vendor/llvm/llvm-release_39-r276489

1 files changed, 21 insertions, 0 deletions

diff --git a/test/CodeGen/AMDGPU/gv-offset-folding.ll b/test/CodeGen/AMDGPU/gv-offset-folding.ll
new file mode 100644
index 000000000000..c75fdb35dd0e
--- /dev/null
+++ b/test/CodeGen/AMDGPU/gv-offset-folding.ll
@@ -0,0 +1,21 @@
+; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=fiji -relocation-model=static < %s | FileCheck %s
+
+@lds = external addrspace(3) global [4 x i32]
+
+; Function Attrs: nounwind
+
+; Offset folding is an optimization done for global variables with relocations,
+; which allows you to store the offset in the r_addend of the relocation entry.
+; The offset is apllied to the variables address at link time, which eliminates
+; the need to emit shader instructions to do this calculation.
+; We don't use relocations for local memory, so we should never fold offsets
+; for local memory globals.
+
+; CHECK-LABEL: lds_no_offset:
+; CHECK ds_write_b32 v{{[0-9]+}}, v{{[0-9]+}} offset:4
+define void @lds_no_offset() {
+entry:
+  %ptr = getelementptr [4 x i32], [4 x i32] addrspace(3)* @lds, i32 0, i32 1
+  store i32 0, i32 addrspace(3)* %ptr
+  ret void
+}