https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97715
--- Comment #6 from qinzhao at gcc dot gnu.org --- (In reply to Jakub Jelinek from comment #3) > ;; Floating-point register constraints. > (define_register_constraint "f" > "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FLOAT_REGS : NO_REGS" > "Any 80387 floating-point (stack) register.") > > So, zero_all_st_registers really should just > if (!TARGET_80387 && !TARGET_FLOAT_RETURNS_IN_80387) > return false; > somewhere early. I can do this to avoid the ICE. however, the st/mm register set will NOT be zeroed under such situation when user requests to zero them with -fzero-call-used-regs=all.
