Bitwise rotate of integral
Patrick.Schluter at bbox.fr
Tue Jan 8 09:15:09 UTC 2019
On Monday, 7 January 2019 at 23:20:57 UTC, H. S. Teoh wrote:
> On Mon, Jan 07, 2019 at 11:13:37PM +0000, Guillaume Piolat via
> Digitalmars-d-learn wrote:
>> On Monday, 7 January 2019 at 14:39:07 UTC, Per Nordlöw wrote:
>> > What's the preferred way of doing bitwise rotate of an
>> > integral value in D?
>> > Are there intrinsics for bitwise rotation available in LDC?
>> Turns out you don't need any:
>> Generates ROL instruction.
> There's a certain pattern that dmd looks for, that it
> transforms into a ROL instruction. Similarly for ROR. Deviate
> too far from this pattern, though, and it might not recognize
> it as it should. To be sure, always check the disassembly.
Are you sure it's dmd looking for the pattern. Playing with the
godbolt link shows that dmd doesn't generate the rol code (gdc
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