https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65240
--- Comment #12 from Michael Meissner <meissner at gcc dot gnu.org> --- Created attachment 34952 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34952&action=edit Initial patch to paper over the problem This patch papers over the problem. As I mentioned before this is an interaction between -ffast-math and -mupper-regs-df. I was able to replicate it for both power7 and power8 targets, and turning off either -ffast-math or -mupper-regs-df allowed the problem to compile. I suspect that the logic in easy_fp_constant to keep the CONST_DOUBLE around to reload time is no longer needed, and that reciprocal approximation does not need the constant in the RTL, but uses the register notes.
