multiplication

问题 I have found out that both mul and imul can be used to multiply a signed number to an unsigned number. For example: global _start section .data byteVariable DB -5 section .text _start: mov al, 2 imul BYTE [byteVariable] You can replace imul with mul , and the result would still be the same ( -10 ). Are mul and imul exactly the same when multiplying a signed number to an unsigned number, or is there a difference between them? 回答1: The upper half is different, as mentioned in the comments. If

问题 Consider that you want to calculate the low 128-bits of the result of multiplying a 64-bit and 128-bit unsigned number, and that the largest multiplication you have available is the C-like 64-bit multiplication which takes two 64-bit unsigned inputs and returns the low 64-bits of the result. How many multiplications are needed? Certainly you can do it with eight: break all the inputs up into 32-bit chunks and use your 64-bit multiplication to do the 4 * 2 = 8 required full-width 32*32->64

问题 Consider that you want to calculate the low 128-bits of the result of multiplying a 64-bit and 128-bit unsigned number, and that the largest multiplication you have available is the C-like 64-bit multiplication which takes two 64-bit unsigned inputs and returns the low 64-bits of the result. How many multiplications are needed? Certainly you can do it with eight: break all the inputs up into 32-bit chunks and use your 64-bit multiplication to do the 4 * 2 = 8 required full-width 32*32->64

来源： https://stackoverflow.com/questions/43644203/why-in-one-case-multiplying-big-numbers-gives-a-wrong-result

来源： https://stackoverflow.com/questions/47746646/where-is-documented-in-tensorflow

来源： https://stackoverflow.com/questions/47746646/where-is-documented-in-tensorflow

来源： https://stackoverflow.com/questions/30606365/overflow-occurs-with-multiplication

来源： https://stackoverflow.com/questions/30606365/overflow-occurs-with-multiplication

来源： https://stackoverflow.com/questions/30606365/overflow-occurs-with-multiplication

来源： https://stackoverflow.com/questions/59643944/multiply-1d-array-by-1d-array-or-constant-vba