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R600/SI: Handle i64 sub.

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We can handle it the same way as add

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211514 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-06-23 18:00:38 +00:00
parent e564b6ed79
commit c4471e9248
5 changed files with 60 additions and 32 deletions
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33
lib/Target/R600/AMDGPUISelDAGToDAG.cpp
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@ -85,7 +85,7 @@ private:
bool SelectADDRVTX_READ(SDValue Addr, SDValue &Base, SDValue &Offset);
bool SelectADDRIndirect(SDValue Addr, SDValue &Base, SDValue &Offset);
SDNode *SelectADD_I64(SDNode *N);
SDNode *SelectADD_SUB_I64(SDNode *N);
// Include the pieces autogenerated from the target description.
#include "AMDGPUGenDAGISel.inc"
@ -214,12 +214,13 @@ SDNode *AMDGPUDAGToDAGISel::Select(SDNode *N) {
// We are selecting i64 ADD here instead of custom lower it during
// DAG legalization, so we can fold some i64 ADDs used for address
// calculation into the LOAD and STORE instructions.
case ISD::ADD: {
case ISD::ADD:
case ISD::SUB: {
if (N->getValueType(0) != MVT::i64 ||
ST.getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS)
break;
return SelectADD_I64(N);
return SelectADD_SUB_I64(N);
}
case ISD::SCALAR_TO_VECTOR:
case AMDGPUISD::BUILD_VERTICAL_VECTOR:
@ -646,11 +647,13 @@ bool AMDGPUDAGToDAGISel::SelectADDRIndirect(SDValue Addr, SDValue &Base,
return true;
}
SDNode *AMDGPUDAGToDAGISel::SelectADD_I64(SDNode *N) {
SDNode *AMDGPUDAGToDAGISel::SelectADD_SUB_I64(SDNode *N) {
SDLoc DL(N);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
bool IsAdd = (N->getOpcode() == ISD::ADD);
SDValue Sub0 = CurDAG->getTargetConstant(AMDGPU::sub0, MVT::i32);
SDValue Sub1 = CurDAG->getTargetConstant(AMDGPU::sub1, MVT::i32);
@ -665,16 +668,22 @@ SDNode *AMDGPUDAGToDAGISel::SelectADD_I64(SDNode *N) {
DL, MVT::i32, RHS, Sub1);
SDVTList VTList = CurDAG->getVTList(MVT::i32, MVT::Glue);
SDValue AddLoArgs[] = { SDValue(Lo0, 0), SDValue(Lo1, 0) };
SDNode *AddLo = CurDAG->getMachineNode(
isCFDepth0() ? AMDGPU::S_ADD_I32 : AMDGPU::V_ADD_I32_e32,
DL, VTList, AddLoArgs);
SDValue Carry = SDValue(AddLo, 1);
SDNode *AddHi = CurDAG->getMachineNode(
isCFDepth0() ? AMDGPU::S_ADDC_U32 : AMDGPU::V_ADDC_U32_e32,
DL, MVT::i32, SDValue(Hi0, 0), SDValue(Hi1, 0), Carry);
unsigned Opc = IsAdd ? AMDGPU::S_ADD_I32 : AMDGPU::S_SUB_I32;
unsigned CarryOpc = IsAdd ? AMDGPU::S_ADDC_U32 : AMDGPU::S_SUBB_U32;
if (!isCFDepth0()) {
Opc = IsAdd ? AMDGPU::V_ADD_I32_e32 : AMDGPU::V_SUB_I32_e32;
CarryOpc = IsAdd ? AMDGPU::V_ADDC_U32_e32 : AMDGPU::V_SUBB_U32_e32;
}
SDNode *AddLo = CurDAG->getMachineNode( Opc, DL, VTList, AddLoArgs);
SDValue Carry(AddLo, 1);
SDNode *AddHi
= CurDAG->getMachineNode(CarryOpc, DL, MVT::i32,
SDValue(Hi0, 0), SDValue(Hi1, 0), Carry);
SDValue Args[5] = {
CurDAG->getTargetConstant(AMDGPU::SReg_64RegClassID, MVT::i32),

1
lib/Target/R600/AMDGPUISelLowering.cpp
View File

@ -264,7 +264,6 @@ AMDGPUTargetLowering::AMDGPUTargetLowering(TargetMachine &TM) :
setOperationAction(ISD::MUL, MVT::i64, Expand);
setOperationAction(ISD::MULHU, MVT::i64, Expand);
setOperationAction(ISD::MULHS, MVT::i64, Expand);
setOperationAction(ISD::SUB, MVT::i64, Expand);
setOperationAction(ISD::UDIV, MVT::i32, Expand);
setOperationAction(ISD::UREM, MVT::i32, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::i64, Custom);

2
lib/Target/R600/R600ISelLowering.cpp
View File

@ -152,6 +152,8 @@ R600TargetLowering::R600TargetLowering(TargetMachine &TM) :
setTargetDAGCombine(ISD::SELECT_CC);
setTargetDAGCombine(ISD::INSERT_VECTOR_ELT);
setOperationAction(ISD::SUB, MVT::i64, Expand);
// These should be replaced by UDVIREM, but it does not happen automatically
// during Type Legalization
setOperationAction(ISD::UDIV, MVT::i64, Custom);

2
lib/Target/R600/SIISelLowering.cpp
View File

@ -77,6 +77,8 @@ SITargetLowering::SITargetLowering(TargetMachine &TM) :
setOperationAction(ISD::ADD, MVT::i32, Legal);
setOperationAction(ISD::ADDC, MVT::i32, Legal);
setOperationAction(ISD::ADDE, MVT::i32, Legal);
setOperationAction(ISD::SUBC, MVT::i32, Legal);
setOperationAction(ISD::SUBE, MVT::i32, Legal);
// We need to custom lower vector stores from local memory
setOperationAction(ISD::LOAD, MVT::v2i32, Custom);

54
test/CodeGen/R600/sub.ll
View File

@ -1,5 +1,7 @@
;RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck --check-prefix=EG --check-prefix=FUNC %s
;RUN: llc < %s -march=r600 -mcpu=verde -verify-machineinstrs | FileCheck --check-prefix=SI --check-prefix=FUNC %s
;RUN: llc -march=r600 -mcpu=redwood < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s
;RUN: llc -march=r600 -mcpu=verde -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
declare i32 @llvm.r600.read.tidig.x() readnone
;FUNC-LABEL: @test2
;EG: SUB_INT {{\** *}}T{{[0-9]+\.[XYZW], T[0-9]+\.[XYZW], T[0-9]+\.[XYZW]}}
@ -37,23 +39,37 @@ define void @test4(<4 x i32> addrspace(1)* %out, <4 x i32> addrspace(1)* %in) {
ret void
}
;FUNC_LABEL: @test5
; FUNC-LABEL: @s_sub_i64:
; SI: S_SUB_I32
; SI: S_SUBB_U32
;EG-DAG: SETGE_UINT
;EG-DAG: CNDE_INT
;EG-DAG: SUB_INT
;EG-DAG: SUB_INT
;EG-DAG: SUB_INT
;SI: S_NOT_B64
;SI-DAG: S_ADD_I32
;SI-DAG: S_ADDC_U32
;SI-DAG: S_ADD_I32
;SI-DAG: S_ADDC_U32
define void @test5(i64 addrspace(1)* %out, i64 %a, i64 %b) {
entry:
%0 = sub i64 %a, %b
store i64 %0, i64 addrspace(1)* %out
; EG-DAG: SETGE_UINT
; EG-DAG: CNDE_INT
; EG-DAG: SUB_INT
; EG-DAG: SUB_INT
; EG-DAG: SUB_INT
define void @s_sub_i64(i64 addrspace(1)* noalias %out, i64 %a, i64 %b) nounwind {
%result = sub i64 %a, %b
store i64 %result, i64 addrspace(1)* %out, align 8
ret void
}
; FUNC-LABEL: @v_sub_i64:
; SI: V_SUB_I32_e32
; SI: V_SUBB_U32_e32
; EG-DAG: SETGE_UINT
; EG-DAG: CNDE_INT
; EG-DAG: SUB_INT
; EG-DAG: SUB_INT
; EG-DAG: SUB_INT
define void @v_sub_i64(i64 addrspace(1)* noalias %out, i64 addrspace(1)* noalias %inA, i64 addrspace(1)* noalias %inB) nounwind {
%tid = call i32 @llvm.r600.read.tidig.x() readnone
%a_ptr = getelementptr i64 addrspace(1)* %inA, i32 %tid
%b_ptr = getelementptr i64 addrspace(1)* %inB, i32 %tid
%a = load i64 addrspace(1)* %a_ptr
%b = load i64 addrspace(1)* %b_ptr
%result = sub i64 %a, %b
store i64 %result, i64 addrspace(1)* %out, align 8
ret void
}