From: Lei Zhang <antiagainst@google.com>
Date: Fri, 24 Apr 2020 19:33:03 +0000 (-0400)
Subject: Revert "[mlir][drr] NFC: avoid SmallVector when collecting substitution values"
X-Git-Tag: llvmorg-12-init~7900
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=60f1d2636626a0b92b6ad2cb86eea78cb1cd7b33;p=platform%2Fupstream%2Fllvm.git

Revert "[mlir][drr] NFC: avoid SmallVector when collecting substitution values"

This reverts commit 2f8b164ca220f8cd29d70c8359ed91e8fb8d9959, which
causes a breakage on Clang 5.
---

diff --git a/mlir/lib/TableGen/Pattern.cpp b/mlir/lib/TableGen/Pattern.cpp
index 7fb3a96..b04c8e2 100644
--- a/mlir/lib/TableGen/Pattern.cpp
+++ b/mlir/lib/TableGen/Pattern.cpp
@@ -345,7 +345,7 @@ std::string tblgen::SymbolInfoMap::SymbolInfo::getAllRangeUse(
   case Kind::Value: {
     assert(index < 0 && "only allowed for symbol bound to result");
     assert(op == nullptr);
-    auto repl = formatv(fmt, formatv("ValueRange{{{0}}", name));
+    auto repl = formatv(fmt, formatv("{{{0}}", name));
     LLVM_DEBUG(llvm::dbgs() << repl << " (Value)\n");
     return std::string(repl);
   }
diff --git a/mlir/tools/mlir-tblgen/RewriterGen.cpp b/mlir/tools/mlir-tblgen/RewriterGen.cpp
index 8e8decc..62638e6 100644
--- a/mlir/tools/mlir-tblgen/RewriterGen.cpp
+++ b/mlir/tools/mlir-tblgen/RewriterGen.cpp
@@ -612,8 +612,15 @@ void PatternEmitter::emitRewriteLogic() {
       auto val = handleResultPattern(resultTree, offsets[i], 0);
       os.indent(4) << "\n";
       // Resolve each symbol for all range use so that we can loop over them.
+      // We need an explicit cast to `SmallVector` to capture the cases where
+      // `{0}` resolves to an `Operation::result_range` as well as cases that
+      // are not iterable (e.g. vector that gets wrapped in additional braces by
+      // RewriterGen).
+      // TODO(b/147096809): Revisit the need for materializing a vector.
       os << symbolInfoMap.getAllRangeUse(
-          val, "    for (Value v : {0}) {{ tblgen_repl_values.push_back(v); }",
+          val,
+          "    for (auto v : SmallVector<Value, 4>{ {0} }) {{ "
+          "tblgen_repl_values.push_back(v); }",
           "\n");
     }
     os.indent(4) << "\n";