(define_insn "" [(set (match_operand:CCFP 0 "register_operand" "=z") (match_operator:SF 1 "signed_comparison_operator" [(match_operand:SF 2 "register_operand" "f") (match_operand:SF 3 "register_operand" "f")]))] "" "%C1f\\t%2,%3" [(set_attr "type" "fp") (set_attr "mode" "SF")])This pattern outputs float compare instruction. "%C" in the output template is defined in dlx.c to be one of eq, ne, gt, lt, le and neq. DLX's assembly code for float compare has the format of "*f op1, op2", where * is to be substituted by eq, ne, gt, .... I don't know the meaning of the numeric character "1" between "%C" and "f" in the output template.
It means that operand 1 (the signed_comparison_operator) is passed to the dlx.c routine. Likewise for %2 and %3.
Attached is DLX's md file.
The whole content of the file is not relevant. Paolo
