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Go to reply no.
MIUI Version
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ROM version
Global Beta ROM
Country/Region
Description
Dialer call time not updated until next launch of app...
Steps to reproduce
Open dialer and note time of any call.
Then keep dialer open for sometime and the time is not updated.
Close the app and reopen it the time is updated.
Screenshot
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xPSR data not updated.
AuthorCH WU
Posted23-May- GMT
ToolsetARM
&xPSR data not updated.
I am using the Keil 5.23 and running simulation for the
STM32F103ZE
I am using optimization Level 0 (-O0)
In C, I have declared two variables i j
then I have 2 instructions in C
dummy = i +
dummy = i -
When I switch to Disassembly and looking to the disassembly
the register value
before executing the ADD r2,r2,r3 the XPSR shows
N = 1, Z = 0, C = 1, V = 0, Q = 0, T = 1;
After the ADD instruction, results remains the same..
However, from the addition, there should be NO Carry after the
addition, why the status of the xPSR not updated ?
It would be grateful if I can get any help on that..
AuthorRobert McNamara
Posted25-May- GMT
ToolsetARM
&RE: xPSR data not updated.
Robert McNamara
ADD instruction does not modify the flags
ADDS instruction does modify the flags
AuthorCH WU
Posted12-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Thanks for your reply. However, the Assembly instruction is
translated by the ARMCC
How can I force the ARMCC to use ADDS instead of ADD
Since for similar code
dummy = i - j, the ARMCC translated to SUBS.
Thanks for your help
AuthorRobert McNamara
Posted12-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Robert McNamara
How can I force the ARMCC to use ADDS instead of
You cannot.
AuthorCH WU
Posted14-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear Robert,
Thanks for your reply.
However, in that case, can you enlighten me why the compiler will do
this way ?
Actually I want to let the students know in assembly how the flags
in my program I tried to let them do some operations.
dummy = i & &- In assembly, it will be translated to
dummy = i | &- In assembly, it will be translated to ORRS
dummy = i ^ &- In assembly, it will be translated to EORS
dummy = i + &- In assembly, it will be translated to ADD
dummy = i - &- In assembly, it will be translated to SUBS
How come only ADD it will not affect the flags ?
if i = 0x7FFFFFFF; and j = 0x; then after ADD, it will have
an overflow
Can you enlighten me why the compiler translated this way ?
As you said, if I cannot force the compiler to use ADDS, any
alternatives that I can do ?
Thanks for your help.
WU, Chi Hang
AuthorRobert McNamara
Posted14-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Robert McNamara
If you want full control of what instructions are generated you
should be writing in assembly language.
As far as the code generated, what you say is generated seems
valid so there is nothing there to complain about. When I write
assembly language I never set the flags unless I am going to test the
flags, but that is mostly because it is an extra letter to type. That
is not really an issue for the code generation from the compiler so
it really only has to make sure the code generated is valid.
AuthorCH WU
Posted14-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear Robert,
Thanks for your reply.
I understand that if I want to full use, I need to use assembly
Even if I write in assembly language, I am not setting the flags
because the flags should be
set by the machine upon the result of the execution of the code.
Anyway, I am not complaining anything but just want somebody to
enlighten me why this exception
of ADD is in the case while all others instruction will have an S
As you said, it is complier generated assembly language,
generating one more S will
not take too much time but that would affect others to use assembly
to check if the status
of the processor is correct.
Thanks for your help.
WU, Chi Hang
AuthorNevil Carraartt
Posted14-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Nevil Carraartt
How can you be teaching this stuff when you clearly lack
understanding yourself?
But, that said, I remember being in classes where some students
were way more familiar with the subject than the lecturer.
You might find it useful to read up on the ARM instruction set and
some C tutorials.
AuthorCH WU
Posted14-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear Nevil,
Thanks for your comment, and I am sure I am clear what I teach to
my students.
As said in my previous post, and up to now, there is no one
telling me why the compiler
is doing this way and I am trying my best to understand the logic
from the compiler.
Learning is a continuous process, and that's why I am eager to ask
and see if I can
learn more things from the forum and I am stating my point and let
others to comment in
what way I am thinking wrongly.
Finally, I had my solution to solve the problem using the assembly
code, but at this moment
I still cannot understand why the compiler only translate the i + j
differently in
comparison to other & | ^ and - commands.
Actually I am switching from IAR to Keil, the other compiler does
not have this problem and
that makes me to think why Keil is doing this way.
For sure I will be trying my best to read the ARM instruction set
and the C tutorials to
make my teaching better, but I am disappointed with the atmosphere of
this forum.
Thanks anyway.
WU, Chi Hang
AuthorNevil Carraartt
Posted14-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Nevil Carraartt
The very first thing you must understand is that the compiler is
doing nothing wrong and it is not a problem.
So long as the compiler produces code that satisfies the
requirements of the original source code and the relevant language
standards, then it is free to create that code in any way it wishes.
So long as the compiler complies with these requirements it is free
to use ADD or ADDS.
Most sane people using the compiler will not care what precise
instructions are being generated by the compiler. To expect otherwise
is a problem of the person questioning the situation.
As already stated, if you need precise instruction sequences, you
should be using assembler.
AuthorCH WU
Posted14-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear Nevil,
Thanks for your prompt reply and enlighten me by the
following..
So long as the compiler produces code that satisfies the
requirements of the original
source code and the relevant language standards, then it is free to
create that code
in any way it wishes.
As a result, I will solve the problem using assembly language.
Many thanks for your time and effort.
WU, Chi Hang.
AuthorJohn Linq
Posted15-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
& I still cannot understand why the compiler only translate
the i + j differently in
comparison to other & | ^ and - commands. &
In my testing,
int main(void)
int x = 0x;
// volatile
int y = 0xDEADBEEF;
// volatile
// volatile
z = x + UART2_putchar( z );
z = x - UART2_putchar( z );
z = x & UART2_putchar( z );
z = x | UART2_putchar( z );
z = x ^ UART2_putchar( z );
My result is:
+ &-& ADDS
- &-& SUBS
AuthorJohn Linq
Posted15-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
I would assume that more testing is needed.
AuthorCH WU
Posted15-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear John,
Thanks for your further help ...
From your setting, AND ORR EOR will not update flags..
and upon my further testing ..
my setting is somehow differ than you and as follows..
int main(void)
dummy = i &
dummy = x &
// results NOP
// results NOP
dummy = i |
dummy = x |
// results NOP
// results NOP
dummy = i ^
dummy = x ^
// results NOP
// results NOP
dummy = i +
dummy = x +
// results NOP
// results NOP
dummy = i -
dummy = x -
// results NOP
// results NOP
__asm("NOP");
I trie in main
and repeat all the instructions and replace dummy with z // as
all are translated as NOP.
It seems related to global and local variable ?
Thanks for your time, John. I really appreciate your help and
BTW, all the code are in Optimization Level 0.
AuthorNevil Carraartt
Posted15-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Nevil Carraartt
You're using the word testing as if you're trying to
identify a fault.
There is NO fault. Even if you find a way of achieving what you
want today, there is absolutely NO guarantee that the next release
(or previous release) will create the same code.
As I indicated before, the compiler is free to use whatever
instructions it wants. If you want specific instructions, you'll need
to do so in assembler.
Rather than trying to persuade the compiler to do what you want,
you should really understand what the compiler is permitted to
AuthorWestonsupermare Pier
Posted15-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Westonsupermare Pier
The compiler is likely trying to preserve the state of the flags
so it can carry forward a previous test. That's the point of having
the ADD and ADDS variants in the first place.
The compiler gets to manage the use of the general purpose
registers, including the flags. It also has to work with the subset
of instructions a particular ISA provides.
These are more likely to use the ADDS form because the result is
of importance.
if (++c == 0) puts("foo");
if ((a += b) &= 0) puts("bar");
One might want to review RISC concepts, especially ARM's
conditional execution. In other architectures the dependency hazards
caused by the availability of the result/status of the prior
instruction to the pipeline.
AuthorWestonsupermare Pier
Posted15-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Westonsupermare Pier
&&For sure I will be trying my best to read the ARM
instruction set and the C tutorials to
make my teaching better, but I am disappointed with the atmosphere of
this forum.
Unfortunately we see the results of poor/ineffective teaching
methods here a lot, so it is a point of frustration.
If a student comes here expecting us to do their homework from
scratch the teacher has failed. Failed to provide them with the
insight to do the work, and failed to teach basic problem solving and
logical deduction, rather than just "ask the internet" or cut-n-paste
some code together, they don't understand, hoping for a
Shakespeare-Monkey event to occur.
I'm an EE with a BEng, on paper you are likely a lot more
qualified, so I have higher expectations.
AuthorJohn Linq
Posted16-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
& I still cannot understand why the compiler only translate
the i + j differently in
comparison to other & | ^ and - commands. &
I believe that, you already know that your above assumption is
incorrect.
This is what I have tried to convince you.
And I also believe that, from Westonsupermare Pier's 15-Jun-2017
13:34 GMT post, you (and me) already know that compiler
chooses instructions based on the Source Code Context. When
the demo source code is so short, compiler just chooses instructions
whatever it likes.
Please don't be disappointed with the atmosphere of this forum,
you did get the help you need (not from me) from Westonsupermare
Pier's valuable post.
Many Thanks for Westonsupermare Pier.
AuthorJohn Linq
Posted16-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
& You're using the word testing as if you're trying to
identify a fault. &
I am not a native English speaker.
I used the word testing, because
A. I believe that OP's original assumption is incorrect.
B. When I get a new device, and don't know how to use it, I will do
some testing to figure it out. This doesn't mean it is a faulty
Sorry for any misunderstanding caused.
AuthorJohn Linq
Posted16-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
I also redo your latest testing, got the same result as yours. ( I
am not using Keil 5.23. )
Chiu, John Linq
Zhao, John Linq
Chao, John Linq
AuthorCH WU
Posted16-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear John,
Thanks for input and I admit that my original assumption is
incorrect.
Your code gives direction to me and helps alot.
My sincere thanks to you..
I am sure I did get help from this forum which allows
collaborative inputs.
WU, Chi Hang
AuthorCH WU
Posted16-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear Westonsupermare Pier,
Thanks for your suggestion and that triggered me to have a really
deeper understanding on
those material I need to teach.
Honestly, paper qualification is not important to me. I would
appreciate a person
without any diploma or certificates but experienced on their field
who can give me
insight to solve problems.
Very appreciate your inputs.
WU, Chi Hang
AuthorHans-Bernhard Broeker
Posted16-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Hans-Bernhard Broeker
I would appreciate a person
without any diploma or certificates but experienced on their field
who can give me
insight to solve problems.
You say that, but I don't really see you doing so. You've
rather consistently been ignoring all the insight offered to you ---
often in the same post in which you claim to have understood and
accepted it.
So hopefully for the last time, let me put it strongly, but
simply: you keep asking the wrong questions, because those questions
are based on a colossal misunderstanding of what the job of a
compiler is.
The job of the compiler is to generate machine code that does the
work described by the actual source code. It's entirely up to the
compiler to decide how it does that. Any and all hard expectations
regarding the compiler's decisions are wrong. Of course you
could run all kind of experiments to see what happens if you do
"this", as opposed to "that", but that would be an exercise in
futility, because the results will be largely unreliable.
And to top it off, said misunderstanding is quite typical of total
greenhorns who have never used a high-level language before. That's
what worries us so, as we see it manifest in a person who plans to
teach this stuff.
AuthorCH WU
Posted19-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear Hans-Bernhard Broeker,
Thanks for your statement of the job of the compiler and that
would be informative to me.
Like a compiler, it is free for you to think if I am not
appreciating the other's work,
however, I truly appreciate all the information I got from here.
WU, Chi Hang
AuthorCH WU
Posted16-Jun- GMT
ToolsetARM
&RE: xPSR data not updated.
Dear Nevil,
My apology to you if the word testing offended you in any
I agreed with you that
Rather than trying to persuade the compiler to do what you
you should really understand what the compiler is permitted to
and that's why I said before I will solve the problem using
assembly language
But at the same time with what the complier output, I can explore
if there are any
alternatives rather than directly using assembly language that can
achieve my goal.
May be I can use conducting experiments if you think testing is not a
good word.
Thanks for John that he gave me some insights and I can work on
As what you said, if it is what compiler permitted to use, I
cannot see any fault here and
because it is no fault, I will not expect any update on it. But
still, the compiler is free
to use whatever instructions it wants, what I can do it adapting with
the compiler output.
WU, Chi Hang
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