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Re: FLOATING-POINT CONSISTENCY, -FFLOAT-STORE, AND X86
- To: N8TM at aol dot com
- Subject: Re: FLOATING-POINT CONSISTENCY, -FFLOAT-STORE, AND X86
- From: Marc Lehmann <pcg at goof dot com>
- Date: Thu, 17 Dec 1998 21:35:23 +0100
- Cc: egcs at cygnus dot com
- References: <725f210d.3678d210@aol.com>
On Thu, Dec 17, 1998 at 04:42:40AM -0500, N8TM@aol.com wrote:
> IAW, how is 64 bit rounding mode going to be faster? For me, it seems this
> creates a similar situation to the float->integer conversion, i.e. save and
> restoring the control word with each assignment. >>
> Although I haven't seen anyone specify this, I assume they mean to leave
> 64-bit mode set throughout the program, or at least for the duration of any
This might break any third-party libraries and/or the system libm if it uses
extended precision to implement double-precision operations.
IAW, this functionality must be off by default, similar to -malign-double.
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