AOCL-BLIS 3.2

New features:

• Extended BLAS function - DZGEMM
• Progress feature for xGEMM and xTRSM APIs: Time taken to complete the mathematical operations tends to increase exponentially with large input problem sizes; this feature provides users a periodic update on the operation progress.
• Runtime Threading control using OpenMP APIs
• Dynamic Dispatch covers APUs
• Improved detection of standard x86-64 feature support
• Minor bug fixes

Performance improvements in the following single-threaded and multi-threaded functions:

• DGEMM, SGEMM, ZGEMM, and CGEMM
• DTRSM, DGEMMT, ZTRSM, CTRSM, and DTRMM
• SGEMV, DHER2, ZTRSV, and DSYMV
• ?AXPBYV, SSCALV, DSCALV, ?DOTXV, and ZAXPY2V

AMD Optimized BLIS Version 3.1

AMD Optimized BLIS Version 3.1

Highlights of improvements on AMD EPYC^TM processor family CPUs

• Supports Dynamic Dispatch and AOCL Dynamic feature
• Improvements in DGEMM, ZGEMM, DTRSM, DSYRK, xGEMV, and DOTV

AMD Optimized BLIS Version 3.0.1

AMD Optimized BLIS Version 3.0.1

Highlights of improvements on AMD EPYC^TM processor family CPUs

• Improved performance of DGEMM for skinny matrix shapes.
• Improvements in SGEMM and ZGEMM
• Improved performance of Level-1 and Level2 BLAS routines, GEMV, DOT and AXPY routines
• Improvements in DTRSM for small matrix sizes

AMD Optimized BLIS Version 3.0

AMD Optimized BLIS Version 3.0

Highlights of improvements on AMD EPYC^TM processor family CPUs

• Includes support for AMD’s Zen3 architecture. Build can auto detect if it is running on zen3 and enable features and optimizations specific to zen3 architecture.
• Improved performance of ?dotv, ?gemv, ?axpyv for complex and double complex datatypes
• Includes support for copy transposition routines
• New BLAS extension APIs added including cblas_?cabs1, cblas_i?amin, cblas_?axpby, cblas_?gemm_batch, cblas_?gemm3m
• Debug trace and input logging support added for more BLIS APIs.