AMDGPU: Fix converting unanalyzable global loads to SMRD
Not all memory dependence queries succeed, so this needs to
be conservative if it fails.
llvm-svn: 307861
diff --git a/llvm/test/CodeGen/AMDGPU/global-smrd-unknown.ll b/llvm/test/CodeGen/AMDGPU/global-smrd-unknown.ll
new file mode 100644
index 0000000..8a576e6
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/global-smrd-unknown.ll
@@ -0,0 +1,20 @@
+; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=fiji -memdep-block-scan-limit=1 -amdgpu-scalarize-global-loads -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=GCN %s
+
+; GCN-LABEL: {{^}}unknown_memdep_analysis:
+; GCN: flat_load_dword
+; GCN: flat_load_dword
+; GCN: flat_store_dword
+define amdgpu_kernel void @unknown_memdep_analysis(float addrspace(1)* nocapture readonly %arg) #0 {
+bb:
+ %tmp53 = load float, float addrspace(1)* undef, align 4
+ %tmp54 = getelementptr inbounds float, float addrspace(1)* %arg, i32 31
+ %tmp55 = load float, float addrspace(1)* %tmp54, align 4
+ %tmp56 = tail call float @llvm.fmuladd.f32(float undef, float %tmp53, float %tmp55)
+ store float %tmp56, float addrspace(1)* undef, align 4
+ ret void
+}
+
+declare float @llvm.fmuladd.f32(float, float, float) #1
+
+attributes #0 = { nounwind }
+attributes #1 = { nounwind readnone speculatable }