[Bug c++/54988] fpmath=sse target pragma causes inlining failure because of target specific option mismatch

[thiago at kde dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54988



--- Comment #3 from Thiago Macieira <thiago at kde dot org> 2012-10-22 14:43:11 
UTC ---

This might be as I pointed out in

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54231:



(Node "Function attributes"):



     On the 386/x86_64 and PowerPC backends, the inliner will not

     inline a function that has different target options than the

     caller, unless the callee has a subset of the target options of

     the caller.  For example a function declared with `target("sse3")'

     can inline a function with `target("sse2")', since `-msse3'

     implies `-msse2'.



My guess was that we were forcing the inlining (via always_inline) of a

function that has different target options.



But I guess that doesn't explain why it happens only in C++ and only in

optimising mode. Does always_inline inline on -O0 too?