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dumping the reservation

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dumping the reservation

Subject: dumping the reservation
From: Shaun Wexler <email@hidden>
Date: Wed, 13 Sep 2006 18:40:58 -0700

Is there a definitive spec for what to do about dumping the ldarx/ lwarx reservation on G5 vs G3/G4? I've seen code written four different ways: [1] my default which was to always dump it to -8(SP) regardless of CPU type, [2] dump it on G5 only, [3] store the same data back to the same address, or [4] leave it pending (ignore without storing) and continue.

Now that I've rewritten all my asm with __LP64__ versions, I'm tempted to leave the ILP32 version optimized for G4 but want to know what type of pipeline flush or whatever I'd be causing on the G5 in doing so. Note that I have mainly G4-UP and an increasing number of i386-MP users, so G3/G5-UP,MP/i386-UP aren't as much of a concern in this case. -- Shaun Wexler MacFOH http://www.macfoh.com


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