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en:multiasm:papc:chapter_6_10 [2025/10/31 18:27] – [FPU control instructions] ktokarzen:multiasm:papc:chapter_6_10 [2026/02/18 11:29] (current) – [Basic arithmetic instructions] ktokarz
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 | **fdivp** |  ST(1) / ST(0)  |  ST(1)  |  yes  | | **fdivp** |  ST(1) / ST(0)  |  ST(1)  |  yes  |
 </table> </table>
-The addition and multiplication operations are commutative, while subtraction and division are not. That's why the reversed versions of subtraction and addition are implemented. The difference is the order of operations, while the destination remains the same as in non-reversed versions.+The addition and multiplication operations are commutative, while subtraction and division are not. That's why the reversed versions of subtraction and division are implemented. The difference is the order of operations, while the destination remains the same as in non-reversed versions.
  
 <table frevarithmetic> <table frevarithmetic>
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 <table ftrans> <table ftrans>
 <caption>Transcendental arithmetic instructions</caption> <caption>Transcendental arithmetic instructions</caption>
-^ Mnemonic     ^ operation                              ^ note                    ^+^ Mnemonic     ^ operation                              ^ note on operands        ^
 | **f2xm1**    | {{ :en:multiasm:cs:f2xm1.png?105 }}    |                         | | **f2xm1**    | {{ :en:multiasm:cs:f2xm1.png?105 }}    |                         |
 | **fyl2x**    | {{ :en:multiasm:cs:fyl2x.png?105 }}    | y is ST(1); x is ST(0)  | | **fyl2x**    | {{ :en:multiasm:cs:fyl2x.png?105 }}    | y is ST(1); x is ST(0)  |
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 ===== FPU control instructions ===== ===== FPU control instructions =====
 The FPU control instructions help the programmer to save and restore the contents of chosen registers if there is a need to use them in an interrupt handler or inside a function. It is also possible to initialise the state of the FPU unit or clear errors. The FPU control instructions help the programmer to save and restore the contents of chosen registers if there is a need to use them in an interrupt handler or inside a function. It is also possible to initialise the state of the FPU unit or clear errors.
-The **fincstp*** increments and **fdecstp** decrements the FPU register stack pointer.+The **fincstp** increments and **fdecstp** decrements the FPU register stack pointer.
 The following set of instructions can perform error checking while execution (instructions without "N") or perform the operation without checking for error conditions (instructions without "N"). The following set of instructions can perform error checking while execution (instructions without "N") or perform the operation without checking for error conditions (instructions without "N").
 The **finit** and **fninit** initialise the FPU (after checking error conditions or without checking error conditions). The **finit** and **fninit** initialise the FPU (after checking error conditions or without checking error conditions).
en/multiasm/papc/chapter_6_10.1761928055.txt.gz · Last modified: by ktokarz
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