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Scalable Vector IR Type with further LTO fixes

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Reintroduces the scalable vector IR type from D32530, after it was reverted
a couple of times due to increasing chromium LTO build times. This latest
incarnation removes the walk over aggregate types from the verifier entirely,
in favor of rejecting scalable vectors in the isValidElementType methods in
ArrayType and StructType. This removes the 70% degradation observed with
the second repro tarball from PR42210.

Reviewers: thakis, hans, rengolin, sdesmalen

Reviewed By: sdesmalen

Differential Revision: https://reviews.llvm.org/D64079


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365203 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Graham Hunter
2019-07-05 12:48:16 +00:00
parent 1eed3a54bf
commit 6fea0a2262
20 changed files with 397 additions and 39 deletions
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6
lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -1878,7 +1878,8 @@ 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)
@@ -1886,7 +1887,8 @@ 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;
}