在x86 linux上使用软件浮点 [英] Using software floating point on x86 linux

问题描述

在i386 linux上使用软件浮点（很容易）是否可能，而不会导致在每次调用时陷入内核的开销？我已经尝试了-msoft-float，但是看起来正常的（ubuntu）C库没有包含FP库：

  $ gcc -m32 -msoft-float -lm -o test test.c 
 /tmp/cc8RXn8F.o：在函数`main'中：
 test.c :( .text + 0x39）：未定义引用`__muldf3'
 collect2：ld返回1退出状态
  

解决方案

除非你想手动引导你的整个工具链，否则你可以从

Is it (easily) possible to use software floating point on i386 linux without incurring the expense of trapping into the kernel on each call? I've tried -msoft-float, but it seems the normal (ubuntu) C libraries don't have a FP library included:

$ gcc -m32 -msoft-float -lm -o test test.c
/tmp/cc8RXn8F.o: In function `main':
test.c:(.text+0x39): undefined reference to `__muldf3'
collect2: ld returned 1 exit status

解决方案

Unless you want to bootstrap your entire toolchain by hand, you could start with uclibc toolchain (the i386 version, I imagine) -- soft float is (AFAIK) not directly supported for "native" compilation on debian and derivatives, but it can be used via the "embedded" approach of the uclibc toolchain.

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