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AMDGPU: Use generic bitreverse intrinsic

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Also fix bug in vector legalization for bitreverse.

llvm-svn: 255512
This commit is contained in:
Matt Arsenault 2015-12-14 17:25:38 +00:00
parent 8312ed978c
commit 3ca8d64e75
8 changed files with 143 additions and 37 deletions
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25
lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
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@ -105,6 +105,7 @@ class VectorLegalizer {
SDValue ExpandLoad(SDValue Op);
SDValue ExpandStore(SDValue Op);
SDValue ExpandFNEG(SDValue Op);
SDValue ExpandBITREVERSE(SDValue Op);
/// \brief Implements vector promotion.
///
@ -280,6 +281,7 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
case ISD::ROTL:
case ISD::ROTR:
case ISD::BSWAP:
case ISD::BITREVERSE:
case ISD::CTLZ:
case ISD::CTTZ:
case ISD::CTLZ_ZERO_UNDEF:
@ -417,7 +419,7 @@ SDValue VectorLegalizer::Promote(SDValue Op) {
else
Operands[j] = Op.getOperand(j);
}
Op = DAG.getNode(Op.getOpcode(), dl, NVT, Operands, Op.getNode()->getFlags());
if ((VT.isFloatingPoint() && NVT.isFloatingPoint()) ||
(VT.isVector() && VT.getVectorElementType().isFloatingPoint() &&
@ -715,6 +717,8 @@ SDValue VectorLegalizer::Expand(SDValue Op) {
return ExpandFNEG(Op);
case ISD::SETCC:
return UnrollVSETCC(Op);
case ISD::BITREVERSE:
return ExpandBITREVERSE(Op);
default:
return DAG.UnrollVectorOp(Op.getNode());
}
@ -900,6 +904,25 @@ SDValue VectorLegalizer::ExpandBSWAP(SDValue Op) {
return DAG.getNode(ISD::BITCAST, DL, VT, Op);
}
SDValue VectorLegalizer::ExpandBITREVERSE(SDValue Op) {
EVT VT = Op.getValueType();
// If we have the scalar operation, it's probably cheaper to unroll it.
if (TLI.isOperationLegalOrCustom(ISD::BITREVERSE, VT.getScalarType()))
return DAG.UnrollVectorOp(Op.getNode());
// If we have the appropriate vector bit operations, it is better to use them
// than unrolling and expanding each component.
if (!TLI.isOperationLegalOrCustom(ISD::SHL, VT) ||
!TLI.isOperationLegalOrCustom(ISD::SRL, VT) ||
!TLI.isOperationLegalOrCustom(ISD::AND, VT) ||
!TLI.isOperationLegalOrCustom(ISD::OR, VT))
return DAG.UnrollVectorOp(Op.getNode());
// Let LegalizeDAG handle this later.
return Op;
}
SDValue VectorLegalizer::ExpandVSELECT(SDValue Op) {
// Implement VSELECT in terms of XOR, AND, OR
// on platforms which do not support blend natively.

6
lib/Target/AMDGPU/AMDGPUISelLowering.cpp
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@ -1036,9 +1036,6 @@ SDValue AMDGPUTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
Op.getOperand(1),
Op.getOperand(2));
case AMDGPUIntrinsic::AMDGPU_brev:
return DAG.getNode(AMDGPUISD::BREV, DL, VT, Op.getOperand(1));
case Intrinsic::AMDGPU_class:
return DAG.getNode(AMDGPUISD::FP_CLASS, DL, VT,
Op.getOperand(1), Op.getOperand(2));
@ -1050,6 +1047,8 @@ SDValue AMDGPUTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
return DAG.getNode(ISD::FRINT, DL, VT, Op.getOperand(1));
case AMDGPUIntrinsic::AMDGPU_trunc: // Legacy name.
return DAG.getNode(ISD::FTRUNC, DL, VT, Op.getOperand(1));
case AMDGPUIntrinsic::AMDGPU_brev: // Legacy name
return DAG.getNode(ISD::BITREVERSE, DL, VT, Op.getOperand(1));
}
}
@ -2700,7 +2699,6 @@ const char* AMDGPUTargetLowering::getTargetNodeName(unsigned Opcode) const {
NODE_NAME_CASE(BFE_I32)
NODE_NAME_CASE(BFI)
NODE_NAME_CASE(BFM)
NODE_NAME_CASE(BREV)
NODE_NAME_CASE(MUL_U24)
NODE_NAME_CASE(MUL_I24)
NODE_NAME_CASE(MAD_U24)

1
lib/Target/AMDGPU/AMDGPUISelLowering.h
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@ -263,7 +263,6 @@ enum NodeType : unsigned {
BFE_I32, // Extract range of bits with sign extension to 32-bits.
BFI, // (src0 & src1) | (~src0 & src2)
BFM, // Insert a range of bits into a 32-bit word.
BREV, // Reverse bits.
MUL_U24,
MUL_I24,
MAD_U24,

2
lib/Target/AMDGPU/AMDGPUInstrInfo.td
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@ -191,8 +191,6 @@ def AMDGPUbfe_i32 : SDNode<"AMDGPUISD::BFE_I32", AMDGPUDTIntTernaryOp>;
def AMDGPUbfi : SDNode<"AMDGPUISD::BFI", AMDGPUDTIntTernaryOp>;
def AMDGPUbfm : SDNode<"AMDGPUISD::BFM", SDTIntBinOp>;
def AMDGPUbrev : SDNode<"AMDGPUISD::BREV", SDTIntUnaryOp>;
// Signed and unsigned 24-bit mulitply. The highest 8-bits are ignore when
// performing the mulitply. The result is a 32-bit value.
def AMDGPUmul_u24 : SDNode<"AMDGPUISD::MUL_U24", SDTIntBinOp,

1
lib/Target/AMDGPU/SIISelLowering.cpp
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@ -107,6 +107,7 @@ SITargetLowering::SITargetLowering(TargetMachine &TM,
setOperationAction(ISD::SETCC, MVT::v4i1, Expand);
setOperationAction(ISD::BSWAP, MVT::i32, Legal);
setOperationAction(ISD::BITREVERSE, MVT::i32, Legal);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Legal);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i1, Custom);

2
lib/Target/AMDGPU/SIInstructions.td
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@ -127,7 +127,7 @@ let Defs = [SCC] in {
defm S_BREV_B32 : SOP1_32 <sop1<0x0b, 0x08>, "s_brev_b32",
[(set i32:$dst, (AMDGPUbrev i32:$src0))]
[(set i32:$dst, (bitreverse i32:$src0))]
>;
defm S_BREV_B64 : SOP1_64 <sop1<0x0c, 0x09>, "s_brev_b64", []>;

115
test/CodeGen/AMDGPU/bitreverse.ll Normal file
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@ -0,0 +1,115 @@
; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
declare i16 @llvm.bitreverse.i16(i16) #1
declare i32 @llvm.bitreverse.i32(i32) #1
declare i64 @llvm.bitreverse.i64(i64) #1
declare <2 x i32> @llvm.bitreverse.v2i32(<2 x i32>) #1
declare <4 x i32> @llvm.bitreverse.v4i32(<4 x i32>) #1
declare <2 x i64> @llvm.bitreverse.v2i64(<2 x i64>) #1
declare <4 x i64> @llvm.bitreverse.v4i64(<4 x i64>) #1
declare i32 @llvm.AMDGPU.brev(i32) #1
; FUNC-LABEL: {{^}}s_brev_i16:
; SI: s_brev_b32
define void @s_brev_i16(i16 addrspace(1)* noalias %out, i16 %val) #0 {
%brev = call i16 @llvm.bitreverse.i16(i16 %val) #1
store i16 %brev, i16 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_brev_i16:
; SI: v_bfrev_b32_e32
define void @v_brev_i16(i16 addrspace(1)* noalias %out, i16 addrspace(1)* noalias %valptr) #0 {
%val = load i16, i16 addrspace(1)* %valptr
%brev = call i16 @llvm.bitreverse.i16(i16 %val) #1
store i16 %brev, i16 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}s_brev_i32:
; SI: s_load_dword [[VAL:s[0-9]+]],
; SI: s_brev_b32 [[SRESULT:s[0-9]+]], [[VAL]]
; SI: v_mov_b32_e32 [[VRESULT:v[0-9]+]], [[SRESULT]]
; SI: buffer_store_dword [[VRESULT]],
; SI: s_endpgm
define void @s_brev_i32(i32 addrspace(1)* noalias %out, i32 %val) #0 {
%brev = call i32 @llvm.bitreverse.i32(i32 %val) #1
store i32 %brev, i32 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_brev_i32:
; SI: buffer_load_dword [[VAL:v[0-9]+]],
; SI: v_bfrev_b32_e32 [[RESULT:v[0-9]+]], [[VAL]]
; SI: buffer_store_dword [[RESULT]],
; SI: s_endpgm
define void @v_brev_i32(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %valptr) #0 {
%val = load i32, i32 addrspace(1)* %valptr
%brev = call i32 @llvm.bitreverse.i32(i32 %val) #1
store i32 %brev, i32 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}s_brev_v2i32:
; SI: s_brev_b32
; SI: s_brev_b32
define void @s_brev_v2i32(<2 x i32> addrspace(1)* noalias %out, <2 x i32> %val) #0 {
%brev = call <2 x i32> @llvm.bitreverse.v2i32(<2 x i32> %val) #1
store <2 x i32> %brev, <2 x i32> addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_brev_v2i32:
; SI: v_bfrev_b32_e32
; SI: v_bfrev_b32_e32
define void @v_brev_v2i32(<2 x i32> addrspace(1)* noalias %out, <2 x i32> addrspace(1)* noalias %valptr) #0 {
%val = load <2 x i32>, <2 x i32> addrspace(1)* %valptr
%brev = call <2 x i32> @llvm.bitreverse.v2i32(<2 x i32> %val) #1
store <2 x i32> %brev, <2 x i32> addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}s_brev_i64:
define void @s_brev_i64(i64 addrspace(1)* noalias %out, i64 %val) #0 {
%brev = call i64 @llvm.bitreverse.i64(i64 %val) #1
store i64 %brev, i64 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_brev_i64:
define void @v_brev_i64(i64 addrspace(1)* noalias %out, i64 addrspace(1)* noalias %valptr) #0 {
%val = load i64, i64 addrspace(1)* %valptr
%brev = call i64 @llvm.bitreverse.i64(i64 %val) #1
store i64 %brev, i64 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}s_brev_v2i64:
define void @s_brev_v2i64(<2 x i64> addrspace(1)* noalias %out, <2 x i64> %val) #0 {
%brev = call <2 x i64> @llvm.bitreverse.v2i64(<2 x i64> %val) #1
store <2 x i64> %brev, <2 x i64> addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_brev_v2i64:
define void @v_brev_v2i64(<2 x i64> addrspace(1)* noalias %out, <2 x i64> addrspace(1)* noalias %valptr) #0 {
%val = load <2 x i64>, <2 x i64> addrspace(1)* %valptr
%brev = call <2 x i64> @llvm.bitreverse.v2i64(<2 x i64> %val) #1
store <2 x i64> %brev, <2 x i64> addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}legacy_s_brev_i32:
; SI: s_brev_b32
define void @legacy_s_brev_i32(i32 addrspace(1)* noalias %out, i32 %val) nounwind {
%brev = call i32 @llvm.AMDGPU.brev(i32 %val) #1
store i32 %brev, i32 addrspace(1)* %out
ret void
}
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }

28
test/CodeGen/AMDGPU/llvm.AMDGPU.brev.ll
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@ -1,28 +0,0 @@
; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
declare i32 @llvm.AMDGPU.brev(i32) nounwind readnone
; FUNC-LABEL: {{^}}s_brev_i32:
; SI: s_load_dword [[VAL:s[0-9]+]],
; SI: s_brev_b32 [[SRESULT:s[0-9]+]], [[VAL]]
; SI: v_mov_b32_e32 [[VRESULT:v[0-9]+]], [[SRESULT]]
; SI: buffer_store_dword [[VRESULT]],
; SI: s_endpgm
define void @s_brev_i32(i32 addrspace(1)* noalias %out, i32 %val) nounwind {
%ctlz = call i32 @llvm.AMDGPU.brev(i32 %val) nounwind readnone
store i32 %ctlz, i32 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}v_brev_i32:
; SI: buffer_load_dword [[VAL:v[0-9]+]],
; SI: v_bfrev_b32_e32 [[RESULT:v[0-9]+]], [[VAL]]
; SI: buffer_store_dword [[RESULT]],
; SI: s_endpgm
define void @v_brev_i32(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %valptr) nounwind {
%val = load i32, i32 addrspace(1)* %valptr, align 4
%ctlz = call i32 @llvm.AMDGPU.brev(i32 %val) nounwind readnone
store i32 %ctlz, i32 addrspace(1)* %out, align 4
ret void
}