[PATCH] D44172: [analyzer] [PointerArithChecker] do not warn on indexes into vector types

[George Karpenkov via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rC326952: [analyzer] [PointerArithChecker] do not warn on indexes into vector types (authored by george.karpenkov, committed by ).
Herald added a subscriber: cfe-commits.

Repository:
  rC Clang

https://reviews.llvm.org/D44172

Files:
  lib/StaticAnalyzer/Checkers/PointerArithChecker.cpp
  test/Analysis/ptr-arith.c


Index: lib/StaticAnalyzer/Checkers/PointerArithChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/PointerArithChecker.cpp
+++ lib/StaticAnalyzer/Checkers/PointerArithChecker.cpp
@@ -308,6 +308,10 @@
   // Indexing with 0 is OK.
   if (Idx.isZeroConstant())
     return;
+
+  // Indexing vector-type expressions is also OK.
+  if (SubsExpr->getBase()->getType()->isVectorType())
+    return;
   reportPointerArithMisuse(SubsExpr->getBase(), C);
 }
 
Index: test/Analysis/ptr-arith.c
===================================================================
--- test/Analysis/ptr-arith.c
+++ test/Analysis/ptr-arith.c
@@ -347,3 +347,9 @@
   a[0] = 0;
 label:;
 }
+
+typedef __attribute__((__ext_vector_type__(2))) float simd_float2;
+float test_nowarning_on_vector_deref() {
+  simd_float2 x = {0, 1};
+  return x[1]; // no-warning
+}


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