From 0009eff2ef256211d6f4bf0126159ec77425e34d Mon Sep 17 00:00:00 2001 From: Richard Kenner Date: Mon, 30 Mar 1992 18:39:59 -0500 Subject: [PATCH] *** empty log message *** From-SVN: r641 --- gcc/reload1.c | 137 ++++++++++++++++++++++++-------------------------- 1 file changed, 67 insertions(+), 70 deletions(-) diff --git a/gcc/reload1.c b/gcc/reload1.c index b94c453c95f..fea5758eacb 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -5424,9 +5424,9 @@ gen_input_reload (reloadreg, in, before_insn) is recognized and matches its constraints. If so, it can be used. It might be better not to actually emit the insn unless it is valid, - but we need to pass the insn as an operand to `recog' and it is - simpler to emit and then delete the insn if not valid than to - dummy things up. */ + but we need to pass the insn as an operand to `recog' and + `insn_extract'and it is simpler to emit and then delete the insn if + not valid than to dummy things up. */ rtx move_operand, other_operand, insn; int code; @@ -5621,6 +5621,10 @@ inc_for_reload (reloadreg, value, inc_amount, insn) rtx incloc = XEXP (value, 0); /* Nonzero if increment after copying. */ int post = (GET_CODE (value) == POST_DEC || GET_CODE (value) == POST_INC); + rtx prev = PREV_INSN (insn); + rtx inc; + rtx add_insn; + int code; /* No hard register is equivalent to this register after inc/dec operation. If REG_LAST_RELOAD_REG were non-zero, @@ -5632,78 +5636,71 @@ inc_for_reload (reloadreg, value, inc_amount, insn) if (GET_CODE (value) == PRE_DEC || GET_CODE (value) == POST_DEC) inc_amount = - inc_amount; - /* First handle preincrement, which is simpler. */ - if (! post) + inc = gen_rtx (CONST_INT, VOIDmode, inc_amount); + + /* If this is post-increment, first copy the location to the reload reg. */ + if (post) + emit_insn_before (gen_move_insn (reloadreg, incloc), insn); + + /* See if we can directly increment INCLOC. Use a method similar to that + in gen_input_reload. */ + + add_insn = emit_insn_before (gen_rtx (SET, VOIDmode, incloc, + gen_rtx (PLUS, GET_MODE (incloc), + incloc, inc)), insn); + + code = recog_memoized (add_insn); + if (code >= 0) { - /* If incrementing a register, assume we can - output an insn to increment it directly. */ - if (GET_CODE (incloc) == REG - && (REGNO (incloc) < FIRST_PSEUDO_REGISTER - || reg_renumber[REGNO (incloc)] >= 0)) - { - rtx first_new - = emit_insn_before (gen_add2_insn (incloc, - gen_rtx (CONST_INT, VOIDmode, - inc_amount)), - insn); - emit_insn_before (gen_move_insn (reloadreg, incloc), insn); - return first_new; - } - else - /* Else we must not assume we can increment the location directly - (even though on many target machines we can); - copy it to the reload register, increment there, then save back. */ + insn_extract (add_insn); + if (constrain_operands (code, 1)) { - rtx first_new - = emit_insn_before (gen_move_insn (reloadreg, incloc), insn); - emit_insn_before (gen_add2_insn (reloadreg, - gen_rtx (CONST_INT, VOIDmode, - inc_amount)), - insn); - emit_insn_before (gen_move_insn (incloc, reloadreg), insn); - return first_new; + /* If this is a pre-increment and we have incremented the value + where it lives, copy the incremented value to RELOADREG to + be used as an address. */ + + if (! post) + emit_insn_before (gen_move_insn (reloadreg, incloc), insn); + return NEXT_INSN (prev); } } - /* Postincrement. - Because this might be a jump insn or a compare, and because RELOADREG - may not be available after the insn in an input reload, - we must do the incrementation before the insn being reloaded for. */ + + if (PREV_INSN (add_insn)) + NEXT_INSN (PREV_INSN (add_insn)) = NEXT_INSN (add_insn); + if (NEXT_INSN (add_insn)) + PREV_INSN (NEXT_INSN (add_insn)) = PREV_INSN (add_insn); + + /* If couldn't do the increment directly, must increment in RELOADREG. + The way we do this depends on whether this is pre- or post-increment. + For pre-increment, copy INCLOC to the reload register, increment it + there, then save back. */ + + if (! post) + { + emit_insn_before (gen_move_insn (reloadreg, incloc), insn); + emit_insn_before (gen_add2_insn (reloadreg, inc), insn); + emit_insn_before (gen_move_insn (incloc, reloadreg), insn); + } else { - /* Copy the value, then increment it. */ - rtx first_new - = emit_insn_before (gen_move_insn (reloadreg, incloc), insn); - - /* If incrementing a register, assume we can - output an insn to increment it directly. */ - if (GET_CODE (incloc) == REG - && (REGNO (incloc) < FIRST_PSEUDO_REGISTER - || reg_renumber[REGNO (incloc)] >= 0)) - { - emit_insn_before (gen_add2_insn (incloc, - gen_rtx (CONST_INT, VOIDmode, - inc_amount)), - insn); - } - else - /* Else we must not assume we can increment INCLOC - (even though on many target machines we can); - increment the copy in the reload register, - save that back, then decrement the reload register - so it has the original value. */ - { - emit_insn_before (gen_add2_insn (reloadreg, - gen_rtx (CONST_INT, VOIDmode, - inc_amount)), - insn); - emit_insn_before (gen_move_insn (incloc, reloadreg), insn); - emit_insn_before (gen_add2_insn (reloadreg, - gen_rtx (CONST_INT, VOIDmode, - -inc_amount)), - insn); - } - return first_new; + /* Postincrement. + Because this might be a jump insn or a compare, and because RELOADREG + may not be available after the insn in an input reload, we must do + the incrementation before the insn being reloaded for. + + We have already copied INCLOC to RELOADREG. Increment the copy in + RELOADREG, save that back, then decrement RELOADREG so it has + the original value. */ + + emit_insn_before (gen_add2_insn (reloadreg, inc), insn); + emit_insn_before (gen_move_insn (incloc, reloadreg), insn); + emit_insn_before (gen_add2_insn (reloadreg, + gen_rtx (CONST_INT, VOIDmode, + -inc_amount)), + insn); } + + return NEXT_INSN (prev); } /* Return 1 if we are certain that the constraint-string STRING allows @@ -5743,9 +5740,9 @@ constraint_accepts_reg_p (string, reg) default: /* Any reg in specified class wins for this alternative. */ { - int class = REG_CLASS_FROM_LETTER (c); + enum reg_class class = REG_CLASS_FROM_LETTER (c); - if (TEST_HARD_REG_BIT (reg_class_contents[class], regno)) + if (TEST_HARD_REG_BIT (reg_class_contents[(int) class], regno)) value = 1; } } -- 2.30.2