fold compare of null pointer into compare with 0.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57553 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 954a3a0..e04e91a 100644
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -549,6 +549,10 @@
unsigned Op0Reg = getRegForValue(Op0);
if (Op0Reg == 0) return false;
+ // Handle 'null' like i32/i64 0.
+ if (isa<ConstantPointerNull>(Op1))
+ Op1 = Constant::getNullValue(TD.getIntPtrType());
+
// We have two options: compare with register or immediate. If the RHS of
// the compare is an immediate that we can fold into this compare, use
// CMPri, otherwise use CMPrr.