What exactly happens when a DivisionByZero exception is thrown?
What up my fellows? Hope you guys are great! All right, today I’ve got something stuck in my head: What happens when a DivisionByZero exception is thrown? I mean, what is going on internally?
If you have already studied computer architecture, you know that divisions are a sequence of subtractions made by the Logic and Arithmetic Unity. For example, eight divided by four is simply four subtracted from eight twice. We subtract until we can’t subtract anymore.
So, when we want to divide, for example, 8 by 0, we want to subtract zero from eight zero times. So, I would like to know what exactly happens when our CPU has to face this, does it simply stop and the execution is aborted?
exception logic cpu-architecture divide-by-zero
asked Nov 14 '18 at 1:36
Luiz Augusto VenturaLuiz Augusto Ventura
11
add a comment |
What up my fellows? Hope you guys are great! All right, today I’ve got something stuck in my head: What happens when a DivisionByZero exception is thrown? I mean, what is going on internally?
If you have already studied computer architecture, you know that divisions are a sequence of subtractions made by the Logic and Arithmetic Unity. For example, eight divided by four is simply four subtracted from eight twice. We subtract until we can’t subtract anymore.
So, when we want to divide, for example, 8 by 0, we want to subtract zero from eight zero times. So, I would like to know what exactly happens when our CPU has to face this, does it simply stop and the execution is aborted?
exception logic cpu-architecture divide-by-zero
asked Nov 14 '18 at 1:36
Luiz Augusto VenturaLuiz Augusto Ventura
11
4
First of all, real ALUs don't implement division by repeated subtraction, they use much more efficient algorithms. They'd normally just check the divisor for zero in parallel with starting up the process of whatever they actually do, and raise an exception if there's a problem. What CPU architecture are you asking about? On x86,#DE(divide exception) has its own entry in the interrupt descriptor table (IDT) and works like other exceptions (page fault, general protection fault, invalid instruction, etc). wiki.osdev.org/Exceptions
– Peter Cordes
Nov 14 '18 at 3:37
add a comment |
What up my fellows? Hope you guys are great! All right, today I’ve got something stuck in my head: What happens when a DivisionByZero exception is thrown? I mean, what is going on internally?
If you have already studied computer architecture, you know that divisions are a sequence of subtractions made by the Logic and Arithmetic Unity. For example, eight divided by four is simply four subtracted from eight twice. We subtract until we can’t subtract anymore.
So, when we want to divide, for example, 8 by 0, we want to subtract zero from eight zero times. So, I would like to know what exactly happens when our CPU has to face this, does it simply stop and the execution is aborted?
exception logic cpu-architecture divide-by-zero
asked Nov 14 '18 at 1:36
Luiz Augusto VenturaLuiz Augusto Ventura
11
What up my fellows? Hope you guys are great! All right, today I’ve got something stuck in my head: What happens when a DivisionByZero exception is thrown? I mean, what is going on internally?
If you have already studied computer architecture, you know that divisions are a sequence of subtractions made by the Logic and Arithmetic Unity. For example, eight divided by four is simply four subtracted from eight twice. We subtract until we can’t subtract anymore.
So, when we want to divide, for example, 8 by 0, we want to subtract zero from eight zero times. So, I would like to know what exactly happens when our CPU has to face this, does it simply stop and the execution is aborted?
exception logic cpu-architecture divide-by-zero
exception logic cpu-architecture divide-by-zero
asked Nov 14 '18 at 1:36
Luiz Augusto VenturaLuiz Augusto Ventura
11
asked Nov 14 '18 at 1:36
Luiz Augusto VenturaLuiz Augusto Ventura
11
asked Nov 14 '18 at 1:36
Luiz Augusto VenturaLuiz Augusto Ventura
11
asked Nov 14 '18 at 1:36
Luiz Augusto VenturaLuiz Augusto Ventura
11
asked Nov 14 '18 at 1:36
Luiz Augusto VenturaLuiz Augusto Ventura
11
11
4
First of all, real ALUs don't implement division by repeated subtraction, they use much more efficient algorithms. They'd normally just check the divisor for zero in parallel with starting up the process of whatever they actually do, and raise an exception if there's a problem. What CPU architecture are you asking about? On x86,#DE(divide exception) has its own entry in the interrupt descriptor table (IDT) and works like other exceptions (page fault, general protection fault, invalid instruction, etc). wiki.osdev.org/Exceptions
– Peter Cordes
Nov 14 '18 at 3:37
add a comment |
4
First of all, real ALUs don't implement division by repeated subtraction, they use much more efficient algorithms. They'd normally just check the divisor for zero in parallel with starting up the process of whatever they actually do, and raise an exception if there's a problem. What CPU architecture are you asking about? On x86,#DE(divide exception) has its own entry in the interrupt descriptor table (IDT) and works like other exceptions (page fault, general protection fault, invalid instruction, etc). wiki.osdev.org/Exceptions
– Peter Cordes
Nov 14 '18 at 3:37
4
4
First of all, real ALUs don't implement division by repeated subtraction, they use much more efficient algorithms. They'd normally just check the divisor for zero in parallel with starting up the process of whatever they actually do, and raise an exception if there's a problem. What CPU architecture are you asking about? On x86,
#DE (divide exception) has its own entry in the interrupt descriptor table (IDT) and works like other exceptions (page fault, general protection fault, invalid instruction, etc). wiki.osdev.org/Exceptions– Peter Cordes
Nov 14 '18 at 3:37
First of all, real ALUs don't implement division by repeated subtraction, they use much more efficient algorithms. They'd normally just check the divisor for zero in parallel with starting up the process of whatever they actually do, and raise an exception if there's a problem. What CPU architecture are you asking about? On x86,
#DE (divide exception) has its own entry in the interrupt descriptor table (IDT) and works like other exceptions (page fault, general protection fault, invalid instruction, etc). wiki.osdev.org/Exceptions– Peter Cordes
Nov 14 '18 at 3:37
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
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: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
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%2fstackoverflow.com%2fquestions%2f53291947%2fwhat-exactly-happens-when-a-divisionbyzero-exception-is-thrown%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- 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.
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%2fstackoverflow.com%2fquestions%2f53291947%2fwhat-exactly-happens-when-a-divisionbyzero-exception-is-thrown%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
4
First of all, real ALUs don't implement division by repeated subtraction, they use much more efficient algorithms. They'd normally just check the divisor for zero in parallel with starting up the process of whatever they actually do, and raise an exception if there's a problem. What CPU architecture are you asking about? On x86,
#DE(divide exception) has its own entry in the interrupt descriptor table (IDT) and works like other exceptions (page fault, general protection fault, invalid instruction, etc). wiki.osdev.org/Exceptions– Peter Cordes
Nov 14 '18 at 3:37