[AArch64][SVE] Asm: Fix predicate pattern diagnostics.

This patch uses the DiagnosticPredicate for SVE predicate patterns
to improve their diagnostics, now giving a 'invalid operand' diagnostic
if the type is not an immediate or one of the expected pattern
labels.

Reviewers: samparker, SjoerdMeijer, javed.absar, fhahn

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D48220

llvm-svn: 334983

1 files changed, 6 insertions, 4 deletions

diff --git a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
index c34ecb24fb5..d042370acf4 100644
--- a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -573,14 +573,16 @@ public:
     return DiagnosticPredicateTy::NearMatch;
   }
 
-  bool isSVEPattern() const {
+  DiagnosticPredicate isSVEPattern() const {
     if (!isImm())
-      return false;
+      return DiagnosticPredicateTy::NoMatch;
     auto *MCE = dyn_cast<MCConstantExpr>(getImm());
     if (!MCE)
-      return false;
+      return DiagnosticPredicateTy::NoMatch;
     int64_t Val = MCE->getValue();
-    return Val >= 0 && Val < 32;
+    if (Val >= 0 && Val < 32)
+      return DiagnosticPredicateTy::Match;
+    return DiagnosticPredicateTy::NearMatch;
   }
 
   bool isSymbolicUImm12Offset(const MCExpr *Expr, unsigned Scale) const {