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October 29, 2014 Equivalent in D for .p2align 4,,15 ? | ||||
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I'm looking for the D inline assembler equivalent of the .p2align 4,,15 directive to optimize a loop. Here's more information: http://stackoverflow.com/questions/21546946/what-p2align-does-in-asm-code I tried searching through a turbo assembler tutorial (because D's is based on it) and found nothing except a few hints here: http://www.csn.ul.ie/~darkstar/assembler/manual/a10.txt There might be a way through segments, directives, but I'm not sure at all if D supports it. Does anyone have any idea if/how I can align my code this way or if the compiler handles it? |
October 29, 2014 Re: Equivalent in D for .p2align 4,,15 ? | ||||
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Posted in reply to Etienne | On Wednesday, 29 October 2014 at 17:16:23 UTC, Etienne wrote: > I'm looking for the D inline assembler equivalent of the .p2align 4,,15 directive to optimize a loop. > > Here's more information: > http://stackoverflow.com/questions/21546946/what-p2align-does-in-asm-code > > I tried searching through a turbo assembler tutorial (because D's is based on it) and found nothing except a few hints here: http://www.csn.ul.ie/~darkstar/assembler/manual/a10.txt > > There might be a way through segments, directives, but I'm not sure at all if D supports it. > > Does anyone have any idea if/how I can align my code this way or if the compiler handles it? As far as I understand, `.p2align 4,,15` aligns to a 16 byte boundary, and the third argument could be left out, because more than 15 bytes wouldn't ever be skipped anyway. D inline assembler has an 'align' directive [1]. Aligning to a 16 byte boundary in D: `align 16;`. [1] http://dlang.org/iasm.html -- "align IntegerExpression", near the top |
October 29, 2014 Re: Equivalent in D for .p2align 4,,15 ? | ||||
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Posted in reply to anonymous | On 2014-10-29 1:44 PM, anonymous wrote:
>
> D inline assembler has an 'align' directive [1]. Aligning to a 16
> byte boundary in D: `align 16;`.
>
> [1] http://dlang.org/iasm.html -- "align IntegerExpression", near
> the top
Of course, align directive works on instructions in asm. Thanks anonymous, that was a very simple explanation.
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