https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70873
--- Comment #25 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to H.J. Lu from comment #23) > We need to move those special SSE SF->DF splitters before No, this splitter will fail if the transformation doesn't result in a constant. So, we actually want this splitter first, to try to transform a memory load to a constant load, and moving others before this one would be harmful. > (define_split > [(set (match_operand 0 "any_fp_register_operand") > (float_extend (match_operand 1 "memory_operand")))] > "reload_completed > && (GET_MODE (operands[0]) == TFmode > || GET_MODE (operands[0]) == XFmode > || GET_MODE (operands[0]) == DFmode)" > [(set (match_dup 0) (match_dup 2))] > { > operands[2] = find_constant_src (curr_insn); > > if (operands[2] == NULL_RTX > || (SSE_REGNO_P (REGNO (operands[0])) > && standard_sse_constant_p (operands[2], > GET_MODE (operands[0])) != 1) > || (STACK_REGNO_P (REGNO (operands[0])) > && standard_80387_constant_p (operands[2]) < 1)) > FAIL; > })