Fixes experimental::__is_x86_pd() in libstdc++.
Corrects macro names and refactors experimental x86 SIMD detection in libstdc++.
This commit fixes macro names and refactors the __is_x86_pd() macro in the experimental SIMD (Single Instruction, Multiple Data) support of the C++ standard library (libstdc++). The changes aim to reduce instantiations and improve the reliability of x86 platform detection for SIMD operations. This ensures that the library correctly identifies and utilizes the appropriate SIMD instructions on x86 processors.
In Details
The commit addresses PR libstdc++/124657 by fixing macro names and refactoring __is_x86_pd in libstdc++-v3/include/experimental/bits/simd_x86.h to reduce instantiations.
For Context
This commit fixes a bug in the C++ standard library (libstdc++) related to Single Instruction, Multiple Data (SIMD) support on x86 processors. SIMD allows processors to perform the same operation on multiple data points simultaneously, improving performance for certain types of computations. The bug involved incorrect macro definitions used to detect x86 processors with specific SIMD capabilities. This fix ensures that the library correctly identifies the processor's capabilities and utilizes SIMD instructions effectively.