[Bug rtl-optimization/56571] [4.7/4.8 Regression] ICE in copyprop_hardreg_forward_1, at regcprop.c (insn does not satisfy its constraints !)

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56571

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-03-08 16:06:33 UTC ---
Ok, it seems to be caused by rtl sharing of the clobber, which has been
introduced by Honza: http://gcc.gnu.org/ml/gcc-patches/2004-01/msg01918.html
Honza is going to try sharing only clobbers of hard regs that don't have
ORIGINAL_REGNO set on them and disallow sharing anything else (plus copy it on
copy_rtx etc.).