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

问题描述

是否(很容易)可以在 i386 linux 上使用软件浮点而不产生每次调用时陷入内核的费用?我试过 -msoft-float，但似乎普通(ubuntu)C 库没有包含 FP 库:

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

推荐答案

除非您想要手动引导整个工具链，否则您可以从 uclibc 工具链(我想是 i386 版本)——软浮点(AFAIK)不直接支持本机"编译debian 和衍生产品，但它可以通过 uclibc 工具链的嵌入式"方法使用.

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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