[Issue 7691] A pure std.math.floor

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https://issues.dlang.org/show_bug.cgi?id=7691

AndyC a...@squeakycode.net changed:

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--- Comment #5 from AndyC a...@squeakycode.net ---
In dmd 2.066.1, I get:
$ dmd test.d
/usr/include/dmd/phobos/std/math.d(4183): Error: Cannot convert double to
ulong* at compile time
/usr/include/dmd/phobos/std/math.d(3288):called from here: isNaN(x)
test.d(4):called from here: floor(2.3)


Any reason it has to be enum?  Changing it to either const or immutable
compiles fine:

pure void main() {
const double x = floor(2.3);
}

--

[Issue 7691] A pure std.math.floor

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http://d.puremagic.com/issues/show_bug.cgi?id=7691


hst...@quickfur.ath.cx changed:

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--- Comment #1 from hst...@quickfur.ath.cx 2012-03-28 08:04:13 PDT ---
Most std.math functions need use asm; we need to write ctfe versions for them.

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[Issue 7691] A pure std.math.floor

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--- Comment #2 from bearophile_h...@eml.cc 2012-03-28 10:03:17 PDT ---
(In reply to comment #1)
 Most std.math functions need use asm; we need to write ctfe versions for them.

But note that I'd like to use it mostly in run-time code.

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--- Comment #3 from hst...@quickfur.ath.cx 2012-03-28 10:05:51 PDT ---
Does dmd even support pureness checking for asm blocks? If not, I'm not sure
when we will be able to mark asm functions as pure.

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Don clugd...@yahoo.com.au changed:

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--- Comment #4 from Don clugd...@yahoo.com.au 2012-03-28 11:12:44 PDT ---
(In reply to comment #3)
 Does dmd even support pureness checking for asm blocks? If not, I'm not sure
 when we will be able to mark asm functions as pure.

asm blocks are ignored for pureness checking.

And I think it has to be that way. In the asm for BigInt, at one point I write
to a static variable. That variable is never read from, EVER. It's a trick to
force Intel processors to stay in sync every pass through the loop.

It would be impossible to enforce, anyway.

BTW: floor() isn't pure, because floorl() isn't pure,  because floorl(), being
a C function, may set the matherr variable.

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