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https://github.com/c64scene-ar/llvm-6502.git
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49135bb76c
An optional third field was added to `llvm.global_ctors` (and `llvm.global_dtors`) in r209015. Most of the code has been changed to deal with both versions of the variables. Users of the C API might create either version, the helper functions in LLVM create the two-field version, and clang now creates the three-field version. However, the BitcodeReader was changed to always upgrade to the three-field version. This created an unnecessary inconsistency in the IR before/after serializing to bitcode. This commit resolves the inconsistency by making the third field truly optional (and not upgrading in the bitcode reader). Since `llvm-link` was relying on this upgrade code, rather than deleting it I've moved it into `ModuleLinker`, where it upgrades these arrays as necessary to resolve inconsistencies between modules. The ideal resolution would be to remove the 2-field version and make the third field required. I filed PR20506 to track that. I changed `test/Bitcode/upgrade-global-ctors.ll` to a negative test and duplicated the `llvm-link` check in `test/Linker/global_ctors.ll` to check both upgrade directions. Since I came across this as part of PR5680 (serializing use-list order), I've also added the missing `verify-uselistorder` RUN line to `test/Bitcode/metadata-2.ll`. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215457 91177308-0d34-0410-b5e6-96231b3b80d8
534 lines
19 KiB
C++
534 lines
19 KiB
C++
//===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the auto-upgrade helper functions
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/AutoUpgrade.h"
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#include "llvm/IR/CFG.h"
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#include "llvm/IR/CallSite.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cstring>
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using namespace llvm;
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// Upgrade the declarations of the SSE4.1 functions whose arguments have
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// changed their type from v4f32 to v2i64.
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static bool UpgradeSSE41Function(Function* F, Intrinsic::ID IID,
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Function *&NewFn) {
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// Check whether this is an old version of the function, which received
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// v4f32 arguments.
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Type *Arg0Type = F->getFunctionType()->getParamType(0);
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if (Arg0Type != VectorType::get(Type::getFloatTy(F->getContext()), 4))
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return false;
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// Yes, it's old, replace it with new version.
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F->setName(F->getName() + ".old");
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NewFn = Intrinsic::getDeclaration(F->getParent(), IID);
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return true;
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}
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static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
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assert(F && "Illegal to upgrade a non-existent Function.");
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// Quickly eliminate it, if it's not a candidate.
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StringRef Name = F->getName();
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if (Name.size() <= 8 || !Name.startswith("llvm."))
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return false;
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Name = Name.substr(5); // Strip off "llvm."
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switch (Name[0]) {
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default: break;
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case 'a': {
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if (Name.startswith("arm.neon.vclz")) {
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Type* args[2] = {
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F->arg_begin()->getType(),
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Type::getInt1Ty(F->getContext())
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};
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// Can't use Intrinsic::getDeclaration here as it adds a ".i1" to
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// the end of the name. Change name from llvm.arm.neon.vclz.* to
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// llvm.ctlz.*
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FunctionType* fType = FunctionType::get(F->getReturnType(), args, false);
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NewFn = Function::Create(fType, F->getLinkage(),
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"llvm.ctlz." + Name.substr(14), F->getParent());
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return true;
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}
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if (Name.startswith("arm.neon.vcnt")) {
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NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctpop,
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F->arg_begin()->getType());
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return true;
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}
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break;
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}
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case 'c': {
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if (Name.startswith("ctlz.") && F->arg_size() == 1) {
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F->setName(Name + ".old");
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NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctlz,
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F->arg_begin()->getType());
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return true;
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}
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if (Name.startswith("cttz.") && F->arg_size() == 1) {
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F->setName(Name + ".old");
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NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::cttz,
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F->arg_begin()->getType());
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return true;
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}
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break;
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}
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case 'o':
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// We only need to change the name to match the mangling including the
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// address space.
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if (F->arg_size() == 2 && Name.startswith("objectsize.")) {
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Type *Tys[2] = { F->getReturnType(), F->arg_begin()->getType() };
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if (F->getName() != Intrinsic::getName(Intrinsic::objectsize, Tys)) {
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F->setName(Name + ".old");
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NewFn = Intrinsic::getDeclaration(F->getParent(),
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Intrinsic::objectsize, Tys);
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return true;
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}
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}
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break;
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case 'x': {
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if (Name.startswith("x86.sse2.pcmpeq.") ||
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Name.startswith("x86.sse2.pcmpgt.") ||
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Name.startswith("x86.avx2.pcmpeq.") ||
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Name.startswith("x86.avx2.pcmpgt.") ||
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Name.startswith("x86.avx.vpermil.") ||
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Name == "x86.avx.movnt.dq.256" ||
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Name == "x86.avx.movnt.pd.256" ||
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Name == "x86.avx.movnt.ps.256" ||
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Name == "x86.sse42.crc32.64.8" ||
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Name == "x86.avx.vbroadcast.ss" ||
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Name == "x86.avx.vbroadcast.ss.256" ||
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Name == "x86.avx.vbroadcast.sd.256" ||
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(Name.startswith("x86.xop.vpcom") && F->arg_size() == 2)) {
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NewFn = nullptr;
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return true;
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}
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// SSE4.1 ptest functions may have an old signature.
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if (Name.startswith("x86.sse41.ptest")) {
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if (Name == "x86.sse41.ptestc")
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return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestc, NewFn);
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if (Name == "x86.sse41.ptestz")
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return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestz, NewFn);
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if (Name == "x86.sse41.ptestnzc")
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return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestnzc, NewFn);
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}
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// frcz.ss/sd may need to have an argument dropped
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if (Name.startswith("x86.xop.vfrcz.ss") && F->arg_size() == 2) {
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F->setName(Name + ".old");
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NewFn = Intrinsic::getDeclaration(F->getParent(),
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Intrinsic::x86_xop_vfrcz_ss);
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return true;
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}
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if (Name.startswith("x86.xop.vfrcz.sd") && F->arg_size() == 2) {
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F->setName(Name + ".old");
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NewFn = Intrinsic::getDeclaration(F->getParent(),
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Intrinsic::x86_xop_vfrcz_sd);
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return true;
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}
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// Fix the FMA4 intrinsics to remove the 4
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if (Name.startswith("x86.fma4.")) {
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F->setName("llvm.x86.fma" + Name.substr(8));
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NewFn = F;
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return true;
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}
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break;
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}
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}
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// This may not belong here. This function is effectively being overloaded
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// to both detect an intrinsic which needs upgrading, and to provide the
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// upgraded form of the intrinsic. We should perhaps have two separate
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// functions for this.
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return false;
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}
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bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
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NewFn = nullptr;
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bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn);
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// Upgrade intrinsic attributes. This does not change the function.
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if (NewFn)
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F = NewFn;
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if (unsigned id = F->getIntrinsicID())
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F->setAttributes(Intrinsic::getAttributes(F->getContext(),
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(Intrinsic::ID)id));
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return Upgraded;
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}
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bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
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// Nothing to do yet.
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return false;
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}
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// UpgradeIntrinsicCall - Upgrade a call to an old intrinsic to be a call the
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// upgraded intrinsic. All argument and return casting must be provided in
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// order to seamlessly integrate with existing context.
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void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
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Function *F = CI->getCalledFunction();
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LLVMContext &C = CI->getContext();
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IRBuilder<> Builder(C);
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Builder.SetInsertPoint(CI->getParent(), CI);
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assert(F && "Intrinsic call is not direct?");
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if (!NewFn) {
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// Get the Function's name.
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StringRef Name = F->getName();
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Value *Rep;
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// Upgrade packed integer vector compares intrinsics to compare instructions
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if (Name.startswith("llvm.x86.sse2.pcmpeq.") ||
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Name.startswith("llvm.x86.avx2.pcmpeq.")) {
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Rep = Builder.CreateICmpEQ(CI->getArgOperand(0), CI->getArgOperand(1),
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"pcmpeq");
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// need to sign extend since icmp returns vector of i1
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Rep = Builder.CreateSExt(Rep, CI->getType(), "");
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} else if (Name.startswith("llvm.x86.sse2.pcmpgt.") ||
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Name.startswith("llvm.x86.avx2.pcmpgt.")) {
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Rep = Builder.CreateICmpSGT(CI->getArgOperand(0), CI->getArgOperand(1),
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"pcmpgt");
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// need to sign extend since icmp returns vector of i1
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Rep = Builder.CreateSExt(Rep, CI->getType(), "");
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} else if (Name == "llvm.x86.avx.movnt.dq.256" ||
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Name == "llvm.x86.avx.movnt.ps.256" ||
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Name == "llvm.x86.avx.movnt.pd.256") {
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IRBuilder<> Builder(C);
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Builder.SetInsertPoint(CI->getParent(), CI);
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Module *M = F->getParent();
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SmallVector<Value *, 1> Elts;
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Elts.push_back(ConstantInt::get(Type::getInt32Ty(C), 1));
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MDNode *Node = MDNode::get(C, Elts);
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Value *Arg0 = CI->getArgOperand(0);
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Value *Arg1 = CI->getArgOperand(1);
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// Convert the type of the pointer to a pointer to the stored type.
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Value *BC = Builder.CreateBitCast(Arg0,
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PointerType::getUnqual(Arg1->getType()),
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"cast");
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StoreInst *SI = Builder.CreateStore(Arg1, BC);
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SI->setMetadata(M->getMDKindID("nontemporal"), Node);
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SI->setAlignment(16);
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// Remove intrinsic.
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CI->eraseFromParent();
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return;
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} else if (Name.startswith("llvm.x86.xop.vpcom")) {
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Intrinsic::ID intID;
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if (Name.endswith("ub"))
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intID = Intrinsic::x86_xop_vpcomub;
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else if (Name.endswith("uw"))
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intID = Intrinsic::x86_xop_vpcomuw;
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else if (Name.endswith("ud"))
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intID = Intrinsic::x86_xop_vpcomud;
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else if (Name.endswith("uq"))
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intID = Intrinsic::x86_xop_vpcomuq;
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else if (Name.endswith("b"))
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intID = Intrinsic::x86_xop_vpcomb;
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else if (Name.endswith("w"))
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intID = Intrinsic::x86_xop_vpcomw;
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else if (Name.endswith("d"))
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intID = Intrinsic::x86_xop_vpcomd;
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else if (Name.endswith("q"))
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intID = Intrinsic::x86_xop_vpcomq;
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else
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llvm_unreachable("Unknown suffix");
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Name = Name.substr(18); // strip off "llvm.x86.xop.vpcom"
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unsigned Imm;
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if (Name.startswith("lt"))
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Imm = 0;
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else if (Name.startswith("le"))
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Imm = 1;
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else if (Name.startswith("gt"))
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Imm = 2;
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else if (Name.startswith("ge"))
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Imm = 3;
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else if (Name.startswith("eq"))
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Imm = 4;
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else if (Name.startswith("ne"))
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Imm = 5;
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else if (Name.startswith("true"))
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Imm = 6;
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else if (Name.startswith("false"))
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Imm = 7;
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else
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llvm_unreachable("Unknown condition");
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Function *VPCOM = Intrinsic::getDeclaration(F->getParent(), intID);
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Rep = Builder.CreateCall3(VPCOM, CI->getArgOperand(0),
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CI->getArgOperand(1), Builder.getInt8(Imm));
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} else if (Name == "llvm.x86.sse42.crc32.64.8") {
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Function *CRC32 = Intrinsic::getDeclaration(F->getParent(),
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Intrinsic::x86_sse42_crc32_32_8);
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Value *Trunc0 = Builder.CreateTrunc(CI->getArgOperand(0), Type::getInt32Ty(C));
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Rep = Builder.CreateCall2(CRC32, Trunc0, CI->getArgOperand(1));
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Rep = Builder.CreateZExt(Rep, CI->getType(), "");
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} else if (Name.startswith("llvm.x86.avx.vbroadcast")) {
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// Replace broadcasts with a series of insertelements.
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Type *VecTy = CI->getType();
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Type *EltTy = VecTy->getVectorElementType();
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unsigned EltNum = VecTy->getVectorNumElements();
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Value *Cast = Builder.CreateBitCast(CI->getArgOperand(0),
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EltTy->getPointerTo());
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Value *Load = Builder.CreateLoad(Cast);
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Type *I32Ty = Type::getInt32Ty(C);
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Rep = UndefValue::get(VecTy);
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for (unsigned I = 0; I < EltNum; ++I)
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Rep = Builder.CreateInsertElement(Rep, Load,
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ConstantInt::get(I32Ty, I));
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} else {
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bool PD128 = false, PD256 = false, PS128 = false, PS256 = false;
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if (Name == "llvm.x86.avx.vpermil.pd.256")
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PD256 = true;
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else if (Name == "llvm.x86.avx.vpermil.pd")
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PD128 = true;
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else if (Name == "llvm.x86.avx.vpermil.ps.256")
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PS256 = true;
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else if (Name == "llvm.x86.avx.vpermil.ps")
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PS128 = true;
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if (PD256 || PD128 || PS256 || PS128) {
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Value *Op0 = CI->getArgOperand(0);
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unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
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SmallVector<Constant*, 8> Idxs;
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if (PD128)
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for (unsigned i = 0; i != 2; ++i)
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Idxs.push_back(Builder.getInt32((Imm >> i) & 0x1));
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else if (PD256)
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for (unsigned l = 0; l != 4; l+=2)
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for (unsigned i = 0; i != 2; ++i)
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Idxs.push_back(Builder.getInt32(((Imm >> (l+i)) & 0x1) + l));
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else if (PS128)
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for (unsigned i = 0; i != 4; ++i)
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Idxs.push_back(Builder.getInt32((Imm >> (2 * i)) & 0x3));
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else if (PS256)
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for (unsigned l = 0; l != 8; l+=4)
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for (unsigned i = 0; i != 4; ++i)
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Idxs.push_back(Builder.getInt32(((Imm >> (2 * i)) & 0x3) + l));
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else
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llvm_unreachable("Unexpected function");
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Rep = Builder.CreateShuffleVector(Op0, Op0, ConstantVector::get(Idxs));
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} else {
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llvm_unreachable("Unknown function for CallInst upgrade.");
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}
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}
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CI->replaceAllUsesWith(Rep);
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CI->eraseFromParent();
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return;
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}
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std::string Name = CI->getName().str();
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CI->setName(Name + ".old");
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switch (NewFn->getIntrinsicID()) {
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default:
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llvm_unreachable("Unknown function for CallInst upgrade.");
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case Intrinsic::ctlz:
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case Intrinsic::cttz:
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assert(CI->getNumArgOperands() == 1 &&
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"Mismatch between function args and call args");
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CI->replaceAllUsesWith(Builder.CreateCall2(NewFn, CI->getArgOperand(0),
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Builder.getFalse(), Name));
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CI->eraseFromParent();
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return;
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case Intrinsic::objectsize:
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CI->replaceAllUsesWith(Builder.CreateCall2(NewFn,
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CI->getArgOperand(0),
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CI->getArgOperand(1),
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Name));
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CI->eraseFromParent();
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return;
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case Intrinsic::arm_neon_vclz: {
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// Change name from llvm.arm.neon.vclz.* to llvm.ctlz.*
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CI->replaceAllUsesWith(Builder.CreateCall2(NewFn, CI->getArgOperand(0),
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Builder.getFalse(),
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"llvm.ctlz." + Name.substr(14)));
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CI->eraseFromParent();
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return;
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}
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case Intrinsic::ctpop: {
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CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(0)));
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CI->eraseFromParent();
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return;
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}
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case Intrinsic::x86_xop_vfrcz_ss:
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case Intrinsic::x86_xop_vfrcz_sd:
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CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(1),
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Name));
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CI->eraseFromParent();
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return;
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case Intrinsic::x86_sse41_ptestc:
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case Intrinsic::x86_sse41_ptestz:
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case Intrinsic::x86_sse41_ptestnzc: {
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// The arguments for these intrinsics used to be v4f32, and changed
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// to v2i64. This is purely a nop, since those are bitwise intrinsics.
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// So, the only thing required is a bitcast for both arguments.
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// First, check the arguments have the old type.
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Value *Arg0 = CI->getArgOperand(0);
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if (Arg0->getType() != VectorType::get(Type::getFloatTy(C), 4))
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return;
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// Old intrinsic, add bitcasts
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Value *Arg1 = CI->getArgOperand(1);
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Value *BC0 =
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Builder.CreateBitCast(Arg0,
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VectorType::get(Type::getInt64Ty(C), 2),
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"cast");
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Value *BC1 =
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Builder.CreateBitCast(Arg1,
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VectorType::get(Type::getInt64Ty(C), 2),
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"cast");
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CallInst* NewCall = Builder.CreateCall2(NewFn, BC0, BC1, Name);
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CI->replaceAllUsesWith(NewCall);
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CI->eraseFromParent();
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return;
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}
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}
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}
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// This tests each Function to determine if it needs upgrading. When we find
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// one we are interested in, we then upgrade all calls to reflect the new
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// function.
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void llvm::UpgradeCallsToIntrinsic(Function* F) {
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assert(F && "Illegal attempt to upgrade a non-existent intrinsic.");
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// Upgrade the function and check if it is a totaly new function.
|
|
Function *NewFn;
|
|
if (UpgradeIntrinsicFunction(F, NewFn)) {
|
|
if (NewFn != F) {
|
|
// Replace all uses to the old function with the new one if necessary.
|
|
for (Value::user_iterator UI = F->user_begin(), UE = F->user_end();
|
|
UI != UE; ) {
|
|
if (CallInst *CI = dyn_cast<CallInst>(*UI++))
|
|
UpgradeIntrinsicCall(CI, NewFn);
|
|
}
|
|
// Remove old function, no longer used, from the module.
|
|
F->eraseFromParent();
|
|
}
|
|
}
|
|
}
|
|
|
|
void llvm::UpgradeInstWithTBAATag(Instruction *I) {
|
|
MDNode *MD = I->getMetadata(LLVMContext::MD_tbaa);
|
|
assert(MD && "UpgradeInstWithTBAATag should have a TBAA tag");
|
|
// Check if the tag uses struct-path aware TBAA format.
|
|
if (isa<MDNode>(MD->getOperand(0)) && MD->getNumOperands() >= 3)
|
|
return;
|
|
|
|
if (MD->getNumOperands() == 3) {
|
|
Value *Elts[] = {
|
|
MD->getOperand(0),
|
|
MD->getOperand(1)
|
|
};
|
|
MDNode *ScalarType = MDNode::get(I->getContext(), Elts);
|
|
// Create a MDNode <ScalarType, ScalarType, offset 0, const>
|
|
Value *Elts2[] = {
|
|
ScalarType, ScalarType,
|
|
Constant::getNullValue(Type::getInt64Ty(I->getContext())),
|
|
MD->getOperand(2)
|
|
};
|
|
I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts2));
|
|
} else {
|
|
// Create a MDNode <MD, MD, offset 0>
|
|
Value *Elts[] = {MD, MD,
|
|
Constant::getNullValue(Type::getInt64Ty(I->getContext()))};
|
|
I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts));
|
|
}
|
|
}
|
|
|
|
Instruction *llvm::UpgradeBitCastInst(unsigned Opc, Value *V, Type *DestTy,
|
|
Instruction *&Temp) {
|
|
if (Opc != Instruction::BitCast)
|
|
return nullptr;
|
|
|
|
Temp = nullptr;
|
|
Type *SrcTy = V->getType();
|
|
if (SrcTy->isPtrOrPtrVectorTy() && DestTy->isPtrOrPtrVectorTy() &&
|
|
SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace()) {
|
|
LLVMContext &Context = V->getContext();
|
|
|
|
// We have no information about target data layout, so we assume that
|
|
// the maximum pointer size is 64bit.
|
|
Type *MidTy = Type::getInt64Ty(Context);
|
|
Temp = CastInst::Create(Instruction::PtrToInt, V, MidTy);
|
|
|
|
return CastInst::Create(Instruction::IntToPtr, Temp, DestTy);
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
Value *llvm::UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy) {
|
|
if (Opc != Instruction::BitCast)
|
|
return nullptr;
|
|
|
|
Type *SrcTy = C->getType();
|
|
if (SrcTy->isPtrOrPtrVectorTy() && DestTy->isPtrOrPtrVectorTy() &&
|
|
SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace()) {
|
|
LLVMContext &Context = C->getContext();
|
|
|
|
// We have no information about target data layout, so we assume that
|
|
// the maximum pointer size is 64bit.
|
|
Type *MidTy = Type::getInt64Ty(Context);
|
|
|
|
return ConstantExpr::getIntToPtr(ConstantExpr::getPtrToInt(C, MidTy),
|
|
DestTy);
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
/// Check the debug info version number, if it is out-dated, drop the debug
|
|
/// info. Return true if module is modified.
|
|
bool llvm::UpgradeDebugInfo(Module &M) {
|
|
unsigned Version = getDebugMetadataVersionFromModule(M);
|
|
if (Version == DEBUG_METADATA_VERSION)
|
|
return false;
|
|
|
|
bool RetCode = StripDebugInfo(M);
|
|
if (RetCode) {
|
|
DiagnosticInfoDebugMetadataVersion DiagVersion(M, Version);
|
|
M.getContext().diagnose(DiagVersion);
|
|
}
|
|
return RetCode;
|
|
}
|
|
|
|
void llvm::UpgradeMDStringConstant(std::string &String) {
|
|
const std::string OldPrefix = "llvm.vectorizer.";
|
|
if (String == "llvm.vectorizer.unroll") {
|
|
String = "llvm.loop.interleave.count";
|
|
} else if (String.find(OldPrefix) == 0) {
|
|
String.replace(0, OldPrefix.size(), "llvm.loop.vectorize.");
|
|
}
|
|
}
|