[Issue 12164] Function returning ptrdiff_t.min in 64-bit returning 0 when -O is set.

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12164


Orvid King <blah38621 at gmail.com> changed:

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                 CC|                            |blah38621 at gmail.com


--- Comment #8 from Orvid King <blah38621 at gmail.com> 2014-03-31 07:49:58 PDT ---
One thing I am curious of in that generated code, why is it allocating 16 bytes
on the stack when it doesn't use the stack? (sub RSP, 0x10) Also, I missing
something here, but when did parameters start getting passed in ESI and EDI?

As a bonus question, I have to ask, why are we doing that comparison with cmpsb
when the size of the values being compared is known to be a multiple of 4, in
which case, shouldn't we be using cmpsd? (this is quite literally a 4x speed
improvement, as both instructions have the same cycle count)

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