http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55147



--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-11-01 
09:44:22 UTC ---

Created attachment 28589

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28589

gcc48-pr55147.patch



So like this?  Or do you want to merge the bswap{si,di}2 expanders using SWI48

iterator too?  That would make i386.md tiny bit shorter, but would make

gen_bswapdi2 longer (as the compiler can't figure out that for DImode (thus

TARGET_64BIT) TARGET_BSWAP is always true).  Perhaps I could do

  else if (<MODE>mode == DImode || TARGET_BSWAP)

so that at least optimized gcc builds would optimize it away.

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