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Add support for x86 SIMD (SSE, AVX2, AVX512) #3019

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@dhiltgen dhiltgen commented Jan 19, 2026

Proposed changes

This implements CPU support for SSE, AVX2, and AVX512.

Performance benchmarks on Linux on Xeon Silver 4410T

Baseline

build/cpu/benchmarks/cpp/autograd 
Benchmarks for Device(cpu, 0)
Timing independent_value_and_grad ... 1045.1 msec
Timing combined_value_and_grad ... 820.53 msec
build/cpu/benchmarks/cpp/irregular_strides 
Benchmarks for Device(cpu, 0)
Timing (1D strided) mx::add ... 8.4961 msec
Timing (2D regular) mx::add ... 52.833 msec
Timing (2D mx::transpose) mx::add ... 164.15 msec
Timing (2D broadcast dim 0) mx::add ... 54.399 msec
Timing (2D broadcast dim 1) mx::add ... 65.15 msec
Timing (3D regular) mx::add ... 964.25 msec
Timing (3D mx::transpose) mx::add ... 125.86 msec
Timing (3D broadcast dim 0) mx::add ... 108.47 msec
Timing (3D broadcast dim 1) mx::add ... 121.23 msec
Timing (3D broadcast dim 2) mx::add ... 124.37 msec
Timing (3D broadcast dims 0, 1) mx::add ... 122.26 msec
Timing (3D broadcast dims 0, 2) mx::add ... 124.11 msec
Timing (3D broadcast dims 1, 2) mx::add ... 124.32 msec
Timing (4D regular) mx::add ... 243.4 msec
Timing (4D mx::transpose) mx::add ... 394.88 msec
Timing (4D broadcast dims 0) mx::add ... 245.68 msec
Timing (4D broadcast dims 0, 1) mx::add ... 246.26 msec
Timing (4D broadcast dims 0, 1, 2) mx::add ... 240.81 msec
Timing (4D broadcast dims 0, 1, 3) mx::add ... 247.51 msec
Timing (4D broadcast dims 0, 2) mx::add ... 241.58 msec
Timing (4D broadcast dims 0, 2, 3) mx::add ... 251.94 msec
Timing (4D broadcast dims 0, 3) mx::add ... 245.79 msec
Timing (4D broadcast dims 1) mx::add ... 242.37 msec
Timing (4D broadcast dims 1, 2) mx::add ... 243.04 msec
Timing (4D broadcast dims 1, 2, 3) mx::add ... 246.65 msec
Timing (4D broadcast dims 1, 3) mx::add ... 245.55 msec
Timing (4D broadcast dims 2) mx::add ... 239.72 msec
Timing (4D broadcast dims 2, 3) mx::add ... 250.05 msec
Timing (4D broadcast dims 3) mx::add ... 249.97 msec
Timing (3D contiguous) reshape_fn ... 0.029417 msec
Timing (3D mx::transpose) reshape_fn ... 15.293 msec
Timing (3D mx::transpose dims 1 2) reshape_fn ... 5.7285 msec
Timing (3D broadcast dim 0) reshape_fn ... 5.4893 msec
Timing (3D broadcast dim 1) reshape_fn ... 6.1788 msec
Timing (3D broadcast dim 2) reshape_fn ... 6.6059 msec
Timing (3D broadcast dims 0, 1) reshape_fn ... 6.4205 msec
Timing (3D broadcast dims 0, 2) reshape_fn ... 6.4971 msec
Timing (3D broadcast dims 1, 2) reshape_fn ... 5.8452 msec
Timing (3D broadcast dims 1, 2, 3) reshape_fn ... 0.069857 msec
Timing (1D strided) mx::astype ... 1.4186 msec
Timing (2D regular) mx::astype ... 7.7479 msec
Timing (2D mx::transpose) mx::astype ... 7.5769 msec
Timing (2D broadcast dim 0) mx::astype ... 0.037381 msec
Timing (2D broadcast dim 1) mx::astype ... 0.038433 msec
build/cpu/benchmarks/cpp/single_ops 
Benchmarks for Device(cpu, 0)
Timing full_fp32 ... 1.4704 msec
Timing zeros_fp32 ... 1.1875 msec
Timing ones_fp32 ... 1.1991 msec
Timing arange_fp32 ... 0.30664 msec
Timing (mx::float32 to mx::int32) mx::astype ... 1.8467 msec
Timing (mx::float32 to mx::uint32) mx::astype ... 1.7991 msec
Timing (mx::int32 to mx::float32) mx::astype ... 1.8071 msec
Timing (bool to mx::float32) mx::astype ... 1.9098 msec
Timing (bool to mx::int32) mx::astype ... 1.7379 msec
Timing (bool to mx::uint32) mx::astype ... 1.7207 msec
Timing mlx::core::abs ... 11.506 msec
Timing mx::negative ... 12.429 msec
Timing mx::sign ... 36.409 msec
Timing mx::square ... 9.8157 msec
Timing mlx::core::sqrt ... 24.597 msec
Timing mx::rsqrt ... 31.692 msec
Timing mlx::core::exp ... 172.39 msec
Timing mlx::core::log ... 15.905 msec
Timing mx::add ... 11.865 msec
Timing mx::subtract ... 12.049 msec
Timing mx::multiply ... 12.134 msec
Timing mx::divide ... 12.519 msec
Timing mx::maximum ... 22.939 msec
Timing mx::minimum ... 23.061 msec
Timing mx::where ... 29.546 msec
Timing (scalar) mx::add ... 12.806 msec
Timing (vector-scalar) mx::subtract ... 12.791 msec
Timing (scalar-vector) mx::subtract ... 12.687 msec
Timing (scalar) mx::multiply ... 12.574 msec
Timing (vector-scalar) mx::divide ... 13.364 msec
Timing (scalar-vector) mx::divide ... 13.894 msec
Timing (scalar-vector) mx::where ... 18.881 msec
Timing (scalar-scalar broadcast) mx::add ... 0.039647 msec
Timing (scalar-scalar broadcast) mx::subtract ... 0.040571 msec
Timing (scalar-scalar broadcast) mx::multiply ... 0.039894 msec
Timing (scalar-scalar broadcast) mx::divide ... 0.040526 msec
Timing (scalar-scalar broadcast) mx::where ... 0.044474 msec
Timing (non-strided) mx::add ... 73.777 msec
Timing (strided) mx::add ... 376.97 msec
Timing uniform ... 118.93 msec
Timing normal ... 306.51 msec
Timing mx::equal ... 11.684 msec
Timing mx::greater ... 11.375 msec
Timing mx::greater_equal ... 11.588 msec
Timing mx::less ... 11.567 msec
Timing mx::less_equal ... 11.426 msec
Timing matvec ... 0.12616 msec
Timing matvec_transpose ... 0.11048 msec
Timing mx::matmul ... 25.82 msec
Timing transpose_matmul ... 25.38 msec
Timing sum_all ... 120.85 msec
Timing sum_along_0 ... 122.71 msec
Timing sum_along_1 ... 121.51 msec
Timing prod_all ... 124.39 msec
Timing all_true ... 118.07 msec
Timing all_along_0 ... 147.34 msec
Timing all_along_1 ... 118.97 msec
Timing any_true ... 116.83 msec
Timing argmin_along_0 ... 65.201 msec
Timing argmin_along_1 ... 35.45 msec
Timing max_along_0 ... 174.95 msec
Timing max_along_1 ... 167.43 msec
Timing min_along_0 ... 173.38 msec
Timing min_along_1 ... 157.96 msec
Timing embedding_lookup ... 0.13422 msec
Timing single_element_lookup ... 31.588 msec
Timing embedding_update ... 10.008 msec
Timing embedding_add ... 10.602 msec
Timing single_element_update ... 40.991 msec
Timing single_element_add ... 55.524 msec
Timing divmod_fused ... 0.11231 msec
Timing divmod_separate ... 0.13845 msec

SSE

build/cpu-sse/benchmarks/cpp/autograd 
Benchmarks for Device(cpu, 0)
Timing independent_value_and_grad ... 139.96 msec
Timing combined_value_and_grad ... 84.91 msec
build/cpu-sse/benchmarks/cpp/irregular_strides 
Benchmarks for Device(cpu, 0)
Timing (1D strided) mx::add ... 4.7285 msec
Timing (2D regular) mx::add ... 12.015 msec
Timing (2D mx::transpose) mx::add ... 67.34 msec
Timing (2D broadcast dim 0) mx::add ... 11.731 msec
Timing (2D broadcast dim 1) mx::add ... 10.165 msec
Timing (3D regular) mx::add ... 39.055 msec
Timing (3D mx::transpose) mx::add ... 100.49 msec
Timing (3D broadcast dim 0) mx::add ... 38.362 msec
Timing (3D broadcast dim 1) mx::add ... 38.756 msec
Timing (3D broadcast dim 2) mx::add ... 35.526 msec
Timing (3D broadcast dims 0, 1) mx::add ... 38.738 msec
Timing (3D broadcast dims 0, 2) mx::add ... 35.918 msec
Timing (3D broadcast dims 1, 2) mx::add ... 35.553 msec
Timing (4D regular) mx::add ... 78.329 msec
Timing (4D mx::transpose) mx::add ... 214.09 msec
Timing (4D broadcast dims 0) mx::add ... 77.425 msec
Timing (4D broadcast dims 0, 1) mx::add ... 77.135 msec
Timing (4D broadcast dims 0, 1, 2) mx::add ... 77.367 msec
Timing (4D broadcast dims 0, 1, 3) mx::add ... 71.45 msec
Timing (4D broadcast dims 0, 2) mx::add ... 77.459 msec
Timing (4D broadcast dims 0, 2, 3) mx::add ... 71.663 msec
Timing (4D broadcast dims 0, 3) mx::add ... 71.878 msec
Timing (4D broadcast dims 1) mx::add ... 77.451 msec
Timing (4D broadcast dims 1, 2) mx::add ... 77.567 msec
Timing (4D broadcast dims 1, 2, 3) mx::add ... 71.602 msec
Timing (4D broadcast dims 1, 3) mx::add ... 72.658 msec
Timing (4D broadcast dims 2) mx::add ... 77.39 msec
Timing (4D broadcast dims 2, 3) mx::add ... 71.081 msec
Timing (4D broadcast dims 3) mx::add ... 71.483 msec
Timing (3D contiguous) reshape_fn ... 0.07048 msec
Timing (3D mx::transpose) reshape_fn ... 7.3012 msec
Timing (3D mx::transpose dims 1 2) reshape_fn ... 4.3205 msec
Timing (3D broadcast dim 0) reshape_fn ... 4.0235 msec
Timing (3D broadcast dim 1) reshape_fn ... 4.2869 msec
Timing (3D broadcast dim 2) reshape_fn ... 4.3221 msec
Timing (3D broadcast dims 0, 1) reshape_fn ... 4.2899 msec
Timing (3D broadcast dims 0, 2) reshape_fn ... 4.3077 msec
Timing (3D broadcast dims 1, 2) reshape_fn ... 4.0351 msec
Timing (3D broadcast dims 1, 2, 3) reshape_fn ... 0.071582 msec
Timing (1D strided) mx::astype ... 1.0169 msec
Timing (2D regular) mx::astype ... 4.5678 msec
Timing (2D mx::transpose) mx::astype ... 4.4884 msec
Timing (2D broadcast dim 0) mx::astype ... 0.08198 msec
Timing (2D broadcast dim 1) mx::astype ... 0.082054 msec
build/cpu-sse/benchmarks/cpp/single_ops 
Benchmarks for Device(cpu, 0)
Timing full_fp32 ... 1.2566 msec
Timing zeros_fp32 ... 0.99179 msec
Timing ones_fp32 ... 0.96662 msec
Timing arange_fp32 ... 0.26623 msec
Timing (mx::float32 to mx::int32) mx::astype ... 1.0834 msec
Timing (mx::float32 to mx::uint32) mx::astype ... 1.193 msec
Timing (mx::int32 to mx::float32) mx::astype ... 1.2657 msec
Timing (bool to mx::float32) mx::astype ... 1.1877 msec
Timing (bool to mx::int32) mx::astype ... 1.0881 msec
Timing (bool to mx::uint32) mx::astype ... 1.0842 msec
Timing mlx::core::abs ... 2.4867 msec
Timing mx::negative ... 2.1311 msec
Timing mx::sign ... 5.7121 msec
Timing mx::square ... 2.0804 msec
Timing mlx::core::sqrt ... 1.922 msec
Timing mx::rsqrt ... 2.0272 msec
Timing mlx::core::exp ... 6.3711 msec
Timing mlx::core::log ... 7.2586 msec
Timing mx::add ... 2.8043 msec
Timing mx::subtract ... 2.8846 msec
Timing mx::multiply ... 2.7926 msec
Timing mx::divide ... 2.988 msec
Timing mx::maximum ... 6.601 msec
Timing mx::minimum ... 6.6399 msec
Timing mx::where ... 18.911 msec
Timing (scalar) mx::add ... 2.4642 msec
Timing (vector-scalar) mx::subtract ... 2.4544 msec
Timing (scalar-vector) mx::subtract ... 2.688 msec
Timing (scalar) mx::multiply ... 2.431 msec
Timing (vector-scalar) mx::divide ... 2.4385 msec
Timing (scalar-vector) mx::divide ... 2.6062 msec
Timing (scalar-vector) mx::where ... 10.712 msec
Timing (scalar-scalar broadcast) mx::add ... 0.087141 msec
Timing (scalar-scalar broadcast) mx::subtract ... 0.088643 msec
Timing (scalar-scalar broadcast) mx::multiply ... 0.086912 msec
Timing (scalar-scalar broadcast) mx::divide ... 0.088069 msec
Timing (scalar-scalar broadcast) mx::where ... 0.10348 msec
Timing (non-strided) mx::add ... 18.839 msec
Timing (strided) mx::add ... 109.83 msec
Timing uniform ... 52.687 msec
Timing normal ... 108.55 msec
Timing mx::equal ... 3.3605 msec
Timing mx::greater ... 3.416 msec
Timing mx::greater_equal ... 3.436 msec
Timing mx::less ... 3.3056 msec
Timing mx::less_equal ... 3.2785 msec
Timing matvec ... 0.13509 msec
Timing matvec_transpose ... 0.15689 msec
Timing mx::matmul ... 1.867 msec
Timing transpose_matmul ... 1.8566 msec
Timing sum_all ... 26.451 msec
Timing sum_along_0 ... 27.831 msec
Timing sum_along_1 ... 28.219 msec
Timing prod_all ... 25.506 msec
Timing all_true ... 68.328 msec
Timing all_along_0 ... 79.4 msec
Timing all_along_1 ... 68.867 msec
Timing any_true ... 63.689 msec
Timing argmin_along_0 ... 33.608 msec
Timing argmin_along_1 ... 19.081 msec
Timing max_along_0 ... 66.831 msec
Timing max_along_1 ... 64.081 msec
Timing min_along_0 ... 66.308 msec
Timing min_along_1 ... 64.064 msec
Timing embedding_lookup ... 0.1409 msec
Timing single_element_lookup ... 12.071 msec
Timing embedding_update ... 5.8033 msec
Timing embedding_add ... 5.7742 msec
Timing single_element_update ... 21.731 msec
Timing single_element_add ... 22.277 msec
Timing divmod_fused ... 0.15112 msec
Timing divmod_separate ... 0.17786 msec

AVX2

build/cpu-avx2/benchmarks/cpp/autograd 
Benchmarks for Device(cpu, 0)
Timing independent_value_and_grad ... 159.57 msec
Timing combined_value_and_grad ... 76.709 msec
build/cpu-avx2/benchmarks/cpp/irregular_strides 
Benchmarks for Device(cpu, 0)
Timing (1D strided) mx::add ... 5.0248 msec
Timing (2D regular) mx::add ... 8.3063 msec
Timing (2D mx::transpose) mx::add ... 95.716 msec
Timing (2D broadcast dim 0) mx::add ... 7.4883 msec
Timing (2D broadcast dim 1) mx::add ... 6.8755 msec
Timing (3D regular) mx::add ... 32.843 msec
Timing (3D mx::transpose) mx::add ... 109.13 msec
Timing (3D broadcast dim 0) mx::add ... 31.669 msec
Timing (3D broadcast dim 1) mx::add ... 32.777 msec
Timing (3D broadcast dim 2) mx::add ... 30.29 msec
Timing (3D broadcast dims 0, 1) mx::add ... 32.601 msec
Timing (3D broadcast dims 0, 2) mx::add ... 28.6 msec
Timing (3D broadcast dims 1, 2) mx::add ... 28.487 msec
Timing (4D regular) mx::add ... 66.448 msec
Timing (4D mx::transpose) mx::add ... 210.8 msec
Timing (4D broadcast dims 0) mx::add ... 62.956 msec
Timing (4D broadcast dims 0, 1) mx::add ... 61.08 msec
Timing (4D broadcast dims 0, 1, 2) mx::add ... 62.921 msec
Timing (4D broadcast dims 0, 1, 3) mx::add ... 58.33 msec
Timing (4D broadcast dims 0, 2) mx::add ... 63.231 msec
Timing (4D broadcast dims 0, 2, 3) mx::add ... 58.413 msec
Timing (4D broadcast dims 0, 3) mx::add ... 57.326 msec
Timing (4D broadcast dims 1) mx::add ... 61.786 msec
Timing (4D broadcast dims 1, 2) mx::add ... 61.027 msec
Timing (4D broadcast dims 1, 2, 3) mx::add ... 55.852 msec
Timing (4D broadcast dims 1, 3) mx::add ... 55.886 msec
Timing (4D broadcast dims 2) mx::add ... 60.811 msec
Timing (4D broadcast dims 2, 3) mx::add ... 55.67 msec
Timing (4D broadcast dims 3) mx::add ... 55.582 msec
Timing (3D contiguous) reshape_fn ... 0.067288 msec
Timing (3D mx::transpose) reshape_fn ... 7.3041 msec
Timing (3D mx::transpose dims 1 2) reshape_fn ... 4.3296 msec
Timing (3D broadcast dim 0) reshape_fn ... 4.0586 msec
Timing (3D broadcast dim 1) reshape_fn ... 4.1292 msec
Timing (3D broadcast dim 2) reshape_fn ... 4.0705 msec
Timing (3D broadcast dims 0, 1) reshape_fn ... 4.0959 msec
Timing (3D broadcast dims 0, 2) reshape_fn ... 4.076 msec
Timing (3D broadcast dims 1, 2) reshape_fn ... 4.0444 msec
Timing (3D broadcast dims 1, 2, 3) reshape_fn ... 0.069308 msec
Timing (1D strided) mx::astype ... 1.0742 msec
Timing (2D regular) mx::astype ... 4.5812 msec
Timing (2D mx::transpose) mx::astype ... 4.5891 msec
Timing (2D broadcast dim 0) mx::astype ... 0.086623 msec
Timing (2D broadcast dim 1) mx::astype ... 0.08862 msec
build/cpu-avx2/benchmarks/cpp/single_ops 
Benchmarks for Device(cpu, 0)
Timing full_fp32 ... 1.4496 msec
Timing zeros_fp32 ... 1.0436 msec
Timing ones_fp32 ... 1.0855 msec
Timing arange_fp32 ... 0.28111 msec
Timing (mx::float32 to mx::int32) mx::astype ... 1.1603 msec
Timing (mx::float32 to mx::uint32) mx::astype ... 1.2722 msec
Timing (mx::int32 to mx::float32) mx::astype ... 1.169 msec
Timing (bool to mx::float32) mx::astype ... 1.1483 msec
Timing (bool to mx::int32) mx::astype ... 1.1276 msec
Timing (bool to mx::uint32) mx::astype ... 1.0845 msec
Timing mlx::core::abs ... 1.4866 msec
Timing mx::negative ... 1.4133 msec
Timing mx::sign ... 3.5585 msec
Timing mx::square ... 1.3479 msec
Timing mlx::core::sqrt ... 1.354 msec
Timing mx::rsqrt ... 1.3551 msec
Timing mlx::core::exp ... 5.9196 msec
Timing mlx::core::log ... 6.1033 msec
Timing mx::add ... 1.9016 msec
Timing mx::subtract ... 1.9204 msec
Timing mx::multiply ... 1.8753 msec
Timing mx::divide ... 1.9132 msec
Timing mx::maximum ... 4.1294 msec
Timing mx::minimum ... 3.9875 msec
Timing mx::where ... 19.369 msec
Timing (scalar) mx::add ... 1.6116 msec
Timing (vector-scalar) mx::subtract ... 1.6221 msec
Timing (scalar-vector) mx::subtract ... 1.676 msec
Timing (scalar) mx::multiply ... 1.6324 msec
Timing (vector-scalar) mx::divide ... 1.6095 msec
Timing (scalar-vector) mx::divide ... 1.7195 msec
Timing (scalar-vector) mx::where ... 10.637 msec
Timing (scalar-scalar broadcast) mx::add ... 0.094488 msec
Timing (scalar-scalar broadcast) mx::subtract ... 0.09362 msec
Timing (scalar-scalar broadcast) mx::multiply ... 0.093646 msec
Timing (scalar-scalar broadcast) mx::divide ... 0.094245 msec
Timing (scalar-scalar broadcast) mx::where ... 0.10962 msec
Timing (non-strided) mx::add ... 11.898 msec
Timing (strided) mx::add ... 110.47 msec
Timing uniform ... 41.87 msec
Timing normal ... 72.403 msec
Timing mx::equal ... 4.1518 msec
Timing mx::greater ... 4.3036 msec
Timing mx::greater_equal ... 4.2984 msec
Timing mx::less ... 4.2256 msec
Timing mx::less_equal ... 4.1683 msec
Timing matvec ... 0.14507 msec
Timing matvec_transpose ... 0.16682 msec
Timing mx::matmul ... 1.9423 msec
Timing transpose_matmul ... 1.8716 msec
Timing sum_all ... 13.26 msec
Timing sum_along_0 ... 18.401 msec
Timing sum_along_1 ... 13.413 msec
Timing prod_all ... 13.464 msec
Timing all_true ... 59.969 msec
Timing all_along_0 ... 78.839 msec
Timing all_along_1 ... 60.077 msec
Timing any_true ... 61.031 msec
Timing argmin_along_0 ... 33.479 msec
Timing argmin_along_1 ... 19.232 msec
Timing max_along_0 ... 39.924 msec
Timing max_along_1 ... 39.488 msec
Timing min_along_0 ... 40.309 msec
Timing min_along_1 ... 39.403 msec
Timing embedding_lookup ... 0.14394 msec
Timing single_element_lookup ... 11.911 msec
Timing embedding_update ... 5.7638 msec
Timing embedding_add ... 5.6913 msec
Timing single_element_update ... 21.044 msec
Timing single_element_add ... 21.852 msec
Timing divmod_fused ... 0.21375 msec
Timing divmod_separate ... 0.28181 msec

AVX512

build/cpu-avx512/benchmarks/cpp/autograd 
Benchmarks for Device(cpu, 0)
Timing independent_value_and_grad ... 109.05 msec
Timing combined_value_and_grad ... 63.535 msec
build/cpu-avx512/benchmarks/cpp/irregular_strides 
Benchmarks for Device(cpu, 0)
Timing (1D strided) mx::add ... 4.8721 msec
Timing (2D regular) mx::add ... 5.243 msec
Timing (2D mx::transpose) mx::add ... 67.211 msec
Timing (2D broadcast dim 0) mx::add ... 4.9516 msec
Timing (2D broadcast dim 1) mx::add ... 4.0123 msec
Timing (3D regular) mx::add ... 25.265 msec
Timing (3D mx::transpose) mx::add ... 106.37 msec
Timing (3D broadcast dim 0) mx::add ... 24.588 msec
Timing (3D broadcast dim 1) mx::add ... 25.514 msec
Timing (3D broadcast dim 2) mx::add ... 28.413 msec
Timing (3D broadcast dims 0, 1) mx::add ... 26.843 msec
Timing (3D broadcast dims 0, 2) mx::add ... 24.925 msec
Timing (3D broadcast dims 1, 2) mx::add ... 24.157 msec
Timing (4D regular) mx::add ... 49.665 msec
Timing (4D mx::transpose) mx::add ... 218.96 msec
Timing (4D broadcast dims 0) mx::add ... 50.408 msec
Timing (4D broadcast dims 0, 1) mx::add ... 49.538 msec
Timing (4D broadcast dims 0, 1, 2) mx::add ... 49.76 msec
Timing (4D broadcast dims 0, 1, 3) mx::add ... 45.57 msec
Timing (4D broadcast dims 0, 2) mx::add ... 51.235 msec
Timing (4D broadcast dims 0, 2, 3) mx::add ... 47.242 msec
Timing (4D broadcast dims 0, 3) mx::add ... 47.109 msec
Timing (4D broadcast dims 1) mx::add ... 50.02 msec
Timing (4D broadcast dims 1, 2) mx::add ... 49.516 msec
Timing (4D broadcast dims 1, 2, 3) mx::add ... 46.862 msec
Timing (4D broadcast dims 1, 3) mx::add ... 45.302 msec
Timing (4D broadcast dims 2) mx::add ... 49.689 msec
Timing (4D broadcast dims 2, 3) mx::add ... 44.973 msec
Timing (4D broadcast dims 3) mx::add ... 47.217 msec
Timing (3D contiguous) reshape_fn ... 0.069337 msec
Timing (3D mx::transpose) reshape_fn ... 7.3935 msec
Timing (3D mx::transpose dims 1 2) reshape_fn ... 4.169 msec
Timing (3D broadcast dim 0) reshape_fn ... 4.0922 msec
Timing (3D broadcast dim 1) reshape_fn ... 4.1342 msec
Timing (3D broadcast dim 2) reshape_fn ... 4.1673 msec
Timing (3D broadcast dims 0, 1) reshape_fn ... 4.1226 msec
Timing (3D broadcast dims 0, 2) reshape_fn ... 4.1619 msec
Timing (3D broadcast dims 1, 2) reshape_fn ... 4.0794 msec
Timing (3D broadcast dims 1, 2, 3) reshape_fn ... 0.071931 msec
Timing (1D strided) mx::astype ... 1.0185 msec
Timing (2D regular) mx::astype ... 4.5763 msec
Timing (2D mx::transpose) mx::astype ... 4.5577 msec
Timing (2D broadcast dim 0) mx::astype ... 0.089004 msec
Timing (2D broadcast dim 1) mx::astype ... 0.086812 msec
build/cpu-avx512/benchmarks/cpp/single_ops 
Benchmarks for Device(cpu, 0)
Timing full_fp32 ... 1.2871 msec
Timing zeros_fp32 ... 1.4398 msec
Timing ones_fp32 ... 1.4539 msec
Timing arange_fp32 ... 0.27884 msec
Timing (mx::float32 to mx::int32) mx::astype ... 1.1837 msec
Timing (mx::float32 to mx::uint32) mx::astype ... 1.1805 msec
Timing (mx::int32 to mx::float32) mx::astype ... 1.0768 msec
Timing (bool to mx::float32) mx::astype ... 1.1042 msec
Timing (bool to mx::int32) mx::astype ... 1.0646 msec
Timing (bool to mx::uint32) mx::astype ... 1.0665 msec
Timing mlx::core::abs ... 0.94824 msec
Timing mx::negative ... 1.0396 msec
Timing mx::sign ... 1.8795 msec
Timing mx::square ... 0.94696 msec
Timing mlx::core::sqrt ... 0.97706 msec
Timing mx::rsqrt ... 1.0015 msec
Timing mlx::core::exp ... 6.0047 msec
Timing mlx::core::log ... 6.3887 msec
Timing mx::add ... 1.2969 msec
Timing mx::subtract ... 1.2823 msec
Timing mx::multiply ... 1.2448 msec
Timing mx::divide ... 1.2415 msec
Timing mx::maximum ... 2.1673 msec
Timing mx::minimum ... 2.1821 msec
Timing mx::where ... 19.398 msec
Timing (scalar) mx::add ... 1.0311 msec
Timing (vector-scalar) mx::subtract ... 1.0203 msec
Timing (scalar-vector) mx::subtract ... 1.0587 msec
Timing (scalar) mx::multiply ... 1.1047 msec
Timing (vector-scalar) mx::divide ... 1.1687 msec
Timing (scalar-vector) mx::divide ... 1.1195 msec
Timing (scalar-vector) mx::where ... 10.633 msec
Timing (scalar-scalar broadcast) mx::add ... 0.097409 msec
Timing (scalar-scalar broadcast) mx::subtract ... 0.095516 msec
Timing (scalar-scalar broadcast) mx::multiply ... 0.095917 msec
Timing (scalar-scalar broadcast) mx::divide ... 0.095564 msec
Timing (scalar-scalar broadcast) mx::where ... 0.1068 msec
Timing (non-strided) mx::add ... 9.2285 msec
Timing (strided) mx::add ... 106.65 msec
Timing uniform ... 43.132 msec
Timing normal ... 64.343 msec
Timing mx::equal ... 2.8174 msec
Timing mx::greater ... 3.0892 msec
Timing mx::greater_equal ... 2.7417 msec
Timing mx::less ... 2.9577 msec
Timing mx::less_equal ... 2.8655 msec
Timing matvec ... 0.1461 msec
Timing matvec_transpose ... 0.16985 msec
Timing mx::matmul ... 1.8523 msec
Timing transpose_matmul ... 1.8644 msec
Timing sum_all ... 7.5322 msec
Timing sum_along_0 ... 11.248 msec
Timing sum_along_1 ... 8.4241 msec
Timing prod_all ... 7.9362 msec
Timing all_true ... 66.383 msec
Timing all_along_0 ... 75.197 msec
Timing all_along_1 ... 62.047 msec
Timing any_true ... 62.982 msec
Timing argmin_along_0 ... 33.948 msec
Timing argmin_along_1 ... 19.316 msec
Timing max_along_0 ... 40.734 msec
Timing max_along_1 ... 41.681 msec
Timing min_along_0 ... 40.69 msec
Timing min_along_1 ... 41.707 msec
Timing embedding_lookup ... 0.14615 msec
Timing single_element_lookup ... 11.918 msec
Timing embedding_update ... 5.6884 msec
Timing embedding_add ... 5.843 msec
Timing single_element_update ... 21.232 msec
Timing single_element_add ... 21.481 msec
Timing divmod_fused ... 0.14024 msec
Timing divmod_separate ... 0.19276 msec

Checklist

Put an x in the boxes that apply.

  • I have read the CONTRIBUTING document
  • I have run pre-commit run --all-files to format my code / installed pre-commit prior to committing changes
  • I have added tests that prove my fix is effective or that my feature works
  • I have updated the necessary documentation (if needed)

@dhiltgen dhiltgen changed the title Add support for x85 SIMD (SSE, AVX2, AVX512) Add support for x86 SIMD (SSE, AVX2, AVX512) Jan 19, 2026
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