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Old 20 January 2021, 20:31   #14
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 46
Posts: 24,786
Some new information about FPIAR behavior (FPSP for 68060 comes with test code which I didn't notice previously. It was mentioned in Hatari mailing list few days ago)

68060: Almost all FPU instructions update FPIAR, even if it does not cause exception.

68040: same as 68060 except FPU instructions like FScc, FTRAPcc, FBcc and DBcc don't modify FPIAR. (Perhaps others too)

6888x: FPIAR is only updated if instruction caused arithmetic exception.
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