[cairo-bugs] [Bug 37836] New: Unneeded invocations of memcpy()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37836

           Summary: Unneeded invocations of memcpy()
           Product: cairo
           Version: 1.10.3
          Platform: x86 (IA32)
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: fdt0317.20.swsnyder at spamgourmet.com
         QAContact: cairo-bugs at cairographics.org


Created an attachment (id=47444)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=47444)
Skip zero-byte-length call to memcpy()

In function _cairo_path_fixed_add() (file cairo-path-fixed.c, as pulled from
the Thunderbird 5.0 Beta1 source) memcpy() is frequently invoked to copy zero
bytes.

My observation with TB 5.0b1 is that in 16% of the calls a byte length of zero
is specified.  Further, the code as built by Mozilla using VS2005/VS2008 is
generated as functions, not as inline intrinsics.

Not a huge burden, but why incur the cost of these pointless calls to memcpy()
if we don't have to?

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