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Author Topic: MEMCLEAR not allowing casts  (Read 7052 times)

Controls Guy

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MEMCLEAR not allowing casts
« on: July 15, 2019, 12:24:33 PM »
Why will MEMCOPY let me cast but MEMCLEAR not?

Code: [Select]
MEMCOPY CustomWP0:UW LastCustomWP0:UW 0x20000 MaxRelayWords

MEMCLEAR LastCustomWP0 MaxRelayCount
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BobO

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Re: MEMCLEAR not allowing casts
« Reply #1 on: July 15, 2019, 01:42:56 PM »
Quote from: Controls Guy on July 15, 2019, 12:24:33 PM
Why will MEMCOPY let me cast but MEMCLEAR not?

Code: [Select]
MEMCOPY CustomWP0:UW LastCustomWP0:UW 0x20000 MaxRelayWords

MEMCLEAR LastCustomWP0 MaxRelayCount

Because we're mean.

MEMCOPY is blind. MEMCLEAR is type-aware and does struct initialization. We could probably make it work for simple types, but it wasn't straightforward.
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Controls Guy

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Re: MEMCLEAR not allowing casts
« Reply #2 on: July 15, 2019, 01:50:09 PM »
Ah, gotcha.  That makes sense.  I was kind of classing the two together mentally.
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BobO

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Re: MEMCLEAR not allowing casts
« Reply #3 on: July 15, 2019, 01:55:14 PM »
Quote from: Controls Guy on July 15, 2019, 01:50:09 PM
Ah, gotcha.  That makes sense.  I was kind of classing the two together mentally.

In a perfect world, they would be, but 'cleared' isn't always 'zero'. For simple types it is, but the instruction is built around type awareness and casting violates that.
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"It has recently come to our attention that users spend 95% of their time using 5% of the available features. That might be relevant." -BobO
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