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[NVPTX] Add lowering of i128 params.

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The patch adds support of i128 params lowering. The changes are quite trivial to
support i128 as a "special case" of integer type. With this patch, we lower i128
params the same way as aggregates of size 16 bytes: .param .b8 _ [16].

Currently, NVPTX can't deal with the 128 bit integers:
* in some cases because of failed assertions like
ValVTs.size() == OutVals.size() && "Bad return value decomposition"
* in other cases emitting PTX with .i128 or .u128 types (which are not valid [1])
[1] http://docs.nvidia.com/cuda/parallel-thread-execution/index.html#fundamental-types

Differential Revision: https://reviews.llvm.org/D34555
Patch by: Denys Zariaiev (denys.zariaiev@gmail.com)

llvm-svn: 307326
This commit is contained in:
Michael Kuperstein 2017-07-06 22:18:54 +00:00
parent 231abab692
commit dc71dcb613
6 changed files with 125 additions and 11 deletions
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14
lib/Target/NVPTX/NVPTXAsmPrinter.cpp
View File

@ -400,7 +400,7 @@ void NVPTXAsmPrinter::printReturnValStr(const Function *F, raw_ostream &O) {
O << " (";
if (isABI) {
if (Ty->isFloatingPointTy() || Ty->isIntegerTy()) {
if (Ty->isFloatingPointTy() || (Ty->isIntegerTy() && !Ty->isIntegerTy(128))) {
unsigned size = 0;
if (auto *ITy = dyn_cast<IntegerType>(Ty)) {
size = ITy->getBitWidth();
@ -418,7 +418,7 @@ void NVPTXAsmPrinter::printReturnValStr(const Function *F, raw_ostream &O) {
} else if (isa<PointerType>(Ty)) {
O << ".param .b" << TLI->getPointerTy(DL).getSizeInBits()
<< " func_retval0";
} else if (Ty->isAggregateType() || Ty->isVectorTy()) {
} else if (Ty->isAggregateType() || Ty->isVectorTy() || Ty->isIntegerTy(128)) {
unsigned totalsz = DL.getTypeAllocSize(Ty);
unsigned retAlignment = 0;
if (!getAlign(*F, 0, retAlignment))
@ -1425,6 +1425,14 @@ void NVPTXAsmPrinter::emitPTXGlobalVariable(const GlobalVariable *GVar,
else
O << " .align " << GVar->getAlignment();
// Special case for i128
if (ETy->isIntegerTy(128)) {
O << " .b8 ";
getSymbol(GVar)->print(O, MAI);
O << "[16]";
return;
}
if (ETy->isFloatingPointTy() || ETy->isIntegerTy() || ETy->isPointerTy()) {
O << " .";
O << getPTXFundamentalTypeStr(ETy);
@ -1551,7 +1559,7 @@ void NVPTXAsmPrinter::emitFunctionParamList(const Function *F, raw_ostream &O) {
}
if (!PAL.hasParamAttribute(paramIndex, Attribute::ByVal)) {
if (Ty->isAggregateType() || Ty->isVectorTy()) {
if (Ty->isAggregateType() || Ty->isVectorTy() || Ty->isIntegerTy(128)) {
// Just print .param .align <a> .b8 .param[size];
// <a> = PAL.getparamalignment
// size = typeallocsize of element type

27
lib/Target/NVPTX/NVPTXISelLowering.cpp
View File

@ -169,6 +169,19 @@ static void ComputePTXValueVTs(const TargetLowering &TLI, const DataLayout &DL,
SmallVector<EVT, 16> TempVTs;
SmallVector<uint64_t, 16> TempOffsets;
// Special case for i128 - decompose to (i64, i64)
if (Ty->isIntegerTy(128)) {
ValueVTs.push_back(EVT(MVT::i64));
ValueVTs.push_back(EVT(MVT::i64));
if (Offsets) {
Offsets->push_back(StartingOffset + 0);
Offsets->push_back(StartingOffset + 8);
}
return;
}
ComputeValueVTs(TLI, DL, Ty, TempVTs, &TempOffsets, StartingOffset);
for (unsigned i = 0, e = TempVTs.size(); i != e; ++i) {
EVT VT = TempVTs[i];
@ -1263,7 +1276,7 @@ std::string NVPTXTargetLowering::getPrototype(
O << "()";
} else {
O << "(";
if (retTy->isFloatingPointTy() || retTy->isIntegerTy()) {
if (retTy->isFloatingPointTy() || (retTy->isIntegerTy() && !retTy->isIntegerTy(128))) {
unsigned size = 0;
if (auto *ITy = dyn_cast<IntegerType>(retTy)) {
size = ITy->getBitWidth();
@ -1281,7 +1294,7 @@ std::string NVPTXTargetLowering::getPrototype(
O << ".param .b" << size << " _";
} else if (isa<PointerType>(retTy)) {
O << ".param .b" << PtrVT.getSizeInBits() << " _";
} else if (retTy->isAggregateType() || retTy->isVectorTy()) {
} else if (retTy->isAggregateType() || retTy->isVectorTy() || retTy->isIntegerTy(128)) {
auto &DL = CS->getCalledFunction()->getParent()->getDataLayout();
O << ".param .align " << retAlignment << " .b8 _["
<< DL.getTypeAllocSize(retTy) << "]";
@ -1303,7 +1316,7 @@ std::string NVPTXTargetLowering::getPrototype(
first = false;
if (!Outs[OIdx].Flags.isByVal()) {
if (Ty->isAggregateType() || Ty->isVectorTy()) {
if (Ty->isAggregateType() || Ty->isVectorTy() || Ty->isIntegerTy(128)) {
unsigned align = 0;
const CallInst *CallI = cast<CallInst>(CS->getInstruction());
// +1 because index 0 is reserved for return type alignment
@ -1459,7 +1472,7 @@ SDValue NVPTXTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
unsigned AllocSize = DL.getTypeAllocSize(Ty);
SDVTList DeclareParamVTs = DAG.getVTList(MVT::Other, MVT::Glue);
bool NeedAlign; // Does argument declaration specify alignment?
if (Ty->isAggregateType() || Ty->isVectorTy()) {
if (Ty->isAggregateType() || Ty->isVectorTy() || Ty->isIntegerTy(128)) {
// declare .param .align <align> .b8 .param<n>[<size>];
SDValue DeclareParamOps[] = {
Chain, DAG.getConstant(ArgAlign, dl, MVT::i32),
@ -1635,8 +1648,8 @@ SDValue NVPTXTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
// these three types to match the logic in
// NVPTXAsmPrinter::printReturnValStr and NVPTXTargetLowering::getPrototype.
// Plus, this behavior is consistent with nvcc's.
if (RetTy->isFloatingPointTy() || RetTy->isIntegerTy() ||
RetTy->isPointerTy()) {
if (RetTy->isFloatingPointTy() || RetTy->isPointerTy() ||
(RetTy->isIntegerTy() && !RetTy->isIntegerTy(128))) {
// Scalar needs to be at least 32bit wide
if (resultsz < 32)
resultsz = 32;
@ -2367,7 +2380,7 @@ SDValue NVPTXTargetLowering::LowerFormalArguments(
if (theArgs[i]->use_empty()) {
// argument is dead
if (Ty->isAggregateType()) {
if (Ty->isAggregateType() || Ty->isIntegerTy(128)) {
SmallVector<EVT, 16> vtparts;
ComputePTXValueVTs(*this, DAG.getDataLayout(), Ty, vtparts);

2
lib/Target/NVPTX/NVPTXTargetMachine.cpp
View File

@ -81,7 +81,7 @@ static std::string computeDataLayout(bool is64Bit) {
if (!is64Bit)
Ret += "-p:32:32";
Ret += "-i64:64-v16:16-v32:32-n16:32:64";
Ret += "-i64:64-i128:128-v16:16-v32:32-n16:32:64";
return Ret;
}

7
test/CodeGen/NVPTX/i128-global.ll Normal file
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@ -0,0 +1,7 @@
; RUN: llc < %s -O0 -march=nvptx64 -mcpu=sm_20 | FileCheck %s
; CHECK: .visible .global .align 16 .b8 G1[16] = {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
@G1 = global i128 1
; CHECK: .visible .global .align 16 .b8 G2[16];
@G2 = global i128 0

58
test/CodeGen/NVPTX/i128-param.ll Normal file
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@ -0,0 +1,58 @@
; RUN: llc < %s -O0 -march=nvptx -mcpu=sm_20 | FileCheck %s
; CHECK-LABEL: .visible .func callee(
; CHECK-NEXT: .param .align 16 .b8 callee_param_0[16],
; CHECK-NEXT: .param .align 16 .b8 callee_param_1[16],
define void @callee(i128, i128, i128*) {
; CHECK-DAG: ld.param.v2.u64 {%[[REG0:rd[0-9]+]], %[[REG1:rd[0-9]+]]}, [callee_param_0];
; CHECK-DAG: ld.param.v2.u64 {%[[REG2:rd[0-9]+]], %[[REG3:rd[0-9]+]]}, [callee_param_1];
; CHECK: mul.lo.s64 %[[REG4:rd[0-9]+]], %[[REG0]], %[[REG3]];
; CHECK-NEXT: mul.hi.u64 %[[REG5:rd[0-9]+]], %[[REG0]], %[[REG2]];
; CHECK-NEXT: add.s64 %[[REG6:rd[0-9]+]], %[[REG5]], %[[REG4]];
; CHECK-NEXT: mul.lo.s64 %[[REG7:rd[0-9]+]], %[[REG1]], %[[REG2]];
; CHECK-NEXT: add.s64 %[[REG8:rd[0-9]+]], %[[REG6]], %[[REG7]];
; CHECK-NEXT: mul.lo.s64 %[[REG9:rd[0-9]+]], %[[REG0]], %[[REG2]];
%a = mul i128 %0, %1
store i128 %a, i128* %2
ret void
}
; CHECK-LABEL: .visible .entry caller_kernel(
; CHECK-NEXT: .param .align 16 .b8 caller_kernel_param_0[16],
; CHECK-NEXT: .param .align 16 .b8 caller_kernel_param_1[16],
define ptx_kernel void @caller_kernel(i128, i128, i128*) {
start:
; CHECK-DAG: ld.param.v2.u64 {%[[REG0:rd[0-9]+]], %[[REG1:rd[0-9]+]]}, [caller_kernel_param_0];
; CHECK-DAG: ld.param.v2.u64 {%[[REG2:rd[0-9]+]], %[[REG3:rd[0-9]+]]}, [caller_kernel_param_1];
; CHECK: { // callseq [[CALLSEQ_ID:[0-9]]], 0
; CHECK: .param .align 16 .b8 param0[16];
; CHECK-NEXT: st.param.v2.b64 [param0+0], {%[[REG0]], %[[REG1]]}
; CHECK: .param .align 16 .b8 param1[16];
; CHECK-NEXT: st.param.v2.b64 [param1+0], {%[[REG2]], %[[REG3]]}
; CHECK: } // callseq [[CALLSEQ_ID]]
call void @callee(i128 %0, i128 %1, i128* %2)
ret void
}
; CHECK-LABEL: .visible .func caller_func(
; CHECK-NEXT: .param .align 16 .b8 caller_func_param_0[16],
; CHECK-NEXT: .param .align 16 .b8 caller_func_param_1[16],
define void @caller_func(i128, i128, i128*) {
start:
; CHECK-DAG: ld.param.v2.u64 {%[[REG0:rd[0-9]+]], %[[REG1:rd[0-9]+]]}, [caller_func_param_0]
; CHECK-DAG: ld.param.v2.u64 {%[[REG2:rd[0-9]+]], %[[REG3:rd[0-9]+]]}, [caller_func_param_1]
; CHECK: { // callseq [[CALLSEQ_ID:[0-9]]], 0
; CHECK: .param .align 16 .b8 param0[16];
; CHECK: st.param.v2.b64 [param0+0], {%[[REG0]], %[[REG1]]}
; CHECK: .param .align 16 .b8 param1[16];
; CHECK: st.param.v2.b64 [param1+0], {%[[REG2]], %[[REG3]]}
; CHECK: } // callseq [[CALLSEQ_ID]]
call void @callee(i128 %0, i128 %1, i128* %2)
ret void
}

28
test/CodeGen/NVPTX/i128-retval.ll Normal file
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@ -0,0 +1,28 @@
; RUN: llc < %s -O0 -march=nvptx64 -mcpu=sm_20 | FileCheck %s
; CHECK-LABEL: .visible .func (.param .align 16 .b8 func_retval0[16]) callee(
define i128 @callee(i128) {
; CHECK: ld.param.v2.u64 {%[[REG0:rd[0-9]+]], %[[REG1:rd[0-9]+]]}, [callee_param_0];
; CHECK: st.param.v2.b64 [func_retval0+0], {%[[REG0]], %[[REG1]]}
ret i128 %0
}
; CHECK-LABEL: .visible .func caller(
define void @caller(i128, i128*) {
start:
; CHECK-DAG: ld.param.v2.u64 {%[[REG0:rd[0-9]+]], %[[REG1:rd[0-9]+]]}, [caller_param_0];
; CHECK-DAG: ld.param.u64 %[[OUT:rd[0-9]+]], [caller_param_1];
; CHECK: { // callseq 0, 0
; CHECK: .param .align 16 .b8 retval0[16];
; CHECK: call.uni (retval0),
; CHECK: ld.param.v2.b64 {%[[REG2:rd[0-9]+]], %[[REG3:rd[0-9]+]]}, [retval0+0];
; CHECK: } // callseq 0
%a = call i128 @callee(i128 %0)
; CHECK-DAG: st.u64 [%[[OUT]]], %[[REG2]];
; CHECK-DAG: st.u64 [%[[OUT]]+8], %[[REG3]];
store i128 %a, i128* %1
ret void
}