[PATCH] R600: Fix segfault in R600TextureIntrinsicReplacer

[Tom Stellard]

From: Tom Stellard <thomas.stellard at amd.com>

This pass was segfaulting when it ran into a non-intrinsic function
call.  Function calls are not supported, so now instead of segfaulting,
we will get an assertion failure with a nice error message.

I'm not sure how to test this using lit.
---
 lib/Target/R600/R600TextureIntrinsicsReplacer.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Target/R600/R600TextureIntrinsicsReplacer.cpp b/lib/Target/R600/R600TextureIntrinsicsReplacer.cpp
index 37d9059..d4b8ec0 100644
--- a/lib/Target/R600/R600TextureIntrinsicsReplacer.cpp
+++ b/lib/Target/R600/R600TextureIntrinsicsReplacer.cpp
@@ -260,6 +260,9 @@ public:
   }
 
   void visitCallInst(CallInst &I) {
+    if (!I.getCalledFunction()) {
+      return;
+    }
     StringRef Name = I.getCalledFunction()->getName();
     if (Name == "llvm.AMDGPU.tex") {
       ReplaceTexIntrinsic(I, false, TexSign, "llvm.R600.tex", "llvm.R600.texc");
-- 
1.7.11.4