Craig Topper 411bb42eed [RISCV] Add a special case to treat riscv-v-vector-bits-min=-1 as meaning use Zvl*b value. ...

riscv-v-vector-bits-min is primarily used to opt-in to the
autovectorizer. The vector width can be determined from Zvl*b.

This patch adds support treating -1 as meaning use Zvl*b so we can
still opt-in to autovectorization without needing to repeat a
vector width already given by Zvl*b or -mcpu.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D124960

2022-05-04 14:26:45 -07:00

7.5 KiB

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