Hi Erik,
I have a related question; is there any interrest for the avr dev community
to find & corr buggs;
since I could easily work around this, and leave it be.
The fault I think I have encountered, is some opt. that realizes that these
are same statements over and over
and tried to put code making this more efficient. Essentially I move 4
elementes (bytes) from 7 different
arrays, into yet another array (of 4 elsements), depending on a select
parameter.
The move is done by the for(i....) loop. I have tried to follow the
assembler in the .lst file (from the .o),
but thats a bit tricky, expecially since the insertion of the original
C-lines are quite randomly scattered into
the resulting asm. However there seem to be some elaborate thinking/coding
going on, rather than a highy repetitive action
which I had expected. and all the 7 "if() for() " statements are lumped
together.
----- Original Message -----
From: "Erik Christiansen" <dva...@internode.on.net>
To: <avr-gcc-list@nongnu.org>
Sent: Tuesday, January 16, 2018 4:59 AM
Subject: Re: [avr-gcc-list] possible optimize bugg
Reply-To: avr-gcc-list@nongnu.org
On 16.01.18 01:17, georg chambert wrote:
msg_on[0] = 0b10001000; // address
msg_on[1] = 0b00000000; // PWZS Tmmm : (?) mmm = cool
msg_on[2] = 0b10000100; // tttt,vvvv ; 23c , high vent
msg_on[3] = 0b11000000; // pppp, 0 ; parity
----- etc for 6 more messages ----
...
if (msg_nbr == 0) for (i=0;i<4;i++) seq[i] = msg_off[i]; // load a
selected message to send (off)
No information provided on msg_off, so no diagnosis possible.
//if (msg_nbr == 1) for (i=0;i<4;i++) seq[i] = msg_on[i]; //
This is the only line which addresses the msg_on array.
//if (msg_nbr == 2) for (i=0;i<4;i++) seq[i] = msg_on26[i]; //
//if (msg_nbr == 3) for (i=0;i<4;i++) seq[i] = msg_on1[i]; //
//if (msg_nbr == 4) for (i=0;i<4;i++) seq[i] = msg_on2[i];
//if (msg_nbr == 5) for (i=0;i<4;i++) seq[i] = msg_on3[i];
if (msg_nbr == 6) for (i=0;i<4;i++) seq[i] = msg_on4[i];
No information provided on msg_on4, a different array, so no diagnosis
possible.
When I comment out the inbetween statements the last one for 6, works,
else the data in seq array is not what I just put the msg_on4 just
before.
You might try: $ nm yourfile.elf | grep msg_on
then compare the values for msg_on and msg_on4.
If you have made them the same address, in a way not shown, then the
same data could be expected, if I understand what you're trying to do.
Erik
_______________________________________________
AVR-GCC-list mailing list
AVR-GCC-list@nongnu.org
https://lists.nongnu.org/mailman/listinfo/avr-gcc-list
_______________________________________________
AVR-GCC-list mailing list
AVR-GCC-list@nongnu.org
https://lists.nongnu.org/mailman/listinfo/avr-gcc-list
