All sse single - precision operations will , however , use a 24 - bit significand 8 - bit exponent , and sse2 double - precision operations will use a 53 - bit significand 11 - bit exponent 但是,所有sse單精度運(yùn)算都將使用24位有效數(shù)/ 8位指數(shù),而sse2雙精度運(yùn)算將使用53位有效數(shù)/ 11位指數(shù)。
While floating - point data is stored in the fprs in double - precision format , a set of single - precision arithmetic instructions perform the arithmetic operation and round the final result to single - precision while detecting exceptions such as exponent overflow , underflow , and inexact that should occur with a single - precision operation 雖然浮點(diǎn)數(shù)以雙精度格式存儲(chǔ)于fpr中,但是,有一組單精度運(yùn)算指令,可以執(zhí)行運(yùn)算操作并將最終結(jié)果舍入為單精度,同時(shí)檢測(cè)進(jìn)行單精度操作時(shí)可能會(huì)發(fā)生的異常(比如指數(shù)溢出、下溢和失去精度) 。