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Limit code alignement for GCC >= 9

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Ion Gaztañaga
2026-05-06 16:15:09 +02:00
parent b6f0114405
commit 5e09015223
1 changed files with 9 additions and 4 deletions
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experimental/bench_segmented_algos.cpp
+9 -4
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@@ -12,7 +12,11 @@
// alignment noise from benchmark measurements. Without this, identical code can
// show up to 1.8x performance variation depending on where the linker happens
// to place each template instantiation relative to 64-byte cache-line boundaries.
#if defined(__GNUC__) && !defined(__clang__)
// Requires GCC >= 9: GCC 8's #pragma GCC optimize applies optimization attributes
// to all functions in the TU, conflicting with __attribute__((always_inline)) on
// friend operators defined in headers (e.g. wrapped_iterator), causing
// -Werror=attributes errors.
#if defined(__GNUC__) && !defined(__clang__) && (__GNUC__ >= 9)
#pragma GCC optimize("align-functions=64", "align-loops=32")
#elif defined(__clang__)
// Clang has no file-wide pragma for alignment. Use command-line flags:
@@ -2491,10 +2495,10 @@ template<class T>
void run_benchmarks()
{
//#define SIMPLE_TEST
#define SIMPLE_TEST
#if defined(NDEBUG) && !defined(SIMPLE_TEST)
const std::size_t N = 100000;
const std::size_t iter = 3000;
const std::size_t iter = 2000;
#else
const std::size_t N = 10000;
const std::size_t iter = 1;
@@ -2505,7 +2509,8 @@ void run_benchmarks()
{
std::cout << "--- bc::deque<" << typeid(T).name() << "> ---\n";
bc::deque<T, void, bc::deque_options_t<bc::block_size<1024> > > dq;
typedef typename bc::deque_options < bc::block_size<1024> >::type block_size_opt_t;
bc::deque<T, void, block_size_opt_t> dq;
fill_test_data(dq, N);
run_all(dq, iter, "deque");
std::cout << "\n";