一旦您调用未定义的行为,所有的赌注都是无效的。使用-funsafe-loop-optimizations尝试godbolt示例可以很好地说明这一点,我们可以看到gcc将其转换为一个什么也不做的无限循环。还可以参见这个和这个。- Shafik Yaghmour 3 不是gcc导致你的代码出错,而是你的代码本身有问题,在使用gcc进行优化时就会显现出来。- too hon...
In response, this study introduces a method leveraging the XGBoost algorithm to predict the optimal loop unrolling factor for compiler optimization, thereby aiming to replace human thinking with machine learning methods and standardize development processes. Initially, the study gathers data on the loop ...
Clang会自动展开循环，如果你在original_loop()中添加#pragma GCC unroll 16，GCC也会生成类似的代码：h...
Profile-guided optimizationCompilers do performance optimizations by using known heuristics, making most probable guesses about code execution. For example, a compiler may decide the branch to take based on where is it located in a loop, and it may choose to inline a function based on its size...
{"loop", "use loop filter", 0, AV_OPT_TYPE_CONST, {.i64 = CODEC_FLAG_LOOP_FILTER }, INT_MIN, INT_MAX, V|E, "flags"}, {"qscale", "use fixed qscale", 0, AV_OPT_TYPE_CONST, {.i64 = CODEC_FLAG_QSCALE }, INT_MIN, INT_MAX, 0, "flags"}, ...
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The New Framework for Loop Nest Optimization in GCC: from Prototyping to Evaluation - POP, COHEN, et al. - 2006 () Citation Context ...een done to make the model be able to handle real-life programs in real-life compilers [7, 21], and the method we propose aims at being integrated...