http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49847
--- Comment #17 from Mikael Pettersson <mikpe at it dot uu.se> 2012-02-29 19:13:12 UTC --- (In reply to comment #16) > Created attachment 26757 [details] > make fold_rtx handle prev_insn_cc0 == NULL > > The effect of Richard Guenther's r180192 patch to tree-eh.c is that "g >= 0.0" > (or its gimple equivalent) is recognized as potentially trapping, which causes > the cc0 setter and user to be put in separate BBs. That's usually a no-no, > but > in the case of EH I'm not sure it can be avoided. Then as fold_rtx processes > the cc0 user at the start of the second BB, prev_insn_cc0 is NULL causing > equiv_constant to crash. > > With the attached patch fold_rtx simply doesn't try to fold the current rtx > when prev_insn_cc0 is NULL. A build of 4.7-20120225 as a cross to m68k-linux > with java enabled succeeded with this patch applied, and it handled Andreas' > c++ test case too. I'm currently attempting a native bootstrap with both java > and ada enabled. The native bootstrap succeeded.
