From 32155acb8af11fbe21553ef4056c555dcc4a0b99 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Tue, 19 Aug 2008 20:43:22 +0000
Subject: [PATCH] Handle the case where target-specific fastisel code doesn't
 have a desired opcode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55005 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/FastISel.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index f4d453966b8..62fac06ceb8 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -33,6 +33,11 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin, BasicBlock::iterator En
         return I;
       }
       unsigned ResultReg = FastEmit_rr(VT.getSimpleVT(), ISD::ADD, Op0, Op1);
+      if (ResultReg == 0) {
+        // Target-specific code wasn't able to find a machine opcode for
+        // the given ISD opcode and type. Halt "fast" selection and bail.
+        return I;
+      }
       ValueMap[I] = ResultReg;
       break;
     }