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[RISCV] Drop single letter b extension support

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It splited into several zb* extensions, and `b` is dropped after
0.93, so it time to retired that as other non-ratified zb* extensions.

Currntly clang can accept that with warning:

$ clang -target riscv64-elf ~/hello.c -S  -march=rv64gcb
'+b' is not a recognized feature for this target (ignoring feature)
'+b' is not a recognized feature for this target (ignoring feature)
'+b' is not a recognized feature for this target (ignoring feature)

Reviewed By: asb, luismarques

Differential Revision: https://reviews.llvm.org/D136812
This commit is contained in:
Kito Cheng 2022-10-27 23:45:59 +08:00
parent 995d556f42
commit ae116f43ff
2 changed files with 7 additions and 2 deletions
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5
clang/test/Driver/riscv-arch.c
View File

@ -258,6 +258,11 @@
// RV32-STD: error: invalid arch name 'rv32imqc',
// RV32-STD: unsupported standard user-level extension 'q'
// RUN: %clang --target=riscv32-unknown-elf -march=rv32ib -### %s \
// RUN: -fsyntax-only 2>&1 | FileCheck -check-prefix=RV32-B %s
// RV32-B: error: invalid arch name 'rv32ib',
// RV32-B: unsupported standard user-level extension 'b'
// RUN: %clang --target=riscv32-unknown-elf -march=rv32xabc -### %s \
// RUN: -fsyntax-only 2>&1 | FileCheck -check-prefix=RV32X %s
// RV32X: error: invalid arch name 'rv32xabc',

4
llvm/lib/Support/RISCVISAInfo.cpp
View File

@ -602,8 +602,8 @@ RISCVISAInfo::parseArchString(StringRef Arch, bool EnableExperimentalExtension,
// The order is OK, then push it into features.
// TODO: Use version number when setting target features
// Currently LLVM supports only "mafdcbv".
StringRef SupportedStandardExtension = "mafdcbv";
// Currently LLVM supports only "mafdcv".
StringRef SupportedStandardExtension = "mafdcv";
if (!SupportedStandardExtension.contains(C))
return createStringError(errc::invalid_argument,
"unsupported standard user-level extension '%c'",