[RuntimeDebugBuilder] Do not break for 64 bit integers

In r330292 this assert was turned incorrectly into an unreachable, but
the correct behavior (thanks Michael) is to assert for anything that is
not 64 bit, but falltrough for 64 bit. I document this in the source
code.

llvm-svn: 330309

1 files changed, 6 insertions, 3 deletions

diff --git a/polly/lib/CodeGen/RuntimeDebugBuilder.cpp b/polly/lib/CodeGen/RuntimeDebugBuilder.cpp
index e127673a48d..6c54f137ce7 100644
--- a/polly/lib/CodeGen/RuntimeDebugBuilder.cpp
+++ b/polly/lib/CodeGen/RuntimeDebugBuilder.cpp
@@ -188,10 +188,13 @@ void RuntimeDebugBuilder::createGPUPrinterT(PollyIRBuilder &Builder,
       if (!Ty->isDoubleTy())
         Val = Builder.CreateFPExt(Val, Builder.getDoubleTy());
     } else if (Ty->isIntegerTy()) {
-      if (Ty->getIntegerBitWidth() < 64)
+      if (Ty->getIntegerBitWidth() < 64) {
         Val = Builder.CreateSExt(Val, Builder.getInt64Ty());
-      else
-        llvm_unreachable("Integer types larger 64 bit not supported");
+      } else {
+        assert(Ty->getIntegerBitWidth() == 64 &&
+               "Integer types larger 64 bit not supported");
+        // fallthrough
+      }
     } else if (auto PtTy = dyn_cast<PointerType>(Ty)) {
       if (PtTy->getAddressSpace() == 4) {
         // Pointers in constant address space are printed as strings