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GCC pipeline description have no effects
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彭建章
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Oct 29, 2009, 4:51:55 AM
10/29/09
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大家好,
我在port GCC,加了流水线描述,然后使用-mtune生成的汇编,和不用-mtune的结果一样。
并且我在mips3,loongson2f上测试的结果都是这样的。
为什么会这样呢?
Eric Fisher
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Oct 29, 2009, 4:55:46 AM
10/29/09
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似乎是有一个宏(或者代码)来控制是否使用你的描述,或者确认一下是否把描述包含进来。
2009/10/29 彭建章 <
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彭建章
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Oct 29, 2009, 5:06:42 AM
10/29/09
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我使用gcc 4.4 用loongson2f,也是没有效果的
两个优化选项如下
OPTIMIZE_PIPELINE=" -march=loongson2f -mtune=loongson2f"
OPTIMIZE_NOPIPELINE=" -march=loongson2f"
不知是不是我的优化参数不对
2009/10/29 Eric Fisher
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Eric Fisher
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Oct 29, 2009, 5:12:00 AM
10/29/09
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-O0?
你用-fdump-rtl-all-all打印中间文件,查看一下调度相关的那个文件,看看是用的什么描述信息。
2009/10/29 彭建章 <
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