R600: Add support for i8 and i16 local memory loads

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189225 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/R600/AMDGPUInstructions.td

@@ -96,6 +96,10 @@ def az_extloadi8 : PatFrag<(ops node:$ptr), (az_extload node:$ptr), [{
   return cast<LoadSDNode>(N)->getMemoryVT() == MVT::i8;
 }]>;
 
+def az_extloadi8_global : PatFrag<(ops node:$ptr), (az_extloadi8 node:$ptr), [{
+    return isGlobalLoad(dyn_cast<LoadSDNode>(N));
+}]>;
+
 def sextloadi8_global : PatFrag<(ops node:$ptr), (sextloadi8 node:$ptr), [{
     return isGlobalLoad(dyn_cast<LoadSDNode>(N));
 }]>;
@@ -108,8 +112,12 @@ def sextloadi8_constant : PatFrag<(ops node:$ptr), (sextloadi8 node:$ptr), [{
     return isConstantLoad(dyn_cast<LoadSDNode>(N), -1);
 }]>;
 
-def az_extloadi8_global : PatFrag<(ops node:$ptr), (az_extloadi8 node:$ptr), [{
+def az_extloadi8_local : PatFrag<(ops node:$ptr), (az_extloadi8 node:$ptr), [{
-    return isGlobalLoad(dyn_cast<LoadSDNode>(N));
+    return isLocalLoad(dyn_cast<LoadSDNode>(N));
+}]>;
+
+def sextloadi8_local : PatFrag<(ops node:$ptr), (sextloadi8 node:$ptr), [{
+    return isLocalLoad(dyn_cast<LoadSDNode>(N));
 }]>;
 
 def az_extloadi16 : PatFrag<(ops node:$ptr), (az_extload node:$ptr), [{
@@ -132,6 +140,14 @@ def sextloadi16_constant : PatFrag<(ops node:$ptr), (sextloadi16 node:$ptr), [{
     return isConstantLoad(dyn_cast<LoadSDNode>(N), -1);
 }]>;
 
+def az_extloadi16_local : PatFrag<(ops node:$ptr), (az_extloadi16 node:$ptr), [{
+    return isLocalLoad(dyn_cast<LoadSDNode>(N));
+}]>;
+
+def sextloadi16_local : PatFrag<(ops node:$ptr), (sextloadi16 node:$ptr), [{
+    return isLocalLoad(dyn_cast<LoadSDNode>(N));
+}]>;
+
 def az_extloadi32 : PatFrag<(ops node:$ptr), (az_extload node:$ptr), [{
   return cast<LoadSDNode>(N)->getMemoryVT() == MVT::i32;
 }]>;

lib/Target/R600/R600ISelLowering.cpp

@@ -104,7 +104,21 @@ MachineBasicBlock * R600TargetLowering::EmitInstrWithCustomInserter(
     static_cast<const R600InstrInfo*>(MF->getTarget().getInstrInfo());
 
   switch (MI->getOpcode()) {
-  default: return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
+  default:
+    if (TII->get(MI->getOpcode()).TSFlags & R600_InstFlag::LDS_1A) {
+      MachineInstrBuilder NewMI = BuildMI(*BB, I, BB->findDebugLoc(I),
+                                          TII->get(MI->getOpcode()),
+                                          AMDGPU::OQAP);
+      for (unsigned i = 1, e = MI->getNumOperands(); i < e; ++i) {
+        NewMI.addOperand(MI->getOperand(i));
+      }
+      TII->buildDefaultInstruction(*BB, I, AMDGPU::MOV,
+                                   MI->getOperand(0).getReg(),
+                                   AMDGPU::OQAP);
+    } else {
+      return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
+    }
+    break;
   case AMDGPU::CLAMP_R600: {
     MachineInstr *NewMI = TII->buildDefaultInstruction(*BB, I,
                                                    AMDGPU::MOV,
@@ -140,19 +154,6 @@ MachineBasicBlock * R600TargetLowering::EmitInstrWithCustomInserter(
     break;
   }
 
-  case AMDGPU::LDS_READ_RET: {
-    MachineInstrBuilder NewMI = BuildMI(*BB, I, BB->findDebugLoc(I),
-                                        TII->get(MI->getOpcode()),
-                                        AMDGPU::OQAP);
-    for (unsigned i = 1, e = MI->getNumOperands(); i < e; ++i) {
-      NewMI.addOperand(MI->getOperand(i));
-    }
-    TII->buildDefaultInstruction(*BB, I, AMDGPU::MOV,
-                                 MI->getOperand(0).getReg(),
-                                 AMDGPU::OQAP);
-    break;
-  }
-
   case AMDGPU::MOV_IMM_F32:
     TII->buildMovImm(*BB, I, MI->getOperand(0).getReg(),
                      MI->getOperand(1).getFPImm()->getValueAPF()

lib/Target/R600/R600Instructions.td

@@ -1682,6 +1682,18 @@ def LDS_SHORT_WRITE : R600_LDS_1A1D<0x13, "LDS_SHORT_WRITE",
 def LDS_READ_RET : R600_LDS_1A <0x32, "LDS_READ_RET",
   [(set (i32 R600_Reg32:$dst), (local_load R600_Reg32:$src0))]
 >;
+def LDS_BYTE_READ_RET : R600_LDS_1A <0x36, "LDS_BYTE_READ_RET",
+  [(set i32:$dst, (sextloadi8_local i32:$src0))]
+>;
+def LDS_UBYTE_READ_RET : R600_LDS_1A <0x37, "LDS_UBYTE_READ_RET",
+  [(set i32:$dst, (az_extloadi8_local i32:$src0))]
+>;
+def LDS_SHORT_READ_RET : R600_LDS_1A <0x38, "LDS_SHORT_READ_RET",
+  [(set i32:$dst, (sextloadi16_local i32:$src0))]
+>;
+def LDS_USHORT_READ_RET : R600_LDS_1A <0x39, "LDS_USHORT_READ_RET",
+  [(set i32:$dst, (az_extloadi16_local i32:$src0))]
+>;
 
   // TRUNC is used for the FLT_TO_INT instructions to work around a
   // perceived problem where the rounding modes are applied differently

lib/Target/R600/SIInstructions.td

@@ -395,6 +395,10 @@ def DS_WRITE_B32 : DS_Store_Helper <0x0000000d, "DS_WRITE_B32", VReg_32>;
 def DS_WRITE_B8 : DS_Store_Helper <0x00000001e, "DS_WRITE_B8", VReg_32>;
 def DS_WRITE_B16 : DS_Store_Helper <0x00000001f, "DS_WRITE_B16", VReg_32>;
 def DS_READ_B32 : DS_Load_Helper <0x00000036, "DS_READ_B32", VReg_32>;
+def DS_READ_I8 : DS_Load_Helper <0x00000039, "DS_READ_I8", VReg_32>;
+def DS_READ_U8 : DS_Load_Helper <0x0000003a, "DS_READ_U8", VReg_32>;
+def DS_READ_I16 : DS_Load_Helper <0x0000003b, "DS_READ_I16", VReg_32>;
+def DS_READ_U16 : DS_Load_Helper <0x0000003c, "DS_READ_U16", VReg_32>;
 
 //def BUFFER_LOAD_FORMAT_X : MUBUF_ <0x00000000, "BUFFER_LOAD_FORMAT_X", []>;
 //def BUFFER_LOAD_FORMAT_XY : MUBUF_ <0x00000001, "BUFFER_LOAD_FORMAT_XY", []>;
@@ -1747,6 +1751,16 @@ def : Pat <
 /**********   Load/Store Patterns   **********/
 /********** ======================= **********/
 
+class DSReadPat <DS inst, ValueType vt, PatFrag frag> : Pat <
+  (frag i32:$src0),
+  (vt (inst 0, $src0, $src0, $src0, 0, 0))
+>;
+
+def : DSReadPat <DS_READ_I8,  i32, sextloadi8_local>;
+def : DSReadPat <DS_READ_U8,  i32, az_extloadi8_local>;
+def : DSReadPat <DS_READ_I16, i32, sextloadi16_local>;
+def : DSReadPat <DS_READ_U16, i32, az_extloadi16_local>;
+def : DSReadPat <DS_READ_B32, i32, local_load>;
 def : Pat <
     (local_load i32:$src0),
     (i32 (DS_READ_B32 0, $src0, $src0, $src0, 0, 0))

test/CodeGen/R600/load.ll

@@ -438,3 +438,81 @@ define void @load_const_addrspace_f32(float addrspace(1)* %out, float addrspace(
   ret void
 }
 
+;===------------------------------------------------------------------------===;
+; LOCAL ADDRESS SPACE
+;===------------------------------------------------------------------------===;
+
+; Load an i8 value from the local address space.
+; R600-CHECK: @load_i8_local
+; R600-CHECK: LDS_UBYTE_READ_RET
+; SI-CHECK: @load_i8_local
+; SI-CHECK: DS_READ_U8
+define void @load_i8_local(i32 addrspace(1)* %out, i8 addrspace(3)* %in) {
+  %1 = load i8 addrspace(3)* %in
+  %2 = zext i8 %1 to i32
+  store i32 %2, i32 addrspace(1)* %out
+  ret void
+}
+
+; R600-CHECK: @load_i8_sext_local
+; R600-CHECK: LDS_UBYTE_READ_RET
+; R600-CHECK: ASHR
+; SI-CHECK: @load_i8_sext_local
+; SI-CHECK: DS_READ_I8
+define void @load_i8_sext_local(i32 addrspace(1)* %out, i8 addrspace(3)* %in) {
+entry:
+  %0 = load i8 addrspace(3)* %in
+  %1 = sext i8 %0 to i32
+  store i32 %1, i32 addrspace(1)* %out
+  ret void
+}
+
+; Load an i16 value from the local address space.
+; R600-CHECK: @load_i16_local
+; R600-CHECK: LDS_USHORT_READ_RET
+; SI-CHECK: @load_i16_local
+; SI-CHECK: DS_READ_U16
+define void @load_i16_local(i32 addrspace(1)* %out, i16 addrspace(3)* %in) {
+entry:
+  %0 = load i16	 addrspace(3)* %in
+  %1 = zext i16 %0 to i32
+  store i32 %1, i32 addrspace(1)* %out
+  ret void
+}
+
+; R600-CHECK: @load_i16_sext_local
+; R600-CHECK: LDS_USHORT_READ_RET
+; R600-CHECK: ASHR
+; SI-CHECK: @load_i16_sext_local
+; SI-CHECK: DS_READ_I16
+define void @load_i16_sext_local(i32 addrspace(1)* %out, i16 addrspace(3)* %in) {
+entry:
+  %0 = load i16 addrspace(3)* %in
+  %1 = sext i16 %0 to i32
+  store i32 %1, i32 addrspace(1)* %out
+  ret void
+}
+
+; load an i32 value from the glocal address space.
+; R600-CHECK: @load_i32_local
+; R600-CHECK: LDS_READ_RET
+; SI-CHECK: @load_i32_local
+; SI-CHECK: DS_READ_B32
+define void @load_i32_local(i32 addrspace(1)* %out, i32 addrspace(3)* %in) {
+entry:
+  %0 = load i32 addrspace(3)* %in
+  store i32 %0, i32 addrspace(1)* %out
+  ret void
+}
+
+; load a f32 value from the global address space.
+; R600-CHECK: @load_f32_local
+; R600-CHECK: LDS_READ_RET
+; SI-CHECK: @load_f32_local
+; SI-CHECK: DS_READ_B32
+define void @load_f32_local(float addrspace(1)* %out, float addrspace(3)* %in) {
+entry:
+  %0 = load float addrspace(3)* %in
+  store float %0, float addrspace(1)* %out
+  ret void
+}