mirror of
https://github.com/ZDoom/qzdoom-gpl.git
synced 2024-12-11 12:51:27 +00:00
62 lines
2.6 KiB
C++
62 lines
2.6 KiB
C++
/*
|
|
** LLVM for loop branching
|
|
** Copyright (c) 2016 Magnus Norddahl
|
|
**
|
|
** This software is provided 'as-is', without any express or implied
|
|
** warranty. In no event will the authors be held liable for any damages
|
|
** arising from the use of this software.
|
|
**
|
|
** Permission is granted to anyone to use this software for any purpose,
|
|
** including commercial applications, and to alter it and redistribute it
|
|
** freely, subject to the following restrictions:
|
|
**
|
|
** 1. The origin of this software must not be misrepresented; you must not
|
|
** claim that you wrote the original software. If you use this software
|
|
** in a product, an acknowledgment in the product documentation would be
|
|
** appreciated but is not required.
|
|
** 2. Altered source versions must be plainly marked as such, and must not be
|
|
** misrepresented as being the original software.
|
|
** 3. This notice may not be removed or altered from any source distribution.
|
|
**
|
|
*/
|
|
|
|
#include "precomp.h"
|
|
#include "ssa_for_block.h"
|
|
#include "ssa_scope.h"
|
|
|
|
SSAForBlock::SSAForBlock()
|
|
: if_basic_block(0), loop_basic_block(0), end_basic_block(0)
|
|
{
|
|
if_basic_block = llvm::BasicBlock::Create(SSAScope::context(), "forbegin", SSAScope::builder().GetInsertBlock()->getParent());
|
|
loop_basic_block = llvm::BasicBlock::Create(SSAScope::context(), "forloop", SSAScope::builder().GetInsertBlock()->getParent());
|
|
end_basic_block = llvm::BasicBlock::Create(SSAScope::context(), "forend", SSAScope::builder().GetInsertBlock()->getParent());
|
|
SSAScope::builder().CreateBr(if_basic_block);
|
|
SSAScope::builder().SetInsertPoint(if_basic_block);
|
|
}
|
|
|
|
void SSAForBlock::loop_block(SSABool true_condition, int unroll_count)
|
|
{
|
|
auto branch = SSAScope::builder().CreateCondBr(true_condition.v, loop_basic_block, end_basic_block);
|
|
#if LLVM_VERSION_MAJOR > 3 || (LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 9)
|
|
if (unroll_count > 0)
|
|
{
|
|
using namespace llvm;
|
|
auto md_unroll_enable = MDNode::get(SSAScope::context(), {
|
|
MDString::get(SSAScope::context(), "llvm.loop.unroll.enable")
|
|
});
|
|
auto md_unroll_count = MDNode::get(SSAScope::context(), {
|
|
MDString::get(SSAScope::context(), "llvm.loop.unroll.count"),
|
|
ConstantAsMetadata::get(ConstantInt::get(SSAScope::context(), APInt(32, unroll_count)))
|
|
});
|
|
auto md_loop = MDNode::getDistinct(SSAScope::context(), { md_unroll_enable, md_unroll_count });
|
|
branch->setMetadata(LLVMContext::MD_loop, md_loop);
|
|
}
|
|
#endif
|
|
SSAScope::builder().SetInsertPoint(loop_basic_block);
|
|
}
|
|
|
|
void SSAForBlock::end_block()
|
|
{
|
|
SSAScope::builder().CreateBr(if_basic_block);
|
|
SSAScope::builder().SetInsertPoint(end_basic_block);
|
|
}
|