FPCR.FIZ=1: 为哪些浮点指令输入不会被清零?

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英文:

FPCR.FIZ=1: for which floating-point instructions inputs are not flushed to zero?

问题

Arm架构参考手册,A-profile架构(版本I.a)(重点添加):

FIZ,位[0]

当实现了FEAT_AFP时:

0b1 将大多数浮点指令的非规格化单精度和双精度输入刷新为零。

一个简单的问题:在FIZ=1下,哪些浮点指令的输入不会刷新为零?

英文:

Arm Architecture Reference Manual for A-profile architecture (issue I.a) (emphasis added):

> FIZ, bit [0]
>
> When FEAT_AFP is implemented:
>
> 0b1 Denormalized single-precision and double-precision inputs to most floating-point
instructions flushed to zero.

A simple question: for which floating-point instructions inputs are not flushed to zero under FIZ=1?

答案1

得分: 0

以下是翻译好的部分:

一个简单的问题:对于哪些浮点指令在FIZ=1下不会将输入刷新为零?

答:FNEG(取反)和FABS(绝对值)。

英文:

> A simple question: for which floating-point instructions inputs are not flushed to zero under FIZ=1?

FNEG, FABS.

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  • 本文由 发表于 2023年5月29日 20:17:23
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