Reapply bottom-up fast-isel, with several fixes for x86-32:

 - Check getBytesToPopOnReturn().
 - Eschew ST0 and ST1 for return values.
 - Fix the PIC base register initialization so that it doesn't ever
   fail to end up the top of the entry block.

llvm-svn: 108039

1 files changed, 4 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/CallingConvLower.cpp b/llvm/lib/CodeGen/CallingConvLower.cpp
index 5e47038054f..62ad8171a9d 100644
--- a/llvm/lib/CodeGen/CallingConvLower.cpp
+++ b/llvm/lib/CodeGen/CallingConvLower.cpp
@@ -80,13 +80,12 @@ CCState::AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
 
 /// CheckReturn - Analyze the return values of a function, returning true if
 /// the return can be performed without sret-demotion, and false otherwise.
-bool CCState::CheckReturn(const SmallVectorImpl<EVT> &OutTys,
-                          const SmallVectorImpl<ISD::ArgFlagsTy> &ArgsFlags,
+bool CCState::CheckReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
                           CCAssignFn Fn) {
   // Determine which register each value should be copied into.
-  for (unsigned i = 0, e = OutTys.size(); i != e; ++i) {
-    EVT VT = OutTys[i];
-    ISD::ArgFlagsTy ArgFlags = ArgsFlags[i];
+  for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
+    EVT VT = Outs[i].VT;
+    ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
     if (Fn(i, VT, VT, CCValAssign::Full, ArgFlags, *this))
       return false;
   }