Testsuite: Add AArch64 SVE support to slp-reduc-15.c
The slp-reduc-15.c test now supports AArch64 SVE and uses -mavx2 for x86 to cover all x86 modes.
The test case gcc.dg/vect/slp-reduc-15.c now includes AArch64 SVE support and uses -mavx2 for x86 to support all x86 modes. This enhancement ensures comprehensive testing of SLP vectorization across different architectures. The changes involve adding an aarch64-*-* target using -march=armv8.2-a+sve and separating -fgimple from architecture-specific options.
In Details
This commit extends the slp-reduc-15.c test case to include AArch64 SVE support using -march=armv8.2-a+sve. It also updates the x86 target to use -mavx2 instead of -march=x86-64-v3 to cover all x86 modes. This change ensures that SLP vectorization is thoroughly tested on both AArch64 and x86 architectures, providing better coverage for the SLP vectorizer.
For Context
The compiler uses Single Loop Vectorization (SLP) to combine similar independent calculations into vector operations, speeding up code execution. This commit updates a test case to ensure that SLP vectorization works correctly on AArch64 architecture with Scalable Vector Extension (SVE) and on all x86 modes. The test case verifies that the compiler can effectively vectorize code using SLP on these platforms.