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CQ37334

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当我们用CGT6.0.26编译此程序时,在.asm文件, 我们可以看到的是第一个循环被软件流水。第二个 是"Disqualified loop Did not find partition".

这是一个性能问题,而不是一个正确性的问题。

此问题是由在软件流水后选择最优的软件流水结果 时出的问题。软件流水通常对一个循环作出了几个 软件流水的结果, 在最后时刻将挑选最好的。问题 发生在软件流水在选择结果时包括了失败的软件流水 结果, 并且根据这个失败的结果的信息选择了它。 改正就是选择一定要在成功的流水线结果之中进行。

更进一步,很难说什么时候会出现这种情况。这通常 发生在C64+上。 在C64+上,成功和失败的软件流水 结果会被混合在一起。在这种情况下,如果软件流水 选择错误,就会造成性能变坏。

缺陷发生在:

C6000的编译器版本:6.0.26 - 6.0.27,6.1.0B1 - 6.1.16,7.0.0B1 - 7.0.3,7.1.0B1 - 7.1.0B2

E2e.jpg {{
  1. switchcategory:MultiCore=
  • For technical support on MultiCore devices, please post your questions in the C6000 MultiCore Forum
  • For questions related to the BIOS MultiCore SDK (MCSDK), please use the BIOS Forum

Please post only comments related to the article CQ37334 here.

Keystone=
  • For technical support on MultiCore devices, please post your questions in the C6000 MultiCore Forum
  • For questions related to the BIOS MultiCore SDK (MCSDK), please use the BIOS Forum

Please post only comments related to the article CQ37334 here.

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