crosstool-ng: cross compiler for -mach=arm4vt (Cirrus Logic EP93xx target)
Khem Raj
raj.khem@gmail.com
Sat Sep 12 20:18:00 GMT 2009
On (11/09/09 23:20), Martin Guy wrote:
> On 9/11/09, ng@piments.com <ng@piments.com> wrote:
> > I see you're posting patch sets for 4.2 and 4.3. I recall you said
> > somewhere that 4.2.x produced faster ARM code. Is that still your
> > experience?
>
> THere's some extra measurements I didn't post there: using differen
> GCCs to compile gcc-4.3.4, and measuring the size of the different
> GCCs themselves and the size of the object code they generate and the
> maximum memory they use to do it (compiling insn_recog.c as a rule):
>
> --the compiler itself-- --on gcc-4.3.2 stage1--
> Version gcc cc1 cc1 Elapsed Max VM xgcc
> text text data time used text
> gcc-3.4 79579 3862155 3236 4m30 104128 209509
> gcc-4.0 86429 4579965 10208 4m44 111104 225846
> gcc-4.1 193369 5115620 15976 4m56 123264 226469
> gcc-4.2 188582 5490547 17364 4m50 112128 221171
> gcc-4.3 203918* 7010746 420820 6m41 157440 227755
> gcc-4.4 202989* 9431805 546128 8m21 170550 249260
> llvm4.2 189365 4m56 67136 236957
Did you compile exact same insn_recog.c source ?
if not then you are comparing apples to pineapples.
-Khem
>
> so 4.2 shows an unexpected dip in its own size, its memory use, the
> time it takes to run and the size of its output code.
> (Maybe it was just gathering its strength for the exponential growth
> from 4.3 onwards :)
>
> M
>
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