Add R600 backend

A new backend supporting AMD GPUs: Radeon HD2XXX - HD7XXX

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169915 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/R600/selectcc-icmp-select-float.ll

@@ -0,0 +1,15 @@
+; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s
+
+; Note additional optimizations may cause this SGT to be replaced with a
+; CND* instruction.
+; CHECK: SGT_INT T{{[0-9]+\.[XYZW], T[0-9]+\.[XYZW], literal.x, -1}}
+; Test a selectcc with i32 LHS/RHS and float True/False
+
+define void @test(float addrspace(1)* %out, i32 addrspace(1)* %in) {
+entry:
+  %0 = load i32 addrspace(1)* %in
+  %1 = icmp sge i32 %0, 0
+  %2 = select i1 %1, float 1.0, float 0.0
+  store float %2, float addrspace(1)* %out
+  ret void
+}