[RVV 0.7.1] Add pragma about rvv 0.7.1

[imkiva]

This PR is the first step towards rvv 0.7.1, including:

• Added a new pragma for rvv 0.7.1 as #pragma clang riscv intrinsic vector0p7
• Added support for specifying vector extension version in -march as v0p7 (instead of v which stands for rvv 1.0)
• Clang now tells cc1 -target-feature +v0p7 instead of +v, (though this is unnecessary at the moment, but it may help the assembler to choose the correct binary encoding).
• Updated unit tests

Future work:

• TableGen for something like riscv_vector0p7.td, much like the approach here: https://reviews.llvm.org/D148308

[imkiva]

Currently, the MC is complaining

'+v0p7' is not a recognized feature for this target (ignoring feature)

We might need patches from certain repos that implemented the assembler for RVV 0.7.1

[imkiva]

ninja check-all reports:

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
********************
Failed Tests (7):
  Clang :: Driver/baremetal.cpp
  Clang :: Driver/csky-toolchain.c
  Clang :: Driver/freebsd-include-paths.c
  Clang :: Driver/hexagon-toolchain-linux.c
  Clang :: Driver/riscv32-toolchain-extra.c
  Clang :: Driver/riscv64-toolchain-extra.c
  Clang :: LibClang/symbols.test


Testing Time: 811.14s
  Skipped          :   475
  Unsupported      : 35189
  Passed           : 53047
  Expectedly Failed:    60
  Failed           :     7
FAILED: CMakeFiles/check-all /home/kiva/buildhost/CMakeFiles/check-all 

[ChunyuLiao]

Need to fix the ninja check Failed Tests.

[imkiva]

Need to fix the ninja check Failed Tests.

ninja check still reports the failure mentioned above without this PR. The problem does not go here I suspect.

[imkiva]

Most of the failing tests use targets other than RISC-V (like x86, ppc, aarch64, etc.), which are not enabled in my local environment. And riscv32-toolchain-extra and riscv64-toolchain-extra are failing because I predefined the default sysroot through cmake macros, which may prevent the setting of -internal-isystem(?). See tmux-history-5-1-1-20230725T220301.log

Update: I revisited the log and found all of them failed to match something after -internal-isystem, and my predefined sysroot always kicks in there.

Anyway, we might need a CI to run these checks to avoid problems caused by different local setups.

For debugging purposes, this is my cmake configuration:

-G Ninja
-DCMAKE_C_COMPILER_LAUNCHER="ccache;distcc"
-DCMAKE_CXX_COMPILER_LAUNCHER="ccache;distcc"
-DLLVM_ENABLE_PROJECTS="clang"
-DLLVM_TARGETS_TO_BUILD="RISCV"
-DBUILD_SHARED_LIBS=true
-DLLVM_USE_LINKER=mold
-DDEFAULT_SYSROOT="/home/kiva/tools/riscv/sysroot"
-DLLVM_DEFAULT_TARGET_TRIPLE="riscv64-unknown-linux-gnu"

[imkiva]

Yes! I see #2 adding the CI, thanks!!!

[imkiva]

I switched cmake configuration as here. See tmux-history-6-1-1-20230725T225645.log

Testing Time: 328.50s
  Skipped          :    24
  Unsupported      :  1974
  Passed           : 86810
  Expectedly Failed:   178

[ChunyuLiao]

ok， thanks.

[imkiva]

ok， thanks.

Thank you!