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62 lines
2.6 KiB
C++
62 lines
2.6 KiB
C++
/*
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** LLVM for loop branching
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** Copyright (c) 2016 Magnus Norddahl
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any damages
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** arising from the use of this software.
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**
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** Permission is granted to anyone to use this software for any purpose,
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** including commercial applications, and to alter it and redistribute it
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** freely, subject to the following restrictions:
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**
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** 1. The origin of this software must not be misrepresented; you must not
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** claim that you wrote the original software. If you use this software
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** in a product, an acknowledgment in the product documentation would be
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** appreciated but is not required.
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** 2. Altered source versions must be plainly marked as such, and must not be
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** misrepresented as being the original software.
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** 3. This notice may not be removed or altered from any source distribution.
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**
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*/
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#include "precomp.h"
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#include "ssa_for_block.h"
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#include "ssa_scope.h"
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SSAForBlock::SSAForBlock()
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: if_basic_block(0), loop_basic_block(0), end_basic_block(0)
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{
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if_basic_block = llvm::BasicBlock::Create(SSAScope::context(), "forbegin", SSAScope::builder().GetInsertBlock()->getParent());
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loop_basic_block = llvm::BasicBlock::Create(SSAScope::context(), "forloop", SSAScope::builder().GetInsertBlock()->getParent());
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end_basic_block = llvm::BasicBlock::Create(SSAScope::context(), "forend", SSAScope::builder().GetInsertBlock()->getParent());
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SSAScope::builder().CreateBr(if_basic_block);
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SSAScope::builder().SetInsertPoint(if_basic_block);
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}
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void SSAForBlock::loop_block(SSABool true_condition, int unroll_count)
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{
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auto branch = SSAScope::builder().CreateCondBr(true_condition.v, loop_basic_block, end_basic_block);
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#if LLVM_VERSION_MAJOR > 3 || (LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 9)
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if (unroll_count > 0)
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{
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using namespace llvm;
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auto md_unroll_enable = MDNode::get(SSAScope::context(), {
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MDString::get(SSAScope::context(), "llvm.loop.unroll.enable")
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});
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auto md_unroll_count = MDNode::get(SSAScope::context(), {
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MDString::get(SSAScope::context(), "llvm.loop.unroll.count"),
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ConstantAsMetadata::get(ConstantInt::get(SSAScope::context(), APInt(32, unroll_count)))
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});
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auto md_loop = MDNode::getDistinct(SSAScope::context(), { md_unroll_enable, md_unroll_count });
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branch->setMetadata(LLVMContext::MD_loop, md_loop);
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}
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#endif
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SSAScope::builder().SetInsertPoint(loop_basic_block);
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}
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void SSAForBlock::end_block()
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{
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SSAScope::builder().CreateBr(if_basic_block);
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SSAScope::builder().SetInsertPoint(end_basic_block);
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}
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