unroll添加了unroll标签的for循环是可以展开的,直到循环条件终止,代价是产生更多机器码 loop添加了loop标签的for循环不能展开,流式控制每次的循环迭代,for默认是loop 在我理解的话,branch和loop更像是动态的,而flatten和unroll倾向于静态的,从UE4的代码中loop经常搭配branch,而unroll经常搭配flatten也可以看出来。 还有一...
看UE4的Shader代码的时候经常会看到if语句之前会有branch,flatten关键词,而for循环前面会有unroll,loop这样的关键词,比如如下代码: UNROLL for (uint k = 0; k < Radius; k++) { float BucketDistance = fRadiusMultiplier * (float(k + 1) * COC_TILE_SIZE) - COC_TILE_SIZE FLATTEN if (-OutSampleBu...
优化1:unroll 3rd loop(展开最里层的循环)1 2 3 4 5 6 Replace for (int k = 0; k <= z; k++) { if (n == 5*i + 2*j + k) res++; } by the following:if (n - 5*i - 2*j >= 0) res++; 优化2:remove if(移除if判断)...
unable to unroll loop, loop does not appear to terminate in a timely manner (1024 iterations) 原本代码 for (int i = 0; i < _Loops; i++) 这里的_Loops是运行时,有程序传入的参数,在编译时报错 改写为字面值的最大值 for (int i = 0; i < 50; i++) { ... ... if (i >= _Loop...
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The epilog loop created by the loop unroller may not be run if the main unrolled loop covers all original loop iterations, thus pipelining it non-speculatively may not be beneficial. It can also ca...
When building with-Oz, consuming profiles can drastically increase binary size. We found-loop-unroll-use-branch-weights=falsecan give us a 1.6% text size win when profiles are used, which mitigates some of this regression. Full diff:https://github.com/llvm/llvm-project/pull/102950.diff ...
coder.loop.unrollAndJam("loopID",unrollFactor)prompts the code generator to unroll and jam the loop with index nameloopIDby a factor specified byunrollFactorin the generated code. Unroll and jam transforms are usually applied to perfectly nested loops, which are loops where all data elements ar...
ARM_MATH_LOOPUNROLL:用于4个为一组的的小批量处理上，加快执行速度。通过下面的求绝对值函数，可以方便...
1.GC常用参数 -Xmn -Xms -Xmx -Xss 年轻代 最小堆 最大堆 栈空间 -XX:+UseTLAB 使用TLAB，默认...