From 3e2f74e6d6dbc07563ba8ee9ffd2a230514929fb Mon Sep 17 00:00:00 2001
From: Jay Foad <jay.foad@gmail.com>
Date: Mon, 4 Apr 2011 07:44:02 +0000
Subject: [PATCH] Remove some support for ReturnInsts with multiple operands,
 and for returning a scalar value in a function whose return type is a single-
 element structure or array.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128810 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/CBackend/CBackend.cpp              | 18 ------------
 lib/Transforms/IPO/IPConstantPropagation.cpp  |  2 +-
 lib/VMCore/Verifier.cpp                       | 28 +++----------------
 .../aggregate-return-single-value.ll          |  6 ----
 4 files changed, 5 insertions(+), 49 deletions(-)

diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 6c555a3e9d1..358d1b35b66 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -2440,24 +2440,6 @@ void CWriter::visitReturnInst(ReturnInst &I) {
     return;
   }
 
-  if (I.getNumOperands() > 1) {
-    Out << "  {\n";
-    Out << "    ";
-    printType(Out, I.getParent()->getParent()->getReturnType());
-    Out << "   llvm_cbe_mrv_temp = {\n";
-    for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
-      Out << "      ";
-      writeOperand(I.getOperand(i));
-      if (i != e - 1)
-        Out << ",";
-      Out << "\n";
-    }
-    Out << "    };\n";
-    Out << "    return llvm_cbe_mrv_temp;\n";
-    Out << "  }\n";
-    return;
-  }
-
   Out << "  return";
   if (I.getNumOperands()) {
     Out << ' ';
diff --git a/lib/Transforms/IPO/IPConstantPropagation.cpp b/lib/Transforms/IPO/IPConstantPropagation.cpp
index c7c293987a5..25c01346642 100644
--- a/lib/Transforms/IPO/IPConstantPropagation.cpp
+++ b/lib/Transforms/IPO/IPConstantPropagation.cpp
@@ -186,7 +186,7 @@ bool IPCP::PropagateConstantReturn(Function &F) {
         // Find the returned value
         Value *V;
         if (!STy)
-          V = RI->getOperand(i);
+          V = RI->getOperand(0);
         else
           V = FindInsertedValue(RI->getOperand(0), i);
 
diff --git a/lib/VMCore/Verifier.cpp b/lib/VMCore/Verifier.cpp
index 58ec6fe88d3..1143151b01d 100644
--- a/lib/VMCore/Verifier.cpp
+++ b/lib/VMCore/Verifier.cpp
@@ -826,30 +826,10 @@ void Verifier::visitReturnInst(ReturnInst &RI) {
     Assert2(N == 0,
             "Found return instr that returns non-void in Function of void "
             "return type!", &RI, F->getReturnType());
-  else if (N == 1 && F->getReturnType() == RI.getOperand(0)->getType()) {
-    // Exactly one return value and it matches the return type. Good.
-  } else if (const StructType *STy = dyn_cast<StructType>(F->getReturnType())) {
-    // The return type is a struct; check for multiple return values.
-    Assert2(STy->getNumElements() == N,
-            "Incorrect number of return values in ret instruction!",
-            &RI, F->getReturnType());
-    for (unsigned i = 0; i != N; ++i)
-      Assert2(STy->getElementType(i) == RI.getOperand(i)->getType(),
-              "Function return type does not match operand "
-              "type of return inst!", &RI, F->getReturnType());
-  } else if (const ArrayType *ATy = dyn_cast<ArrayType>(F->getReturnType())) {
-    // The return type is an array; check for multiple return values.
-    Assert2(ATy->getNumElements() == N,
-            "Incorrect number of return values in ret instruction!",
-            &RI, F->getReturnType());
-    for (unsigned i = 0; i != N; ++i)
-      Assert2(ATy->getElementType() == RI.getOperand(i)->getType(),
-              "Function return type does not match operand "
-              "type of return inst!", &RI, F->getReturnType());
-  } else {
-    CheckFailed("Function return type does not match operand "
-                "type of return inst!", &RI, F->getReturnType());
-  }
+  else
+    Assert2(N == 1 && F->getReturnType() == RI.getOperand(0)->getType(),
+            "Function return type does not match operand "
+            "type of return inst!", &RI, F->getReturnType());
 
   // Check to make sure that the return value has necessary properties for
   // terminators...
diff --git a/test/Assembler/aggregate-return-single-value.ll b/test/Assembler/aggregate-return-single-value.ll
index 02fb59f8a0a..04540b54af1 100644
--- a/test/Assembler/aggregate-return-single-value.ll
+++ b/test/Assembler/aggregate-return-single-value.ll
@@ -1,14 +1,8 @@
 ; RUN: llvm-as < %s | llvm-dis
 
-define { i32 } @fooa() nounwind {
-  ret i32 0
-}
 define { i32 } @foob() nounwind {
   ret {i32}{ i32 0 }
 }
-define [1 x i32] @fooc() nounwind {
-  ret i32 0
-}
 define [1 x i32] @food() nounwind {
   ret [1 x i32][ i32 0 ]
 }
-- 
2.34.1