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notebook/notes/x86-64/instructions/condition-codes.md

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title TARGET DECK FILE TAGS tags
Condition Code Operations Obsidian::STEM x86-64
x86-64

Overview

Instruction Operands Based On Description
cmp[bwlq] S_1, S_2 S_2 - S_1 Compare
test[bwlq] S_1, S_2 S_1 \mathop{\&} S_2 Test

%%ANKI Basic What four variants do CMP instructions take on in x86-64? Back: cmpb, cmpw, cmpl, cmpq Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Basic What instruction class is CMP "based" on? Back: SUB Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Basic What registers does CMP affect? Back: The condition code registers. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Basic What distinguishes CMP from SUB? Back: CMP does not update any destinations. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Basic How does Bryant et al. recommend reading CMP instructions? Back: As subtracting the first operand from the second. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Basic What instruction class is TEST "based" on? Back: AND Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Basic What distinguishes TEST from AND? Back: TEST does not update any destinations. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Basic What four variants do TEST instructions take on in x86-64? Back: testb, testw, testl, testq Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Cloze {1:CMP} is to {2:SUB} as {2:TEST} is to {1:AND}. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

%%ANKI Basic What registers does TEST affect? Back: The condition code registers. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.

END%%

Bibliography

  • Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.