reapply r101434

with a fix for self-hosting

rotate CallInst operands, i.e. move callee to the back
of the operand array

the motivation for this patch are laid out in my mail to llvm-commits:
more efficient access to operands and callee, faster callgraph-construction,
smaller compiler binary


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101465 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 10 deletions

diff --git a/lib/Target/CppBackend/CPPBackend.cpp b/lib/Target/CppBackend/CPPBackend.cpp
index 51d9d75fce..a4af3914f9 100644
--- a/lib/Target/CppBackend/CPPBackend.cpp
+++ b/lib/Target/CppBackend/CPPBackend.cpp
@@ -1082,8 +1082,9 @@ namespace {
 
     // Before we emit this instruction, we need to take care of generating any
     // forward references. So, we get the names of all the operands in advance
-    std::string* opNames = new std::string[I->getNumOperands()];
-    for (unsigned i = 0; i < I->getNumOperands(); i++) {
+    const unsigned Ops(I->getNumOperands());
+    std::string* opNames = new std::string[Ops];
+    for (unsigned i = 0; i < Ops; i++) {
       opNames[i] = getOpName(I->getOperand(i));
     }
 
@@ -1144,15 +1145,15 @@ namespace {
       const InvokeInst* inv = cast<InvokeInst>(I);
       Out << "std::vector<Value*> " << iName << "_params;";
       nl(Out);
-      for (unsigned i = 3; i < inv->getNumOperands(); ++i) {
+      for (unsigned i = 0; i < inv->getNumOperands() - 3; ++i) {
         Out << iName << "_params.push_back("
             << opNames[i] << ");";
         nl(Out);
       }
       Out << "InvokeInst *" << iName << " = InvokeInst::Create("
-          << opNames[0] << ", "
-          << opNames[1] << ", "
-          << opNames[2] << ", "
+          << opNames[Ops - 3] << ", "
+          << opNames[Ops - 2] << ", "
+          << opNames[Ops - 1] << ", "
           << iName << "_params.begin(), " << iName << "_params.end(), \"";
       printEscapedString(inv->getName());
       Out << "\", " << bbname << ");";
@@ -1388,18 +1389,18 @@ namespace {
       if (call->getNumOperands() > 2) {
         Out << "std::vector<Value*> " << iName << "_params;";
         nl(Out);
-        for (unsigned i = 1; i < call->getNumOperands(); ++i) {
+        for (unsigned i = 0; i < call->getNumOperands() - 1; ++i) {
           Out << iName << "_params.push_back(" << opNames[i] << ");";
           nl(Out);
         }
         Out << "CallInst* " << iName << " = CallInst::Create("
-            << opNames[0] << ", " << iName << "_params.begin(), "
+            << opNames[Ops - 1] << ", " << iName << "_params.begin(), "
             << iName << "_params.end(), \"";
       } else if (call->getNumOperands() == 2) {
         Out << "CallInst* " << iName << " = CallInst::Create("
-            << opNames[0] << ", " << opNames[1] << ", \"";
+            << opNames[Ops - 1] << ", " << opNames[0] << ", \"";
       } else {
-        Out << "CallInst* " << iName << " = CallInst::Create(" << opNames[0]
+        Out << "CallInst* " << iName << " = CallInst::Create(" << opNames[Ops - 1]
             << ", \"";
       }
       printEscapedString(call->getName());