AMDGPU: Ignore subtarget for InferAddressSpaces

Even if the target doesn't have flat instructions, addrspace(0) is
still flat. It just happens to not work.

llvm-svn: 363561

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InferAddressSpaces/AMDGPU/no-flat-addrspace.ll b/llvm/test/Transforms/InferAddressSpaces/AMDGPU/no-flat-addrspace.ll
new file mode 100644
index 00000000000..8e04d3cf13b
--- /dev/null
+++ b/llvm/test/Transforms/InferAddressSpaces/AMDGPU/no-flat-addrspace.ll
@@ -0,0 +1,13 @@
+; RUN: opt -S -mtriple=amdgcn-mesa-mesa3d -mcpu=tahiti -infer-address-spaces %s | FileCheck %s
+
+; Make sure addrspace(0) is still treated as flat on targets without
+; flat instructions. It's still flat, it just doesn't work.
+
+; CHECK-LABEL: @load_flat_from_global(
+; CHECK-NEXT: %tmp1 = load float, float addrspace(1)* %ptr
+; CHECK-NEXT: ret float %tmp1
+define float @load_flat_from_global(float addrspace(1)*%ptr) #0 {
+  %tmp0 = addrspacecast float addrspace(1)* %ptr to float*
+  %tmp1 = load float, float* %tmp0
+  ret float %tmp1
+}