X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=lib%2FCodeGen%2FSelectionDAG%2FSelectionDAG.cpp;h=abbc48e10e46eb2eb29f855af0e493c542da9888;hp=4596b8eba1a0d946980a73fdc2d838c164562c46;hb=f3296cdf519636bde7e4c6fbb77f10f4e3875c19;hpb=59ef72d321d2c3322c95f26f365b39c07b60d99a

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 4596b8eba1a..abbc48e10e4 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4557,6 +4557,16 @@ static SDValue getMemsetStores(SelectionDAG &DAG, SDLoc dl,
   return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains);
 }
 
+static void checkAddrSpaceIsValidForLibcall(const TargetLowering *TLI,
+                                            unsigned AS) {
+  // Lowering memcpy / memset / memmove intrinsics to calls is only valid if all
+  // pointer operands can be losslessly bitcasted to pointers of address space 0
+  if (AS != 0 && !TLI->isNoopAddrSpaceCast(AS, 0)) {
+    report_fatal_error("cannot lower memory intrinsic in address space " +
+                       Twine(AS));
+  }
+}
+
 SDValue SelectionDAG::getMemcpy(SDValue Chain, SDLoc dl, SDValue Dst,
                                 SDValue Src, SDValue Size,
                                 unsigned Align, bool isVol, bool AlwaysInline,
@@ -4598,6 +4608,9 @@ SDValue SelectionDAG::getMemcpy(SDValue Chain, SDLoc dl, SDValue Dst,
                                    true, DstPtrInfo, SrcPtrInfo);
   }
 
+  checkAddrSpaceIsValidForLibcall(TLI, DstPtrInfo.getAddrSpace());
+  checkAddrSpaceIsValidForLibcall(TLI, SrcPtrInfo.getAddrSpace());
+
   // FIXME: If the memcpy is volatile (isVol), lowering it to a plain libc
   // memcpy is not guaranteed to be safe. libc memcpys aren't required to
   // respect volatile, so they may do things like read or write memory
@@ -4659,6 +4672,9 @@ SDValue SelectionDAG::getMemmove(SDValue Chain, SDLoc dl, SDValue Dst,
       return Result;
   }
 
+  checkAddrSpaceIsValidForLibcall(TLI, DstPtrInfo.getAddrSpace());
+  checkAddrSpaceIsValidForLibcall(TLI, SrcPtrInfo.getAddrSpace());
+
   // FIXME: If the memmove is volatile, lowering it to plain libc memmove may
   // not be safe.  See memcpy above for more details.
 
@@ -4716,6 +4732,8 @@ SDValue SelectionDAG::getMemset(SDValue Chain, SDLoc dl, SDValue Dst,
       return Result;
   }
 
+  checkAddrSpaceIsValidForLibcall(TLI, DstPtrInfo.getAddrSpace());
+
   // Emit a library call.
   Type *IntPtrTy = getDataLayout().getIntPtrType(*getContext());
   TargetLowering::ArgListTy Args;