[ARM] add target arch definitions for 8.1-M and MVE

This adds:
- LLVM subtarget features to make all the new instructions conditional on,
- CPU and FPU names for use on clang's command line, with default FPUs set
  so that "armv8.1-m.main+fp" and "armv8.1-m.main+fp.dp" will select the right
  FPU features,
- architecture extension names "mve" and "mve.fp",
- ABI build attribute support for v8.1-M (a new value for Tag_CPU_arch) and MVE
  (a new actual tag).

Patch mostly by Simon Tatham.

Differential Revision: https://reviews.llvm.org/D60698

llvm-svn: 362090

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Support/Triple.cpp b/llvm/lib/Support/Triple.cpp
index caf39a761d7..eacfe3b6bf0 100644
--- a/llvm/lib/Support/Triple.cpp
+++ b/llvm/lib/Support/Triple.cpp
@@ -625,6 +625,8 @@ static Triple::SubArchType parseSubArch(StringRef SubArchName) {
     return Triple::ARMSubArch_v8m_baseline;
   case ARM::ArchKind::ARMV8MMainline:
     return Triple::ARMSubArch_v8m_mainline;
+  case ARM::ArchKind::ARMV8_1MMainline:
+    return Triple::ARMSubArch_v8_1m_mainline;
   default:
     return Triple::NoSubArch;
   }