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[SVE][IR] Scalable Vector IR Type

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* Adds a 'scalable' flag to VectorType
* Adds an 'ElementCount' class to VectorType to pass (possibly scalable) vector lengths, with overloaded operators.
* Modifies existing helper functions to use ElementCount
* Adds support for serializing/deserializing to/from both textual and bitcode IR formats
* Extends the verifier to reject global variables of scalable types
* Updates documentation

See the latest version of the RFC here: http://lists.llvm.org/pipermail/llvm-dev/2018-July/124396.html

Reviewers: rengolin, lattner, echristo, chandlerc, hfinkel, rkruppe, samparker, SjoerdMeijer, greened, sebpop

Reviewed By: hfinkel, sebpop

Differential Revision: https://reviews.llvm.org/D32530

llvm-svn: 361953
This commit is contained in:
Graham Hunter
2019-05-29 12:22:54 +00:00
parent 4c5a0d1683
commit f4fc01f8dd
19 changed files with 479 additions and 39 deletions
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6
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -1758,7 +1758,8 @@ Error BitcodeReader::parseTypeTableBody() {
return error("Invalid type");
ResultTy = ArrayType::get(ResultTy, Record[0]);
break;
case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty]
case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] or
// [numelts, eltty, scalable]
if (Record.size() < 2)
return error("Invalid record");
if (Record[0] == 0)
@@ -1766,7 +1767,8 @@ Error BitcodeReader::parseTypeTableBody() {
ResultTy = getTypeByID(Record[1]);
if (!ResultTy || !StructType::isValidElementType(ResultTy))
return error("Invalid type");
ResultTy = VectorType::get(ResultTy, Record[0]);
bool Scalable = Record.size() > 2 ? Record[2] : false;
ResultTy = VectorType::get(ResultTy, Record[0], Scalable);
break;
}