Commits on Nov 5, 2024

1. Configure.cmake: improve and unify RISC-V vector extension checks …

   To test for the RISC-V vector extension (RVV), we currently run two
   small programs -- one for each value of LMUL=1,2 -- that use some
   vector intrinsics from the v0.11.x draft of the intrinsics spec. The
   library itself however needs newer intrinsics than the ones that we
   test for. This can lead to a problem because GCC 13 supports the
   intrinsics that we test for, but not (all of) the ones we intend to
   use. In short, the build can fail with GCC 13:
   
     shibatch#579
   
   This commit changes the detection mechanism. Instead of compiling a
   program that makes use of the intrinsics, we now just check the two
   values, __riscv_v and __riscv_v_intrinsic, to ensure that we have
   version 1.0 of the vector extension and version 0.12 of the
   intrinsics. These should be the stable versions of each.
   
   Note: the "m1" and "m2" checks are now identical because they are both
   covered by the official spec.
   
   Fixes shibatch#579

   

   orlitzky committed Nov 5, 2024
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