[IR][CodeGen] Remove dependency on EVT from IR/Function.cpp. Move EVT to CodeGen layer.

Currently EVT is in the IR layer only because of Function.cpp needing a very small piece of the functionality of EVT::getEVTString(). The rest of EVT is used in codegen making CodeGen a better place for it.

The previous code converted a Type* to EVT and then called getEVTString. This was only expected to handle the primitive types from Type*. Since there only a few primitive types, we can just print them as strings directly.

Differential Revision: https://reviews.llvm.org/D45017

llvm-svn: 328806

1 files changed, 19 insertions, 8 deletions

diff --git a/llvm/lib/IR/Function.cpp b/llvm/lib/IR/Function.cpp
index 0349ecaff46..be50f623c91 100644
--- a/llvm/lib/IR/Function.cpp
+++ b/llvm/lib/IR/Function.cpp
@@ -44,7 +44,6 @@
 #include "llvm/IR/User.h"
 #include "llvm/IR/Value.h"
 #include "llvm/IR/ValueSymbolTable.h"
-#include "llvm/IR/ValueTypes.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -551,10 +550,7 @@ void Function::recalculateIntrinsicID() {
 /// which can't be confused with it's prefix.  This ensures we don't have
 /// collisions between two unrelated function types. Otherwise, you might
 /// parse ffXX as f(fXX) or f(fX)X.  (X is a placeholder for any other type.)
-/// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
-/// cases) fall back to the MVT codepath, where they could be mangled to
-/// 'x86mmx', for example; matching on derived types is not sufficient to mangle
-/// everything.
+///
 static std::string getMangledTypeStr(Type* Ty) {
   std::string Result;
   if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
@@ -582,11 +578,26 @@ static std::string getMangledTypeStr(Type* Ty) {
       Result += "vararg";
     // Ensure nested function types are distinguishable.
     Result += "f"; 
-  } else if (isa<VectorType>(Ty))
+  } else if (isa<VectorType>(Ty)) {
     Result += "v" + utostr(Ty->getVectorNumElements()) +
       getMangledTypeStr(Ty->getVectorElementType());
-  else if (Ty)
-    Result += EVT::getEVT(Ty).getEVTString();
+  } else if (Ty) {
+    switch (Ty->getTypeID()) {
+    default: llvm_unreachable("Unhandled type");
+    case Type::VoidTyID:      Result += "isVoid";   break;
+    case Type::MetadataTyID:  Result += "Metadata"; break;
+    case Type::HalfTyID:      Result += "f16";      break;
+    case Type::FloatTyID:     Result += "f32";      break;
+    case Type::DoubleTyID:    Result += "f64";      break;
+    case Type::X86_FP80TyID:  Result += "f80";      break;
+    case Type::FP128TyID:     Result += "f128";     break;
+    case Type::PPC_FP128TyID: Result += "ppcf128";  break;
+    case Type::X86_MMXTyID:   Result += "x86mmx";   break;
+    case Type::IntegerTyID:
+      Result += "i" + utostr(cast<IntegerType>(Ty)->getBitWidth());
+      break;
+    }
+  }
   return Result;
 }