On Mon, Apr 22, 2002 at 04:48:22PM +0100, Richard Earnshaw wrote:
> Dump of assembler code for function FontCouldBeTerminal:
> 0x10f7c>: stmdb   sp!, {r4, r5, r6, r7, lr}
> 0x10f80>: sub     sp, sp, #4      ; 0x4
...
> 0x11028>: mov     r0, #0  ; 0x0
            add     sp, sp, #4
> 0x1102c>: ldmia   sp!, {r4, r5, r6, r7, pc}

Isn't is likely to be faster to align the stack by ensuring
that an even number of registers are saved/restored, rather
than having 2 extra instructions to modify the sp?

The single stack location is more likely to be in the
D-cache than the two instructions are in the I-cache.

	David

-- 
David Laight: david@l8s.co.uk