scop是在编译期就能确定的control flow与memory access,是对region的进一步约束,以便对loop进行分析、变换。 scop是仅含有for loop与if条件的control flow。每个loop中仅有一个整型的induction variable,以相同的stride从loop的上界递增到… 阅读全文 赞同 ...
dependence analysis 算作多面体编译内部的分析 我们知道多面体编译作用于循环for (i=lb; i<ub; i+=stride),而LLVM是三地址码的,在LLVM上做多面体优化并不是直接的。对于上述5个需求,llvm[1]: llvm 是 typed IR llvm 上有通用的loop analysis;llvm 中用scop detection pass去找可以做多面体优化的region(CFG子...
After auditing LoopVectorize, it was found that it was using LoopInfo::isLoopInvariant in several places, skipping the more powerful SCEV isLoopInvariant check. LoopVectorizationLegality already has a routine called isInvariant, which in turn calls into LoopAccessAnalysis. Fix a deficiency in LAA...
Files with mismatching mtime's are considered valid if both contents is identical -fveclib=<value> Use the given vector functions library -fvectorize Enable the loop vectorization passes -fvisibility-global-new-delete-hidden Give global C++ operator new and delete declarations hidden visibility -fvisi...
过程间优化(IPO目录):无效参数消除(DeadArgumentElimination.cpp[code]) , 全局死代码消除(GlobalDCE.cpp[code]), 常量传播(IPConstantPropagation.cpp[code]), 循环外提(LoopExtractor.cpp[code]),稀疏条件常量传播(SCCP.cpp[code]),函数合并(MergeFunctions.cpp[code])等 ...
Analysis/LoopAccessAnalysis.h /usr/include/llvm-18/llvm/Analysis/LoopAnalysisManager.h /usr/include/llvm-18/llvm/Analysis/LoopCacheAnalysis.h /usr/include/llvm-18/llvm/Analysis/LoopInfo.h /usr/include/llvm-18/llvm/Analysis/LoopIterator.h /usr/include/llvm-18/llvm/Analysis/LoopNestAnalysis.h /...
过程间优化(IPO目录):无效参数消除(DeadArgumentElimination.cpp[code]) , 全局死代码消除(GlobalDCE.cpp[code]), 常量传播(IPConstantPropagation.cpp[code]), 循环外提(LoopExtractor.cpp[code...
在LLVM整体架构,前端用的是clang,广义的LLVM是指整个LLVM架构,一般狭义的LLVM指的是LLVM后端(包含代码优化和目标代码生成),在iOS的构建中,一般把clang作为编译器的前端,LLVM作为后端,负责优化代码,生成不同的平台的目标代码。 e工作流程: 1.目标代码经过clang,进行词法,语法分析,语议分析,生成出版的中间代码 ...
we can’t efficiently access analyses to arbitrary functions.For a function analysis, the corresponding analysis pass will only contain the info for the current function, which is created during the latest run of the analysis pass. We can manually create analyses for other functions, but they won...
(modified) llvm/lib/Analysis/LoopAccessAnalysis.cpp (+35-37) (modified) llvm/test/Analysis/LoopAccessAnalysis/forward-loop-carried.ll (-4) (modified) llvm/test/Analysis/LoopAccessAnalysis/stride-access-dependence.ll (+5-33) diff --git a/llvm/include/llvm/Analysis/LoopAccessAnalysis.h b/llvm...