From: Matt Arsenault Date: Fri, 6 Nov 2015 18:01:57 +0000 (+0000) Subject: AMDGPU: Add pass to detect used kernel features X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=454a57ccb6a7b85c960074109d2e8c18b0a7f0ab AMDGPU: Add pass to detect used kernel features Mark kernels that use certain features that require user SGPRs to support with kernel attributes. We need to know before instruction selection begins because it impacts the kernel calling convention lowering. For now this only detects the workitem intrinsics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252323 91177308-0d34-0410-b5e6-96231b3b80d8 --- diff --git a/lib/Target/AMDGPU/AMDGPU.h b/lib/Target/AMDGPU/AMDGPU.h index a574794f378..80766086e15 100644 --- a/lib/Target/AMDGPU/AMDGPU.h +++ b/lib/Target/AMDGPU/AMDGPU.h @@ -50,6 +50,10 @@ FunctionPass *createSICodeEmitterPass(formatted_raw_ostream &OS); FunctionPass *createSIInsertWaits(TargetMachine &tm); FunctionPass *createSIPrepareScratchRegs(); +ModulePass *createAMDGPUAnnotateKernelFeaturesPass(); +void initializeAMDGPUAnnotateKernelFeaturesPass(PassRegistry &); +extern char &AMDGPUAnnotateKernelFeaturesID; + void initializeSIFoldOperandsPass(PassRegistry &); extern char &SIFoldOperandsID; diff --git a/lib/Target/AMDGPU/AMDGPUAnnotateKernelFeatures.cpp b/lib/Target/AMDGPU/AMDGPUAnnotateKernelFeatures.cpp new file mode 100644 index 00000000000..e57415f3b8e --- /dev/null +++ b/lib/Target/AMDGPU/AMDGPUAnnotateKernelFeatures.cpp @@ -0,0 +1,125 @@ +//===-- AMDGPUAnnotateKernelFeaturesPass.cpp ------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +/// \file This pass adds target attributes to functions which use intrinsics +/// which will impact calling convention lowering. +// +//===----------------------------------------------------------------------===// + +#include "AMDGPU.h" +#include "llvm/IR/Instructions.h" +#include "llvm/IR/Module.h" + +#define DEBUG_TYPE "amdgpu-annotate-kernel-features" + +using namespace llvm; + +namespace { + +class AMDGPUAnnotateKernelFeatures : public ModulePass { +private: + void addAttrToCallers(Function *Intrin, StringRef AttrName); + bool addAttrsForIntrinsics(Module &M, ArrayRef); + +public: + static char ID; + + AMDGPUAnnotateKernelFeatures() : ModulePass(ID) { } + bool runOnModule(Module &M) override; + const char *getPassName() const override { + return "AMDGPU Annotate Kernel Features"; + } + + void getAnalysisUsage(AnalysisUsage &AU) const override { + AU.setPreservesAll(); + ModulePass::getAnalysisUsage(AU); + } +}; + +} + +char AMDGPUAnnotateKernelFeatures::ID = 0; + +char &llvm::AMDGPUAnnotateKernelFeaturesID = AMDGPUAnnotateKernelFeatures::ID; + + +INITIALIZE_PASS_BEGIN(AMDGPUAnnotateKernelFeatures, DEBUG_TYPE, + "Add AMDGPU function attributes", false, false) +INITIALIZE_PASS_END(AMDGPUAnnotateKernelFeatures, DEBUG_TYPE, + "Add AMDGPU function attributes", false, false) + + +void AMDGPUAnnotateKernelFeatures::addAttrToCallers(Function *Intrin, + StringRef AttrName) { + SmallPtrSet SeenFuncs; + + for (User *U : Intrin->users()) { + // CallInst is the only valid user for an intrinsic. + CallInst *CI = cast(U); + + Function *CallingFunction = CI->getParent()->getParent(); + if (SeenFuncs.insert(CallingFunction).second) + CallingFunction->addFnAttr(AttrName); + } +} + +bool AMDGPUAnnotateKernelFeatures::addAttrsForIntrinsics( + Module &M, + ArrayRef IntrinsicToAttr) { + bool Changed = false; + + for (const StringRef *Arr : IntrinsicToAttr) { + if (Function *Fn = M.getFunction(Arr[0])) { + addAttrToCallers(Fn, Arr[1]); + Changed = true; + } + } + + return Changed; +} + +bool AMDGPUAnnotateKernelFeatures::runOnModule(Module &M) { + Triple TT(M.getTargetTriple()); + + static const StringRef IntrinsicToAttr[][2] = { + // .x omitted + { "llvm.r600.read.tgid.y", "amdgpu-work-group-id-y" }, + { "llvm.r600.read.tgid.z", "amdgpu-work-group-id-z" }, + + // .x omitted + { "llvm.r600.read.tidig.y", "amdgpu-work-item-id-y" }, + { "llvm.r600.read.tidig.z", "amdgpu-work-item-id-z" } + + }; + + static const StringRef HSAIntrinsicToAttr[][2] = { + { "llvm.r600.read.local.size.x", "amdgpu-dispatch-ptr" }, + { "llvm.r600.read.local.size.y", "amdgpu-dispatch-ptr" }, + { "llvm.r600.read.local.size.z", "amdgpu-dispatch-ptr" }, + + { "llvm.r600.read.global.size.x", "amdgpu-dispatch-ptr" }, + { "llvm.r600.read.global.size.y", "amdgpu-dispatch-ptr" }, + { "llvm.r600.read.global.size.z", "amdgpu-dispatch-ptr" } + }; + + // TODO: Intrinsics that require queue ptr. + + // We do not need to note the x workitem or workgroup id because they are + // always initialized. + + bool Changed = addAttrsForIntrinsics(M, IntrinsicToAttr); + if (TT.getOS() == Triple::AMDHSA) + Changed |= addAttrsForIntrinsics(M, HSAIntrinsicToAttr); + + return Changed; +} + +ModulePass *llvm::createAMDGPUAnnotateKernelFeaturesPass() { + return new AMDGPUAnnotateKernelFeatures(); +} diff --git a/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp index ab40d170a4c..4e31c7ab4d4 100644 --- a/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp +++ b/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp @@ -50,6 +50,7 @@ extern "C" void LLVMInitializeAMDGPUTarget() { initializeSIFixSGPRLiveRangesPass(*PR); initializeSIFixControlFlowLiveIntervalsPass(*PR); initializeSILoadStoreOptimizerPass(*PR); + initializeAMDGPUAnnotateKernelFeaturesPass(*PR); } static std::unique_ptr createTLOF(const Triple &TT) { @@ -195,8 +196,10 @@ void AMDGPUPassConfig::addIRPasses() { // functions, then we will generate code for the first function // without ever running any passes on the second. addPass(createBarrierNoopPass()); + // Handle uses of OpenCL image2d_t, image3d_t and sampler_t arguments. addPass(createAMDGPUOpenCLImageTypeLoweringPass()); + TargetPassConfig::addIRPasses(); } @@ -268,6 +271,11 @@ TargetPassConfig *R600TargetMachine::createPassConfig(PassManagerBase &PM) { bool GCNPassConfig::addPreISel() { AMDGPUPassConfig::addPreISel(); + + // FIXME: We need to run a pass to propagate the attributes when calls are + // supported. + addPass(&AMDGPUAnnotateKernelFeaturesID); + addPass(createSinkingPass()); addPass(createSITypeRewriter()); addPass(createSIAnnotateControlFlowPass()); diff --git a/lib/Target/AMDGPU/CMakeLists.txt b/lib/Target/AMDGPU/CMakeLists.txt index 855405695ef..09e750be789 100644 --- a/lib/Target/AMDGPU/CMakeLists.txt +++ b/lib/Target/AMDGPU/CMakeLists.txt @@ -15,6 +15,7 @@ add_public_tablegen_target(AMDGPUCommonTableGen) add_llvm_target(AMDGPUCodeGen AMDILCFGStructurizer.cpp AMDGPUAlwaysInlinePass.cpp + AMDGPUAnnotateKernelFeatures.cpp AMDGPUAsmPrinter.cpp AMDGPUDiagnosticInfoUnsupported.cpp AMDGPUFrameLowering.cpp diff --git a/test/CodeGen/AMDGPU/annotate-kernel-features.ll b/test/CodeGen/AMDGPU/annotate-kernel-features.ll new file mode 100644 index 00000000000..b116c72322b --- /dev/null +++ b/test/CodeGen/AMDGPU/annotate-kernel-features.ll @@ -0,0 +1,193 @@ +; RUN: opt -mtriple=amdgcn-unknown-amdhsa -S -amdgpu-annotate-kernel-features < %s | FileCheck -check-prefix=HSA -check-prefix=ALL %s +; RUN: opt -S -amdgpu-annotate-kernel-features < %s | FileCheck -check-prefix=NOHSA -check-prefix=ALL %s + +declare i32 @llvm.r600.read.tgid.x() #0 +declare i32 @llvm.r600.read.tgid.y() #0 +declare i32 @llvm.r600.read.tgid.z() #0 + +declare i32 @llvm.r600.read.tidig.x() #0 +declare i32 @llvm.r600.read.tidig.y() #0 +declare i32 @llvm.r600.read.tidig.z() #0 + +declare i32 @llvm.r600.read.local.size.x() #0 +declare i32 @llvm.r600.read.local.size.y() #0 +declare i32 @llvm.r600.read.local.size.z() #0 + +declare i32 @llvm.r600.read.global.size.x() #0 +declare i32 @llvm.r600.read.global.size.y() #0 +declare i32 @llvm.r600.read.global.size.z() #0 + + +; ALL: define void @use_tgid_x(i32 addrspace(1)* %ptr) #1 { +define void @use_tgid_x(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.tgid.x() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tgid_y(i32 addrspace(1)* %ptr) #2 { +define void @use_tgid_y(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.tgid.y() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @multi_use_tgid_y(i32 addrspace(1)* %ptr) #2 { +define void @multi_use_tgid_y(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tgid.y() + store volatile i32 %val0, i32 addrspace(1)* %ptr + %val1 = call i32 @llvm.r600.read.tgid.y() + store volatile i32 %val1, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tgid_x_y(i32 addrspace(1)* %ptr) #2 { +define void @use_tgid_x_y(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tgid.x() + %val1 = call i32 @llvm.r600.read.tgid.y() + store volatile i32 %val0, i32 addrspace(1)* %ptr + store volatile i32 %val1, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tgid_z(i32 addrspace(1)* %ptr) #3 { +define void @use_tgid_z(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.tgid.z() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tgid_x_z(i32 addrspace(1)* %ptr) #3 { +define void @use_tgid_x_z(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tgid.x() + %val1 = call i32 @llvm.r600.read.tgid.z() + store volatile i32 %val0, i32 addrspace(1)* %ptr + store volatile i32 %val1, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tgid_y_z(i32 addrspace(1)* %ptr) #4 { +define void @use_tgid_y_z(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tgid.y() + %val1 = call i32 @llvm.r600.read.tgid.z() + store volatile i32 %val0, i32 addrspace(1)* %ptr + store volatile i32 %val1, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tgid_x_y_z(i32 addrspace(1)* %ptr) #4 { +define void @use_tgid_x_y_z(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tgid.x() + %val1 = call i32 @llvm.r600.read.tgid.y() + %val2 = call i32 @llvm.r600.read.tgid.z() + store volatile i32 %val0, i32 addrspace(1)* %ptr + store volatile i32 %val1, i32 addrspace(1)* %ptr + store volatile i32 %val2, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tidig_x(i32 addrspace(1)* %ptr) #1 { +define void @use_tidig_x(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.tidig.x() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tidig_y(i32 addrspace(1)* %ptr) #5 { +define void @use_tidig_y(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.tidig.y() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tidig_z(i32 addrspace(1)* %ptr) #6 { +define void @use_tidig_z(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.tidig.z() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tidig_x_tgid_x(i32 addrspace(1)* %ptr) #1 { +define void @use_tidig_x_tgid_x(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tidig.x() + %val1 = call i32 @llvm.r600.read.tgid.x() + store volatile i32 %val0, i32 addrspace(1)* %ptr + store volatile i32 %val1, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tidig_y_tgid_y(i32 addrspace(1)* %ptr) #7 { +define void @use_tidig_y_tgid_y(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tidig.y() + %val1 = call i32 @llvm.r600.read.tgid.y() + store volatile i32 %val0, i32 addrspace(1)* %ptr + store volatile i32 %val1, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_tidig_x_y_z(i32 addrspace(1)* %ptr) #8 { +define void @use_tidig_x_y_z(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tidig.x() + %val1 = call i32 @llvm.r600.read.tidig.y() + %val2 = call i32 @llvm.r600.read.tidig.z() + store volatile i32 %val0, i32 addrspace(1)* %ptr + store volatile i32 %val1, i32 addrspace(1)* %ptr + store volatile i32 %val2, i32 addrspace(1)* %ptr + ret void +} + +; ALL: define void @use_all_workitems(i32 addrspace(1)* %ptr) #9 { +define void @use_all_workitems(i32 addrspace(1)* %ptr) #1 { + %val0 = call i32 @llvm.r600.read.tidig.x() + %val1 = call i32 @llvm.r600.read.tidig.y() + %val2 = call i32 @llvm.r600.read.tidig.z() + %val3 = call i32 @llvm.r600.read.tgid.x() + %val4 = call i32 @llvm.r600.read.tgid.y() + %val5 = call i32 @llvm.r600.read.tgid.z() + store volatile i32 %val0, i32 addrspace(1)* %ptr + store volatile i32 %val1, i32 addrspace(1)* %ptr + store volatile i32 %val2, i32 addrspace(1)* %ptr + store volatile i32 %val3, i32 addrspace(1)* %ptr + store volatile i32 %val4, i32 addrspace(1)* %ptr + store volatile i32 %val5, i32 addrspace(1)* %ptr + ret void +} + +; HSA: define void @use_get_local_size_x(i32 addrspace(1)* %ptr) #10 { +; NOHSA: define void @use_get_local_size_x(i32 addrspace(1)* %ptr) #1 { +define void @use_get_local_size_x(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.local.size.x() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +; HSA: define void @use_get_local_size_y(i32 addrspace(1)* %ptr) #10 { +; NOHSA: define void @use_get_local_size_y(i32 addrspace(1)* %ptr) #1 { +define void @use_get_local_size_y(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.local.size.y() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +; HSA: define void @use_get_local_size_z(i32 addrspace(1)* %ptr) #10 { +; NOHSA: define void @use_get_local_size_z(i32 addrspace(1)* %ptr) #1 { +define void @use_get_local_size_z(i32 addrspace(1)* %ptr) #1 { + %val = call i32 @llvm.r600.read.local.size.z() + store i32 %val, i32 addrspace(1)* %ptr + ret void +} + +attributes #0 = { nounwind readnone } +attributes #1 = { nounwind } + +; HSA: attributes #0 = { nounwind readnone } +; HSA: attributes #1 = { nounwind } +; HSA: attributes #2 = { nounwind "amdgpu-work-group-id-y" } +; HSA: attributes #3 = { nounwind "amdgpu-work-group-id-z" } +; HSA: attributes #4 = { nounwind "amdgpu-work-group-id-y" "amdgpu-work-group-id-z" } +; HSA: attributes #5 = { nounwind "amdgpu-work-item-id-y" } +; HSA: attributes #6 = { nounwind "amdgpu-work-item-id-z" } +; HSA: attributes #7 = { nounwind "amdgpu-work-group-id-y" "amdgpu-work-item-id-y" } +; HSA: attributes #8 = { nounwind "amdgpu-work-item-id-y" "amdgpu-work-item-id-z" } +; HSA: attributes #9 = { nounwind "amdgpu-work-group-id-y" "amdgpu-work-group-id-z" "amdgpu-work-item-id-y" "amdgpu-work-item-id-z" } +; HSA: attributes #10 = { nounwind "amdgpu-dispatch-ptr" }