08ff017fb0
This patch improves the GPU benchmarking in this way: * Replace `rand`/`srand` with a deterministic per-thread RNG seeded by `call_index`: reproducible, apples-to-apples libc vs vendor comparisons. * Fix input generation: sample the unbiased exponent uniformly in `[min_exp, max_exp]`, clamp bounds, and skip `Inf`, `NaN`, `-0.0`, and `+0.0`. * Fix standard deviation: use an explicit estimator from sums and sums-of-squares (`sqrt(E[x^2] − E[x]^2)`) across samples. * Fix throughput overhead: subtract a loop-only baseline inside NVPTX/AMDGPU timing backends so `benchmark()` gets cycles-per-call already corrected (no `overhead()` call). * Adapt existing math benchmarks to the new RNG/timing plumbing (plumb `call_index`, drop `rand/srand`, clean includes). * Correct inter-thread aggregation: use iteration-weighted pooling to compute the global mean/variance, ensuring statistically sound `Cycles (Mean)` and `Stddev`. * Remove `Time / Iteration` column from the results table: it reported per-thread convergence time (not per-call latency) and was redundant/misleading next to `Cycles (Mean)`. * Remove unused `BenchmarkLogger` files: dead code that added maintenance and cognitive overhead without providing functionality. --- ## TODO (before merge) * [ ] Investigate compiler warnings and address their root causes. * [x] Review how per-thread results are aggregated into the overall result. ## Follow-ups (future PRs) * Add support to run throughput benchmarks with uniform (linear) input distributions, alongside the current log2-uniform scheme. * Review/adjust the configuration and coverage of existing math benchmarks. * Add more math benchmarks (e.g., `exp`/`expf`, others).
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.