Fraser Cormack a4729f7f88 [RISCV] Lower RVV vector SELECTs to VSELECTs
This patch optimizes the code generation of vector-type SELECTs (LLVM
select instructions with scalar conditions) by custom-lowering to
VSELECTs (LLVM select instructions with vector conditions) by splatting
the condition to a vector. This avoids the default expansion path which
would either introduce control flow or fully scalarize.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D104772
2021-06-24 10:12:51 +01:00
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2021-01-05 10:41:08 -08:00