Intel and GNU C++ compilers

Greg Lindahl lindahl at keyresearch.com
Mon Oct 13 15:26:55 EDT 2003


On Mon, Oct 13, 2003 at 12:04:47PM -0400, Mark Hahn wrote:

> -fomit-frame-pointer usually helps, sometimes noticably,
> since x86 is so short of registers.

Actually it's a lot more of a tossup than it used to be: having a
frame pointer means you have another 256 bytes accessible via a
single-byte offset, and the SSE registers help relieve the register
pressure problem.

On the Opteron, which has more of both general purpose and SSE
registers, the frame pointer is often a win.

-- greg

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