[PATCH] D156223: [RISCV] Resolve a few bugs in RISCVVIntrinsicUtils.cpp

[Brandon Wu via Phabricator via cfe-commits]

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This patch does a few things:

1. Add a new type called Undefined to ScalarTypeKind.
2. Make RVVType::applyModifier early return when encounter invalid ScalarType, otherwise it could be modified to "non-invalid" type in the following code.
3. When FixedLMULType::SmallerThan is applied, the lmul should be "<" than specified one, so lmuls which are ">=" should be marked as invalid.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156223

Files:
  clang/include/clang/Support/RISCVVIntrinsicUtils.h
  clang/lib/Sema/SemaRISCVVectorLookup.cpp
  clang/lib/Support/RISCVVIntrinsicUtils.cpp


Index: clang/lib/Support/RISCVVIntrinsicUtils.cpp
===================================================================
--- clang/lib/Support/RISCVVIntrinsicUtils.cpp
+++ clang/lib/Support/RISCVVIntrinsicUtils.cpp
@@ -742,6 +742,10 @@
     break;
   }
 
+  // Early return if the current type modifier is already invalid.
+  if (ScalarType == Invalid)
+    return;
+
   for (unsigned TypeModifierMaskShift = 0;
        TypeModifierMaskShift <= static_cast<unsigned>(TypeModifier::MaxOffset);
        ++TypeModifierMaskShift) {
@@ -803,13 +807,13 @@
 void RVVType::applyFixedLog2LMUL(int Log2LMUL, enum FixedLMULType Type) {
   switch (Type) {
   case FixedLMULType::LargerThan:
-    if (Log2LMUL < LMUL.Log2LMUL) {
+    if (Log2LMUL <= LMUL.Log2LMUL) {
       ScalarType = ScalarTypeKind::Invalid;
       return;
     }
     break;
   case FixedLMULType::SmallerThan:
-    if (Log2LMUL > LMUL.Log2LMUL) {
+    if (Log2LMUL >= LMUL.Log2LMUL) {
       ScalarType = ScalarTypeKind::Invalid;
       return;
     }
Index: clang/lib/Sema/SemaRISCVVectorLookup.cpp
===================================================================
--- clang/lib/Sema/SemaRISCVVectorLookup.cpp
+++ clang/lib/Sema/SemaRISCVVectorLookup.cpp
@@ -133,6 +133,7 @@
     }
     break;
   case Invalid:
+  case Undefined:
     llvm_unreachable("Unhandled type.");
   }
   if (Type->isVector()) {
Index: clang/include/clang/Support/RISCVVIntrinsicUtils.h
===================================================================
--- clang/include/clang/Support/RISCVVIntrinsicUtils.h
+++ clang/include/clang/Support/RISCVVIntrinsicUtils.h
@@ -218,6 +218,7 @@
   UnsignedInteger,
   Float,
   Invalid,
+  Undefined,
 };
 
 // Exponential LMUL
@@ -240,7 +241,7 @@
   friend class RVVTypeCache;
 
   BasicType BT;
-  ScalarTypeKind ScalarType = Invalid;
+  ScalarTypeKind ScalarType = Undefined;
   LMULType LMUL;
   bool IsPointer = false;
   // IsConstant indices are "int", but have the constant expression.


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