Add R600 backend

A new backend supporting AMD GPUs: Radeon HD2XXX - HD7XXX

llvm-svn: 169915
diff --git a/llvm/test/CodeGen/R600/fcmp-cnde-int-args.ll b/llvm/test/CodeGen/R600/fcmp-cnde-int-args.ll
new file mode 100644
index 0000000..5c981ef
--- /dev/null
+++ b/llvm/test/CodeGen/R600/fcmp-cnde-int-args.ll
@@ -0,0 +1,16 @@
+;RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s
+
+; This test checks a bug in R600TargetLowering::LowerSELECT_CC where the
+; chance to optimize the fcmp + select instructions to CNDE was missed
+; due to the fact that the operands to fcmp and select had different types
+
+;CHECK: CNDE T{{[0-9]+\.[XYZW], T[0-9]+\.[XYZW], literal.x, 0.0, -1}}
+
+define void @test(i32 addrspace(1)* %out, float addrspace(1)* %in) {
+entry:
+  %0 = load float addrspace(1)* %in
+  %cmp = fcmp oeq float %0, 0.000000e+00
+  %value = select i1 %cmp, i32 -1, i32 0
+  store i32 %value, i32 addrspace(1)* %out
+  ret void
+}