Bitwise rotate of integral
H. S. Teoh
hsteoh at quickfur.ath.cx
Mon Jan 7 23:20:57 UTC 2019
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.
I don't trust computers, I've spent too long programming to think that they can get anything right. -- James Miller
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