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Re: Should -msse3 enable fisttp
- From: Evan Cheng <evan dot cheng at apple dot com>
- To: Evan Cheng <echeng at apple dot com>
- Cc: gcc at gcc dot gnu dot org
- Date: Mon, 3 Oct 2005 14:56:16 -0700
- Subject: Re: Should -msse3 enable fisttp
- References: <179A6816-4A60-4FC6-B9AE-CC920FBBC16A@apple.com>
My mistake. I misunderstood the meaning of -msse3 (it only enables
the sse3 builtins). Please ignore.
On Sep 29, 2005, at 1:48 PM, Evan Cheng wrote:
Hi,
I know this has been discussed in bug 18668. But I'd like to bring
it up again.
Currently, fisttp is only generated with -march=prescott. The
argument is fisttp is not a SSE instruction. While this is
technically true, it's likely to surprise the users. Intel, after
all, does lump fisttp in SSE3. AMD64 architecture programmer's
manual also explicitly state fisttp is a SSE3 instruction.
Please consider enabling fisttp with -msse3.
Thanks,
Evan
Evan Cheng
Senior Compiler Engineer
Apple Computer, Inc.