[libc-commits] [libc] [libc] DRAFT: Add Generic and NVPTX Sin Benchmark (PR #99795)

[Joseph Huber via libc-commits]

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@@ -102,6 +105,56 @@ class Benchmark {
     return benchmark(options, func);
   }
 };
+
+// We want our random values to be approximately
+// |real value| <= 2^(max_exponent) * (1 + (random 52 bits) * 2^-52) <
+// 2^(max_exponent + 1)
+// The largest integer that can be stored in a double is 2^53
+static constexpr int MAX_EXPONENT = 52;
+static constexpr int RANDOM_INPUT_SIZE = 1024;
+static cpp::array<double, RANDOM_INPUT_SIZE> random_input;
+
+static double get_rand() {
+  using FPBits = LIBC_NAMESPACE::fputil::FPBits<double>;
+  uint64_t bits = LIBC_NAMESPACE::rand();
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jhuber6 wrote:

I also wonder if we should make a reeantrant version of `rand` so we can have a state private to each thread instead of the shared state.

I.e.
`val = rand_r(&state)`

https://github.com/llvm/llvm-project/pull/99795