Why is the AVR GCC compiler using a full `CALL` even though I have set the `-mshort-calls` flag? ...
Take 2! Is this homebrew Lady of Pain warlock patron balanced?
Putting class ranking in CV, but against dept guidelines
Question about debouncing - delay of state change
Can a new player join a group only when a new campaign starts?
Selecting user stories during sprint planning
Converted a Scalar function to a TVF function for parallel execution-Still running in Serial mode
Is there a kind of relay only consumes power when switching?
How does light 'choose' between wave and particle behaviour?
Do wooden building fires get hotter than 600°C?
ArcGIS Pro Python arcpy.CreatePersonalGDB_management
What's the meaning of "fortified infraction restraint"?
A term for a woman complaining about things/begging in a cute/childish way
Disembodied hand growing fangs
Can anything be seen from the center of the Boötes void? How dark would it be?
How to tell that you are a giant?
Dating a Former Employee
How fail-safe is nr as stop bytes?
Maximum summed subsequences with non-adjacent items
What is "gratricide"?
How do I find out the mythology and history of my Fortress?
As a beginner, should I get a Squier Strat with a SSS config or a HSS?
How would a mousetrap for use in space work?
What is the topology associated with the algebras for the ultrafilter monad?
What is the difference between globalisation and imperialism?
Why is the AVR GCC compiler using a full `CALL` even though I have set the `-mshort-calls` flag?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Arduino Bootloader DetailsNeed explanation on how to flash HEX files on ATmega32u4 via AVR109 protocolHow can I wake up an ATtiny84 microcontroller at specific time of the day?Millis versus centis on AVR platformHow can I bind a local variable to AVR's rXX register?Can you set the PWM output of an Atmel AVR to a specific frequency and have control over duty cycle?Avr-gcc does not compile correctly without optimizations, but works (badly) with -OsMissed Interrupt Problem with Attiny85SPI Flash Memory with ATMega1284Bus fault when accessing mcu internal peripheral
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
$begingroup$
I have set the -mshort-calls flag which is documented to replace the 4 byte long CALL instruction with the 2 byte long RCALL instruction when possible to save flash space and and cycles...
Unfortunately the compiler is still using full CALL instructions even for a call that is only 2 bytes away...
...
35f6: 0e 94 fd 1a call 0x35fa ; 0x35fa
35fa: f8 94 cli
...
What am I doing wrong?
avr gcc rcall
asked 2 hours ago
bigjoshbigjosh
7,2801736
$endgroup$
add a comment |
$begingroup$
I have set the -mshort-calls flag which is documented to replace the 4 byte long CALL instruction with the 2 byte long RCALL instruction when possible to save flash space and and cycles...
Unfortunately the compiler is still using full CALL instructions even for a call that is only 2 bytes away...
...
35f6: 0e 94 fd 1a call 0x35fa ; 0x35fa
35fa: f8 94 cli
...
What am I doing wrong?
avr gcc rcall
asked 2 hours ago
bigjoshbigjosh
7,2801736
$endgroup$
add a comment |
$begingroup$
I have set the -mshort-calls flag which is documented to replace the 4 byte long CALL instruction with the 2 byte long RCALL instruction when possible to save flash space and and cycles...
Unfortunately the compiler is still using full CALL instructions even for a call that is only 2 bytes away...
...
35f6: 0e 94 fd 1a call 0x35fa ; 0x35fa
35fa: f8 94 cli
...
What am I doing wrong?
avr gcc rcall
asked 2 hours ago
bigjoshbigjosh
7,2801736
$endgroup$
I have set the -mshort-calls flag which is documented to replace the 4 byte long CALL instruction with the 2 byte long RCALL instruction when possible to save flash space and and cycles...
Unfortunately the compiler is still using full CALL instructions even for a call that is only 2 bytes away...
...
35f6: 0e 94 fd 1a call 0x35fa ; 0x35fa
35fa: f8 94 cli
...
What am I doing wrong?
avr gcc rcall
avr gcc rcall
asked 2 hours ago
bigjoshbigjosh
7,2801736
asked 2 hours ago
bigjoshbigjosh
7,2801736
edited 2 hours ago
bigjosh
asked 2 hours ago
bigjoshbigjosh
7,2801736
asked 2 hours ago
bigjoshbigjosh
7,2801736
asked 2 hours ago
bigjoshbigjosh
7,2801736
7,2801736
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
It appears that this option changed at some point and not all the documentation was updated. Atmel Studio also still uses the obsolete flag.
The new option is called -mrelax on the compiler command line or --relax on the linker command line...
https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/AVR-Options.html
After adding that flag, the above code compiled to...
...
3584: 00 d0 rcall .+0 ; 0x3586
3586: f8 94 cli
...
If you happened to be using Atmel Studio, I put the flag here...
In my case, this change resulted in significant flash savings. If you are here because you also need to save flash space and/or cycles, I'd also recommend looking into enabling Link Time Optimization which also offers great savings at no cost.
answered 2 hours ago
bigjoshbigjosh
7,2801736
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
return StackExchange.using("schematics", function () {
StackExchange.schematics.init();
});
}, "cicuitlab");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "135"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f433335%2fwhy-is-the-avr-gcc-compiler-using-a-full-call-even-though-i-have-set-the-msh%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
It appears that this option changed at some point and not all the documentation was updated. Atmel Studio also still uses the obsolete flag.
The new option is called -mrelax on the compiler command line or --relax on the linker command line...
https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/AVR-Options.html
After adding that flag, the above code compiled to...
...
3584: 00 d0 rcall .+0 ; 0x3586
3586: f8 94 cli
...
If you happened to be using Atmel Studio, I put the flag here...
In my case, this change resulted in significant flash savings. If you are here because you also need to save flash space and/or cycles, I'd also recommend looking into enabling Link Time Optimization which also offers great savings at no cost.
answered 2 hours ago
bigjoshbigjosh
7,2801736
$endgroup$
add a comment |
$begingroup$
It appears that this option changed at some point and not all the documentation was updated. Atmel Studio also still uses the obsolete flag.
The new option is called -mrelax on the compiler command line or --relax on the linker command line...
https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/AVR-Options.html
After adding that flag, the above code compiled to...
...
3584: 00 d0 rcall .+0 ; 0x3586
3586: f8 94 cli
...
If you happened to be using Atmel Studio, I put the flag here...
In my case, this change resulted in significant flash savings. If you are here because you also need to save flash space and/or cycles, I'd also recommend looking into enabling Link Time Optimization which also offers great savings at no cost.
answered 2 hours ago
bigjoshbigjosh
7,2801736
$endgroup$
add a comment |
$begingroup$
It appears that this option changed at some point and not all the documentation was updated. Atmel Studio also still uses the obsolete flag.
The new option is called -mrelax on the compiler command line or --relax on the linker command line...
https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/AVR-Options.html
After adding that flag, the above code compiled to...
...
3584: 00 d0 rcall .+0 ; 0x3586
3586: f8 94 cli
...
If you happened to be using Atmel Studio, I put the flag here...
In my case, this change resulted in significant flash savings. If you are here because you also need to save flash space and/or cycles, I'd also recommend looking into enabling Link Time Optimization which also offers great savings at no cost.
answered 2 hours ago
bigjoshbigjosh
7,2801736
$endgroup$
It appears that this option changed at some point and not all the documentation was updated. Atmel Studio also still uses the obsolete flag.
The new option is called -mrelax on the compiler command line or --relax on the linker command line...
https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/AVR-Options.html
After adding that flag, the above code compiled to...
...
3584: 00 d0 rcall .+0 ; 0x3586
3586: f8 94 cli
...
If you happened to be using Atmel Studio, I put the flag here...
In my case, this change resulted in significant flash savings. If you are here because you also need to save flash space and/or cycles, I'd also recommend looking into enabling Link Time Optimization which also offers great savings at no cost.
answered 2 hours ago
bigjoshbigjosh
7,2801736
edited 2 hours ago
answered 2 hours ago
bigjoshbigjosh
7,2801736
answered 2 hours ago
bigjoshbigjosh
7,2801736
answered 2 hours ago
bigjoshbigjosh
7,2801736
7,2801736
add a comment |
add a comment |
Thanks for contributing an answer to Electrical Engineering Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f433335%2fwhy-is-the-avr-gcc-compiler-using-a-full-call-even-though-i-have-set-the-msh%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
