R600/SI: Expand misaligned 16-bit memory accesses

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228190 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/R600/SIISelLowering.cpp b/lib/Target/R600/SIISelLowering.cpp
index 4545a5c648ccf317e229a957e632084b7b273bff..aeb3d131fb529f2c3d09862bddb53085b1b64727 100644 (file)
--- a/lib/Target/R600/SIISelLowering.cpp
+++ b/lib/Target/R600/SIISelLowering.cpp
@@ -324,6 +324,11 @@ bool SITargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
     return Align % 4 == 0;
   }
 
+  // Smaller than dword value must be aligned.
+  // FIXME: This should be allowed on CI+
+  if (VT.bitsLT(MVT::i32))
+    return false;
+
   // 8.1.6 - For Dword or larger reads or writes, the two LSBs of the
   // byte-address are ignored, thus forcing Dword alignment.
   // This applies to private, global, and constant memory.

diff --git a/test/CodeGen/R600/unaligned-load-store.ll b/test/CodeGen/R600/unaligned-load-store.ll
index 8ed0838c4ac68073d78fff9e06658a026c1dbeb9..665dc37c200aafcbca2ceef73af8fbe4fdfbbb24 100644 (file)
--- a/test/CodeGen/R600/unaligned-load-store.ll
+++ b/test/CodeGen/R600/unaligned-load-store.ll
@@ -1,6 +1,30 @@
 ; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs< %s | FileCheck -check-prefix=SI %s
 ; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs< %s | FileCheck -check-prefix=SI %s
 
+; SI-LABEL: {{^}}unaligned_load_store_i16_local:
+; SI: ds_read_u8
+; SI: ds_read_u8
+; SI: ds_write_b8
+; SI: ds_write_b8
+; SI: s_endpgm
+define void @unaligned_load_store_i16_local(i16 addrspace(3)* %p, i16 addrspace(3)* %r) nounwind {
+  %v = load i16 addrspace(3)* %p, align 1
+  store i16 %v, i16 addrspace(3)* %r, align 1
+  ret void
+}
+
+; SI-LABEL: {{^}}unaligned_load_store_i16_global:
+; SI: buffer_load_ubyte
+; SI: buffer_load_ubyte
+; SI: buffer_store_byte
+; SI: buffer_store_byte
+; SI: s_endpgm
+define void @unaligned_load_store_i16_global(i16 addrspace(1)* %p, i16 addrspace(1)* %r) nounwind {
+  %v = load i16 addrspace(1)* %p, align 1
+  store i16 %v, i16 addrspace(1)* %r, align 1
+  ret void
+}
+
 ; SI-LABEL: {{^}}unaligned_load_store_i32_local:
 ; SI: ds_read_u8
 ; SI: ds_read_u8