[IR] Add vscale_range IR function attribute

This attribute represents the minimum and maximum values vscale can
take. For now this attribute is not hooked up to anything during
codegen, this will be added in the future when such codegen is
considered stable.

Additionally hook up the -msve-vector-bits=<x> clang option to emit this
attribute.

Differential Revision: https://reviews.llvm.org/D98030

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index fd24329..951e32e 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1526,6 +1526,8 @@ static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
     return Attribute::SwiftSelf;
   case bitc::ATTR_KIND_UW_TABLE:
     return Attribute::UWTable;
+  case bitc::ATTR_KIND_VSCALE_RANGE:
+    return Attribute::VScaleRange;
   case bitc::ATTR_KIND_WILLRETURN:
     return Attribute::WillReturn;
   case bitc::ATTR_KIND_WRITEONLY:
@@ -1638,6 +1640,8 @@ Error BitcodeReader::parseAttributeGroupBlock() {
             B.addDereferenceableOrNullAttr(Record[++i]);
           else if (Kind == Attribute::AllocSize)
             B.addAllocSizeAttrFromRawRepr(Record[++i]);
+          else if (Kind == Attribute::VScaleRange)
+            B.addVScaleRangeAttrFromRawRepr(Record[++i]);
         } else if (Record[i] == 3 || Record[i] == 4) { // String attribute
           bool HasValue = (Record[i++] == 4);
           SmallString<64> KindStr;