For PR1099:

Partial fix for this PR. Default function parameters to signed integer, just
like everything else in CBE. The bug was caused by incorrectly introducing
parameter attributes feature by choosing "signed" parameter if the
SExtAttribute was specified. Howeer, if no attribute is specified, this
causes it to become unsigned which is incorrect. Reversing the logic so
that signedness is detected by "not ZExtAttribute" set fixes the issue.

This fixes 197.parser but there is more to do. Any comparison and possibly
other operators involving arguments may need to correctly cast the parameter
before its use, depending on the sign of the operator.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33034 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 8 deletions

diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index ff87be7758..8156e88d67 100644
--- a/lib/Target/CBackend/Writer.cpp
+++ b/lib/Target/CBackend/Writer.cpp
@@ -348,7 +348,7 @@ void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
     if (PrintedType)
       FunctionInnards << ", ";
     printType(FunctionInnards, *I, 
-        /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
+        /*isSigned=*/!FTy->paramHasAttr(Idx, FunctionType::ZExtAttribute), "");
     PrintedType = true;
   }
   if (FTy->isVarArg()) {
@@ -360,7 +360,7 @@ void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
   FunctionInnards << ')';
   std::string tstr = FunctionInnards.str();
   printType(Out, RetTy, 
-      /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
+      /*isSigned=*/!FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
 }
 
 std::ostream &
@@ -417,7 +417,7 @@ std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
       if (I != FTy->param_begin())
         FunctionInnards << ", ";
       printType(FunctionInnards, *I, 
-          /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
+         /*isSigned=*/!FTy->paramHasAttr(Idx, FunctionType::ZExtAttribute), "");
       ++Idx;
     }
     if (FTy->isVarArg()) {
@@ -429,7 +429,7 @@ std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
     FunctionInnards << ')';
     std::string tstr = FunctionInnards.str();
     printType(Out, FTy->getReturnType(), 
-        /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
+        /*isSigned=*/!FTy->paramHasAttr(0, FunctionType::ZExtAttribute), tstr);
     return Out;
   }
   case Type::StructTyID: {
@@ -1775,7 +1775,7 @@ void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
         else
           ArgName = "";
         printType(FunctionInnards, I->getType(), 
-            /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute), 
+            /*isSigned=*/!FT->paramHasAttr(Idx, FunctionType::ZExtAttribute), 
             ArgName);
         PrintedArg = true;
         ++Idx;
@@ -1796,7 +1796,7 @@ void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
     for (; I != E; ++I) {
       if (PrintedArg) FunctionInnards << ", ";
       printType(FunctionInnards, *I,
-               /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute));
+             /*isSigned=*/!FT->paramHasAttr(Idx, FunctionType::ZExtAttribute));
       PrintedArg = true;
       ++Idx;
     }
@@ -1823,7 +1823,8 @@ void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
   }
     
   // Print out the return type and the signature built above.
-  printType(Out, RetTy, FT->paramHasAttr(0, FunctionType::SExtAttribute),
+  printType(Out, RetTy, 
+            /*isSigned=*/!FT->paramHasAttr(0, FunctionType::ZExtAttribute), 
             FunctionInnards.str());
 }
 
@@ -2516,7 +2517,7 @@ void CWriter::visitCallInst(CallInst &I) {
         (*AI)->getType() != FTy->getParamType(ArgNo)) {
       Out << '(';
       printType(Out, FTy->getParamType(ArgNo), 
-              /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute));
+            /*isSigned=*/!FTy->paramHasAttr(Idx, FunctionType::ZExtAttribute));
       Out << ')';
     }
     writeOperand(*AI);