[gouarin]

Checklist

• The title and commit message(s) are descriptive.
• Small commits made to fix your PR have been squashed to avoid history pollution.
• Tests have been added for new features or bug fixes.
• API of new functions and classes are documented (no public API changes).

Description

xtensor_fixed.buffer_adaptor multiplied an adapted row by a default-constructed xtensor_fixed:

xtensor_fixed<double, xshape<3>> a;  // elements not initialized, like std::array
xtensor<double, 2> b = zeros<double>({3, 3});
auto c = adapt(&b(0, 0), xshape<3>());
c *= a;                              // reads indeterminate values, checks nothing

GCC 13 at -O3 reports this read as -Wmaybe-uninitialized in the multiplies operator, and in xcontainer::load_simd with XTENSOR_USE_XSIMD. The warning is right: the bug is in the test, not in the library.

The operand is now initialized, the buffer starts at ones so the product shows, and the test checks the result. test_xfixed compiles without these warnings with GCC 13 -O3, with and without xsimd.

[codspeed]

Merging this PR will not alter performance

1 warning

⚠️ Unable to measure the execution of 1 benchmark

This benchmark measured no execution time, so its result is not comparable and counts as unchanged. This usually happens when the compiler removes the code under test.

Prevent compiler optimizations

See affected benchmarks

✅ 255 untouched benchmarks

---

_{Comparing gouarin:fix-xfixed-test-uninit (93fd3ac) with master (57f3d07)}