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02.17.2005 at 09:47PM PST, ID: 21319697
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x86 - LEA

Tags: lea, x86
This has been puzzling me for a while - of what use is the LEA instruction?

To me it just looks like a MOV instruction which can take a relatively-complex second argument - nothing that can't be done with a MOV, a MUL and an ADD. I know (I think) it was created for loading table/array offsets with indices, but what makes it worth the trouble of implementing, except for conforming to a CISC architecture that is already very complex?

I know it's fast - lea eax, [8*eax+eax] is better than a mul eax, 9, but are there any special 'LEA' tricks?
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Question Stats
Zone: Programming
Question Asked By: aib_42
Solution Provided By: grg99
Participating Experts: 2
Solution Grade: A
Views: 215
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02.18.2005 at 01:42AM PST, ID: 13343788

Rank: Guru

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02.18.2005 at 07:19AM PST, ID: 13346383

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02.18.2005 at 06:00PM PST, ID: 13351126

Rank: Master

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02.19.2005 at 01:50AM PST, ID: 13352677

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02.19.2005 at 06:18AM PST, ID: 13353373

Rank: Master

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