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Author SHA1 Message Date
Craig Topper efcdd598b7 [RISCV] Teach VSETVLI inserter to use VSETIVLI when possible. 
We always create the VL operand using a register, but if we can
determine that it came from an ADDI X0, imm with a sufficiently
small immediate, we can use VSETIVLI.

Reviewed By: frasercrmck

Differential Revision: https://reviews.llvm.org/D97332
 2021-02-24 16:07:33 -08:00
Craig Topper 0c254b4a69 [RISCV] Add support for selecting vrgather.vx/vi for fixed vector splat shuffles. 
The test cases extract a fixed element from a vector and splat it
into a vector. This gets DAG combined into a splat shuffle.

I've used some very wide vectors in the test to make sure we have
at least a couple tests where the element doesn't fit into the
uimm5 immediate of vrgather.vi so we fall back to vrgather.vx.

Reviewed By: frasercrmck

Differential Revision: https://reviews.llvm.org/D96186
 2021-02-10 10:01:56 -08:00