[all-commits] [llvm/llvm-project] 2c60d5: [Flang] Support -mrvv-vector-bits flag (#77588)

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2c60d59864ed8b2b26c4f0683ee7a1816c6d951e
      https://github.com/llvm/llvm-project/commit/2c60d59864ed8b2b26c4f0683ee7a1816c6d951e
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-01-11 (Thu, 11 Jan 2024)

  Changed paths:
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/Flang.cpp
    M clang/lib/Driver/ToolChains/Flang.h
    M flang/test/Driver/driver-help-hidden.f90
    M flang/test/Driver/driver-help.f90
    A flang/test/Driver/riscv-rvv-vector-bits.f90

  Log Message:
  -----------
  [Flang] Support -mrvv-vector-bits flag (#77588)

This patch adds support for the -mrvv-vector-bits flag in the Flang
driver, and
translates them to -mvscale-min/-mvscale-max.

The code was copied from the Clang toolchain (similarly to what was done
for
AArch64's -msve-vector-bits flag) so it also supports the same
-mrvv-vector-bits=zvl mode.

Note that Flang doesn't yet define the __riscv_v_fixed_vlen macro, so
the help
text has been updated to highlight that it's only defined for Clang.