On Tuesday, 8 January 2019 at 09:15:09 UTC, Patrick Schluter
wrote:
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
4.8.2 neither).
Looking at the dmd compiler source code, it requires the value to
be rotated to be
On Tuesday, 8 January 2019 at 12:35:16 UTC, H. S. Teoh wrote:
On Tue, Jan 08, 2019 at 09:15:09AM +, Patrick Schluter via
Digitalmars-d-learn wrote:
On Monday, 7 January 2019 at 23:20:57 UTC, H. S. Teoh wrote:
[...]
> [...]
Are you sure it's dmd looking for the pattern. Playing with
the go
On Tue, Jan 08, 2019 at 09:15:09AM +, Patrick Schluter via
Digitalmars-d-learn wrote:
> On Monday, 7 January 2019 at 23:20:57 UTC, H. S. Teoh wrote:
[...]
> > There's a certain pattern that dmd looks for, that it transforms
> > into a ROL instruction. Similarly for ROR. Deviate too far from
>
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?
LDC does not expose this intrinsic currently, but you can use
LLVM's fshl:
https://llvm.org/d
On Monday, 7 January 2019 at 23:20:57 UTC, H. S. Teoh wrote:
On Mon, Jan 07, 2019 at 11:13:37PM +, 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?
>
On Mon, Jan 07, 2019 at 11:13:37PM +, 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
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:
https://d.godbolt.org/z/C_Sk_-
Generates ROL instruction.
On 1/7/19 10:10 AM, Per Nordlöw wrote:
On Monday, 7 January 2019 at 14:53:26 UTC, Alex wrote:
There are
https://dlang.org/phobos/core_bitop.html#.rol
and
https://dlang.org/phobos/core_bitop.html#.ror
But it seems the implementation is like yours.
Ahh, missed that. Thanks.
Use the core.bitop
On Monday, 7 January 2019 at 14:53:26 UTC, Alex wrote:
There are
https://dlang.org/phobos/core_bitop.html#.rol
and
https://dlang.org/phobos/core_bitop.html#.ror
But it seems the implementation is like yours.
Ahh, missed that. Thanks.
On Monday, 7 January 2019 at 14:43:29 UTC, Per Nordlöw 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?
I just found this
ulong rot
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?
I just found this
ulong rotateLeft(ulong x, ubyte bits)
{
return (x << bits) |
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