[PATCH] D14639: LLDB JIT needs android vector passing rules.

[Aidan Dodds via cfe-commits]

ADodds created this revision.
ADodds added reviewers: asl, rsmith.
ADodds added subscribers: pirama, cfe-commits.
ADodds set the repository for this revision to rL LLVM.
Herald added subscribers: srhines, danalbert, tberghammer, aemerson.

Looking into some recent issues with LLDBs expression parser highlighted that upstream clang passes vectors types differently to Android Open Source Project's clang for Arm Android targets.
This patch reflects the changes present in the AOSP and allows LLDB's JIT expression evaluation to work correctly for Arm Android targets when passing vectors.

This is submitted with consent of the original author Stephen Hines.

Repository:
  rL LLVM

http://reviews.llvm.org/D14639

Files:
  lib/CodeGen/TargetInfo.cpp

Index: lib/CodeGen/TargetInfo.cpp
===================================================================
--- lib/CodeGen/TargetInfo.cpp
+++ lib/CodeGen/TargetInfo.cpp
@@ -4724,6 +4724,11 @@
     }
   }
 
+  bool isAndroid() const {
+    return (getTarget().getTriple().getEnvironment() ==
+            llvm::Triple::Android);
+  }
+
   ABIKind getABIKind() const { return Kind; }
 
 private:
@@ -5227,15 +5232,23 @@
 
 /// isIllegalVector - check whether Ty is an illegal vector type.
 bool ARMABIInfo::isIllegalVectorType(QualType Ty) const {
-  if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    // Check whether VT is legal.
-    unsigned NumElements = VT->getNumElements();
-    uint64_t Size = getContext().getTypeSize(VT);
-    // NumElements should be power of 2.
-    if ((NumElements & (NumElements - 1)) != 0)
-      return true;
-    // Size should be greater than 32 bits.
-    return Size <= 32;
+  if (const VectorType *VT = Ty->getAs<VectorType> ()) {
+    if (isAndroid()) {
+      // Check whether VT is legal.
+      unsigned NumElements = VT->getNumElements();
+      // NumElements should be power of 2 or equal to 3.
+      if ((NumElements & (NumElements - 1)) != 0 && NumElements != 3)
+        return true;
+    } else {
+      // Check whether VT is legal.
+      unsigned NumElements = VT->getNumElements();
+      uint64_t Size = getContext().getTypeSize(VT);
+      // NumElements should be power of 2.
+      if ((NumElements & (NumElements - 1)) != 0)
+        return true;
+      // Size should be greater than 32 bits.
+      return Size <= 32;
+    }
   }
   return false;
 }


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