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digitalmars.D.bugs - [Issue 5703] New: std.intrinsic. and core.bitop.bsf, bsr and bswap should be CTFE-able

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5703

           Summary: std.intrinsic. and core.bitop.bsf, bsr and bswap
                    should be CTFE-able
           Product: D
           Version: D2
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody puremagic.com
        ReportedBy: kennytm gmail.com


--- Comment #0 from kennytm gmail.com 2011-03-05 06:20:20 PST ---
import core.bitop;
enum x = bsf(0b111100);
enum y = bsr(0b111100);
enum z = bswap(0b111100);
static assert(x == 2);
static assert(y == 5);
static assert(z == 0x3C000000);

The three functions bsr, bsf and bswap are pure nothrow, but cannot be used in
CTFE because there is no source code.

These functions should be rewritten in D like bitswap and popcnt.

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5703


kennytm gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement


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prev sibling next sibling parent d-bugmail puremagic.com writes:
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bearophile_hugs eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs eml.cc


--- Comment #1 from bearophile_hugs eml.cc 2011-03-05 10:34:00 PST ---
(In reply to comment #0)


 These functions should be rewritten in D like bitswap and popcnt.


I think they aren't functions.

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--- Comment #2 from kennytm gmail.com 2011-03-05 13:34:17 PST ---
(In reply to comment #1)

 (In reply to comment #0)
 

 These functions should be rewritten in D like bitswap and popcnt.


 
 I think they aren't functions.


They appear to be functions, and can easily implemented as functions too. If
they are special-cased in the compiler, I see no reason they can't be
recognized in CTFE as well.

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prev sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |FIXED


--- Comment #3 from Walter Bright <bugzilla digitalmars.com> 2011-10-08
17:54:33 PDT ---
https://github.com/D-Programming-Language/dmd/commit/f8b88759dd1a27ec983eb9e439da2a45efce239c

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Oct 08 2011