[PATCH] D136812: [RISCV] Drop single letter b extension support

[Kito Cheng via Phabricator via llvm-commits]

kito-cheng created this revision.
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It splited into several zb* extensions, and however `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)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136812

Files:
  clang/test/Driver/riscv-arch.c
  llvm/lib/Support/RISCVISAInfo.cpp


Index: llvm/lib/Support/RISCVISAInfo.cpp
===================================================================
--- llvm/lib/Support/RISCVISAInfo.cpp
+++ llvm/lib/Support/RISCVISAInfo.cpp
@@ -602,8 +602,8 @@
 
     // 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'",
Index: clang/test/Driver/riscv-arch.c
===================================================================
--- clang/test/Driver/riscv-arch.c
+++ clang/test/Driver/riscv-arch.c
@@ -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',


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