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Re: GCC's -ffast-math behavior
- From: Andrew Haley <aph at redhat dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Thu, 09 Feb 2012 09:21:20 +0000
- Subject: Re: GCC's -ffast-math behavior
- References: <4F3384CD.7090708@gmail.com>
On 02/09/2012 08:33 AM, xunxun wrote:
> When using -ffast-math, gcc don't generate the math function
> symbol: U _exp
No, it doesn't. Instead gcc uses the F2XM1 instruction. Why would
you want to call a library when gcc has an instruction to do the
job?
Andrew.