Sign extend, rather than zero extend, narrow gep indices

For example, clang creates these for ++ and -- operations on pointers
on 64-bit platforms.

git-svn-id: https://llvm.org/svn/llvm-project/klee/trunk@136474 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/Core/Context.cpp b/lib/Core/Context.cpp
index 45dbdca0..979970aa 100644
--- a/lib/Core/Context.cpp
+++ b/lib/Core/Context.cpp
@@ -35,7 +35,11 @@ const Context &Context::get() {
 // FIXME: This is a total hack, just to avoid a layering issue until this stuff
 // moves out of Expr.
 
-ref<Expr> Expr::createCoerceToPointerType(ref<Expr> e) {
+ref<Expr> Expr::createSExtToPointerWidth(ref<Expr> e) {
+  return SExtExpr::create(e, Context::get().getPointerWidth());
+}
+
+ref<Expr> Expr::createZExtToPointerWidth(ref<Expr> e) {
   return ZExtExpr::create(e, Context::get().getPointerWidth());
 }