AMDGPU/SI: Fix crash when inline assembly is used in a graphics shader

Summary:
This is admittedly something that you could only run into by manually
playing around with shader assembly because the SITypeWriter pass is
skipped for compute.

Reviewers: arsenm, tstellarAMD

Subscribers: arsenm, llvm-commits

Differential Revision: http://reviews.llvm.org/D15902

llvm-svn: 256980

2 files changed, 14 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/SITypeRewriter.cpp b/llvm/lib/Target/AMDGPU/SITypeRewriter.cpp
index dbdc76b917f..d36c5d29b12 100644
--- a/llvm/lib/Target/AMDGPU/SITypeRewriter.cpp
+++ b/llvm/lib/Target/AMDGPU/SITypeRewriter.cpp
@@ -98,6 +98,9 @@ void SITypeRewriter::visitCallInst(CallInst &I) {
   SmallVector <Type*, 8> Types;
   bool NeedToReplace = false;
   Function *F = I.getCalledFunction();
+  if (!F)
+    return;
+
   std::string Name = F->getName();
   for (unsigned i = 0, e = I.getNumArgOperands(); i != e; ++i) {
     Value *Arg = I.getArgOperand(i);
diff --git a/llvm/test/CodeGen/AMDGPU/inline-asm.ll b/llvm/test/CodeGen/AMDGPU/inline-asm.ll
index efc2292de3a..9c8d3534f8a 100644
--- a/llvm/test/CodeGen/AMDGPU/inline-asm.ll
+++ b/llvm/test/CodeGen/AMDGPU/inline-asm.ll
@@ -10,3 +10,14 @@ entry:
   call void asm sideeffect "s_endpgm", ""()
   ret void
 }
+
+; CHECK: {{^}}inline_asm_shader:
+; CHECK: s_endpgm
+; CHECK: s_endpgm
+define void @inline_asm_shader() #0 {
+entry:
+  call void asm sideeffect "s_endpgm", ""()
+  ret void
+}
+
+attributes #0 = { "ShaderType"="0" }