R600/SI: Only use SALU instructions for 64-bit add in a block of CF depth 0

llvm-svn: 208886

1 files changed, 25 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/R600/add.ll b/llvm/test/CodeGen/R600/add.ll
index e9db52ae4ae..711a2bc4177 100644
--- a/llvm/test/CodeGen/R600/add.ll
+++ b/llvm/test/CodeGen/R600/add.ll
@@ -140,3 +140,28 @@ entry:
   store i64 %1, i64 addrspace(1)* %out
   ret void
 }
+
+; Test i64 add inside a branch.  We don't allow SALU instructions inside of
+; branches.
+; FIXME: We are being conservative here.  We could allow this in some cases.
+; FUNC-LABEL: @add64_in_branch
+; SI-CHECK-NOT: S_ADD_I32
+; SI-CHECK-NOT: S_ADDC_U32
+define void @add64_in_branch(i64 addrspace(1)* %out, i64 addrspace(1)* %in, i64 %a, i64 %b, i64 %c) {
+entry:
+  %0 = icmp eq i64 %a, 0
+  br i1 %0, label %if, label %else
+
+if:
+  %1 = load i64 addrspace(1)* %in
+  br label %endif
+
+else:
+  %2 = add i64 %a, %b
+  br label %endif
+
+endif:
+  %3 = phi i64 [%1, %if], [%2, %else]
+  store i64 %3, i64 addrspace(1)* %out
+  ret void
+}