[RISCV] Fix 64-bit data layout mismatch between backend and target description

Reviewers: asb

Reviewed By: asb

Subscribers: rbar, johnrusso, simoncook, jordy.potman.lists, llvm-commits

Differential Revision: https://reviews.llvm.org/D40145

llvm-svn: 318454

llvm/lib/Target/RISCV/RISCVTargetMachine.cpp

@@ -30,7 +30,7 @@ extern "C" void LLVMInitializeRISCVTarget() {
 
 static std::string computeDataLayout(const Triple &TT) {
   if (TT.isArch64Bit()) {
-    return "e-m:e-i64:64-n32:64-S128";
+    return "e-m:e-p:64:64-i64:64-i128:128-n64-S128";
   } else {
     assert(TT.isArch32Bit() && "only RV32 and RV64 are currently supported");
     return "e-m:e-p:32:32-i64:64-n32-S128";