diff options
Diffstat (limited to 'gcc/jump.c')
| -rwxr-xr-x | gcc/jump.c | 97 |
1 files changed, 0 insertions, 97 deletions
@@ -2212,102 +2212,6 @@ delete_noop_moves (f) register rtx body = PATTERN (insn); /* Combine stack_adjusts with following push_insns. */ -#ifdef PUSH_ROUNDING - if (GET_CODE (body) == SET - && SET_DEST (body) == stack_pointer_rtx - && GET_CODE (SET_SRC (body)) == PLUS - && XEXP (SET_SRC (body), 0) == stack_pointer_rtx - && GET_CODE (XEXP (SET_SRC (body), 1)) == CONST_INT - && INTVAL (XEXP (SET_SRC (body), 1)) > 0) - { - rtx p; - rtx stack_adjust_insn = insn; - int stack_adjust_amount = INTVAL (XEXP (SET_SRC (body), 1)); - int total_pushed = 0; - int pushes = 0; - - /* Find all successive push insns. */ - p = insn; - /* Don't convert more than three pushes; - that starts adding too many displaced addresses - and the whole thing starts becoming a losing - proposition. */ - while (pushes < 3) - { - rtx pbody, dest; - p = next_nonnote_insn (p); - if (p == 0 || GET_CODE (p) != INSN) - break; - pbody = PATTERN (p); - if (GET_CODE (pbody) != SET) - break; - dest = SET_DEST (pbody); - /* Allow a no-op move between the adjust and the push. */ - if (GET_CODE (dest) == REG - && GET_CODE (SET_SRC (pbody)) == REG - && REGNO (dest) == REGNO (SET_SRC (pbody))) - continue; - if (! (GET_CODE (dest) == MEM - && GET_CODE (XEXP (dest, 0)) == POST_INC - && XEXP (XEXP (dest, 0), 0) == stack_pointer_rtx)) - break; - pushes++; - if (total_pushed + GET_MODE_SIZE (GET_MODE (SET_DEST (pbody))) - > stack_adjust_amount) - break; - total_pushed += GET_MODE_SIZE (GET_MODE (SET_DEST (pbody))); - } - - /* Discard the amount pushed from the stack adjust; - maybe eliminate it entirely. */ - if (total_pushed >= stack_adjust_amount) - { - delete_computation (stack_adjust_insn); - total_pushed = stack_adjust_amount; - } - else - XEXP (SET_SRC (PATTERN (stack_adjust_insn)), 1) - = GEN_INT (stack_adjust_amount - total_pushed); - - /* Change the appropriate push insns to ordinary stores. */ - p = insn; - while (total_pushed > 0) - { - rtx pbody, dest; - p = next_nonnote_insn (p); - if (GET_CODE (p) != INSN) - break; - pbody = PATTERN (p); - if (GET_CODE (pbody) != SET) - break; - dest = SET_DEST (pbody); - /* Allow a no-op move between the adjust and the push. */ - if (GET_CODE (dest) == REG - && GET_CODE (SET_SRC (pbody)) == REG - && REGNO (dest) == REGNO (SET_SRC (pbody))) - continue; - if (! (GET_CODE (dest) == MEM - && GET_CODE (XEXP (dest, 0)) == POST_INC - && XEXP (XEXP (dest, 0), 0) == stack_pointer_rtx)) - break; - total_pushed -= GET_MODE_SIZE (GET_MODE (SET_DEST (pbody))); - /* If this push doesn't fully fit in the space - of the stack adjust that we deleted, - make another stack adjust here for what we - didn't use up. There should be peepholes - to recognize the resulting sequence of insns. */ - if (total_pushed < 0) - { - emit_insn_before (gen_add2_insn (stack_pointer_rtx, - GEN_INT (- total_pushed)), - p); - break; - } - XEXP (dest, 0) - = plus_constant (stack_pointer_rtx, total_pushed); - } - } -#endif /* Detect and delete no-op move instructions resulting from not allocating a parameter in a register. */ @@ -4695,7 +4599,6 @@ thread_jumps (f, max_reg, flag_before_loop) if (call_used_regs[i] && ! fixed_regs[i] && i != STACK_POINTER_REGNUM && i != FRAME_POINTER_REGNUM - && i != HARD_FRAME_POINTER_REGNUM && i != ARG_POINTER_REGNUM) modified_regs[i] = 1; } |