[CodeGen][NEON] Emit constants for "immediate" intrinsic arguments.

On ARM/AArch64, we currently always use EmitScalarExpr for the immediate
builtin arguments, instead of directly emitting the constant. When the
overflow sanitizer is enabled, this generates overflow intrinsics
instead of constants, breaking assumptions in various places.

Instead, use the knowledge of "immediates" to directly emit a constant:
- teach the tablegen backend to emit the "immediate" modifiers
- use those modifiers in the NEON CodeGen, on ARM and AArch64.

Fixes PR23517.

Differential Revision: http://reviews.llvm.org/D10045

llvm-svn: 239002

1 files changed, 24 insertions, 8 deletions

diff --git a/clang/utils/TableGen/NeonEmitter.cpp b/clang/utils/TableGen/NeonEmitter.cpp
index b9871ebbb25..7644ae2c04d 100644
--- a/clang/utils/TableGen/NeonEmitter.cpp
+++ b/clang/utils/TableGen/NeonEmitter.cpp
@@ -131,7 +131,7 @@ class Type {
 private:
   TypeSpec TS;
 
-  bool Float, Signed, Void, Poly, Constant, Pointer;
+  bool Float, Signed, Immediate, Void, Poly, Constant, Pointer;
   // ScalarForMangling and NoManglingQ are really not suited to live here as
   // they are not related to the type. But they live in the TypeSpec (not the
   // prototype), so this is really the only place to store them.
@@ -140,13 +140,13 @@ private:
 
 public:
   Type()
-      : Float(false), Signed(false), Void(true), Poly(false), Constant(false),
-        Pointer(false), ScalarForMangling(false), NoManglingQ(false),
-        Bitwidth(0), ElementBitwidth(0), NumVectors(0) {}
+      : Float(false), Signed(false), Immediate(false), Void(true), Poly(false),
+        Constant(false), Pointer(false), ScalarForMangling(false),
+        NoManglingQ(false), Bitwidth(0), ElementBitwidth(0), NumVectors(0) {}
 
   Type(TypeSpec TS, char CharMod)
-      : TS(TS), Float(false), Signed(false), Void(false), Poly(false),
-        Constant(false), Pointer(false), ScalarForMangling(false),
+      : TS(TS), Float(false), Signed(false), Immediate(false), Void(false),
+        Poly(false), Constant(false), Pointer(false), ScalarForMangling(false),
         NoManglingQ(false), Bitwidth(0), ElementBitwidth(0), NumVectors(0) {
     applyModifier(CharMod);
   }
@@ -167,6 +167,7 @@ public:
   bool isFloating() const { return Float; }
   bool isInteger() const { return !Float && !Poly; }
   bool isSigned() const { return Signed; }
+  bool isImmediate() const { return Immediate; }
   bool isScalar() const { return NumVectors == 0; }
   bool isVector() const { return NumVectors > 0; }
   bool isFloat() const { return Float && ElementBitwidth == 32; }
@@ -192,6 +193,14 @@ public:
     Float = false;
     Poly = false;
     Signed = Sign;
+    Immediate = false;
+    ElementBitwidth = ElemWidth;
+  }
+  void makeImmediate(unsigned ElemWidth) {
+    Float = false;
+    Poly = false;
+    Signed = true;
+    Immediate = true;
     ElementBitwidth = ElemWidth;
   }
   void makeScalar() {
@@ -600,6 +609,12 @@ std::string Type::builtin_str() const {
   else if (isInteger() && !Pointer && !Signed)
     S = "U" + S;
 
+  // Constant indices are "int", but have the "constant expression" modifier.
+  if (isImmediate()) {
+    assert(isInteger() && isSigned());
+    S = "I" + S;
+  }
+
   if (isScalar()) {
     if (Constant) S += "C";
     if (Pointer) S += "*";
@@ -853,6 +868,7 @@ void Type::applyModifier(char Mod) {
     ElementBitwidth = Bitwidth = 32;
     NumVectors = 0;
     Signed = true;
+    Immediate = true;
     break;
   case 'l':
     Float = false;
@@ -860,6 +876,7 @@ void Type::applyModifier(char Mod) {
     ElementBitwidth = Bitwidth = 64;
     NumVectors = 0;
     Signed = false;
+    Immediate = true;
     break;
   case 'z':
     ElementBitwidth /= 2;
@@ -1019,9 +1036,8 @@ std::string Intrinsic::getBuiltinTypeStr() {
     if (LocalCK == ClassI)
       T.makeSigned();
 
-    // Constant indices are always just "int".
     if (hasImmediate() && getImmediateIdx() == I)
-      T.makeInteger(32, true);
+      T.makeImmediate(32);
 
     S += T.builtin_str();
   }