diff options
Diffstat (limited to 'gnu/usr.bin/cc/cc_int/caller-save.c')
| -rw-r--r-- | gnu/usr.bin/cc/cc_int/caller-save.c | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/gnu/usr.bin/cc/cc_int/caller-save.c b/gnu/usr.bin/cc/cc_int/caller-save.c index 5b09606..bcfe3c8 100644 --- a/gnu/usr.bin/cc/cc_int/caller-save.c +++ b/gnu/usr.bin/cc/cc_int/caller-save.c @@ -41,13 +41,13 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ register because it is live we first try to save in multi-register modes. If that is not possible the save is done one register at a time. */ -static enum machine_mode +static enum machine_mode regno_save_mode[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MAX_UNITS_PER_WORD + 1]; /* For each hard register, a place on the stack where it can be saved, if needed. */ -static rtx +static rtx regno_save_mem[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MAX_UNITS_PER_WORD + 1]; /* We will only make a register eligible for caller-save if it can be @@ -56,9 +56,9 @@ static rtx when we emit them, the addresses might not be valid, so they might not be recognized. */ -static enum insn_code +static enum insn_code reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MAX_UNITS_PER_WORD + 1]; -static enum insn_code +static enum insn_code reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MAX_UNITS_PER_WORD + 1]; /* Set of hard regs currently live (during scan of all insns). */ @@ -88,7 +88,7 @@ static int insert_save_restore PROTO((rtx, int, int, Look at all the hard registers that are used by a call and for which regclass.c has not already excluded from being used across a call. - Ensure that we can find a mode to save the register and that there is a + Ensure that we can find a mode to save the register and that there is a simple insn to save and restore the register. This latter check avoids problems that would occur if we tried to save the MQ register of some machines directly into memory. */ @@ -230,18 +230,18 @@ init_save_areas () We assume that our caller has set up the elimination table to the worst (largest) possible offsets. - Set *PCHANGED to 1 if we had to allocate some memory for the save area. + Set *PCHANGED to 1 if we had to allocate some memory for the save area. Future work: In the fallback case we should iterate backwards across all possible - modes for the save, choosing the largest available one instead of + modes for the save, choosing the largest available one instead of falling back to the smallest mode immediately. (eg TF -> DF -> SF). We do not try to use "move multiple" instructions that exist - on some machines (such as the 68k moveml). It could be a win to try + on some machines (such as the 68k moveml). It could be a win to try and use them when possible. The hard part is doing it in a way that is - machine independent since they might be saving non-consecutive + machine independent since they might be saving non-consecutive registers. (imagine caller-saving d0,d1,a0,a1 on the 68k) */ int @@ -263,13 +263,13 @@ setup_save_areas (pchanged) if (reg_renumber[i] >= 0 && reg_n_calls_crossed[i] > 0) { int regno = reg_renumber[i]; - int endregno + int endregno = regno + HARD_REGNO_NREGS (regno, GET_MODE (regno_reg_rtx[i])); int nregs = endregno - regno; for (j = 0; j < nregs; j++) { - if (call_used_regs[regno+j]) + if (call_used_regs[regno+j]) SET_HARD_REG_BIT (hard_regs_used, regno+j); } } @@ -319,10 +319,10 @@ setup_save_areas (pchanged) { /* This should not depend on WORDS_BIG_ENDIAN. The order of words in regs is the same as in memory. */ - rtx temp = gen_rtx (MEM, regno_save_mode[i+k][1], + rtx temp = gen_rtx (MEM, regno_save_mode[i+k][1], XEXP (regno_save_mem[i][j], 0)); - regno_save_mem[i+k][1] + regno_save_mem[i+k][1] = adj_offsettable_operand (temp, k * UNITS_PER_WORD); } *pchanged = 1; @@ -425,7 +425,7 @@ save_call_clobbered_regs (insn_mode) test at this point because registers that die in a CALL_INSN are not live across the call and likewise for registers that are born in the CALL_INSN. - + If registers are filled with parameters for this function, and some of these are also being set by this function, then they will not appear to die (no REG_DEAD note for them), @@ -457,7 +457,7 @@ save_call_clobbered_regs (insn_mode) /* It must not be set by this instruction. */ && ! TEST_HARD_REG_BIT (this_call_sets, regno) && ! TEST_HARD_REG_BIT (hard_regs_saved, regno)) - regno += insert_save_restore (insn, 1, regno, + regno += insert_save_restore (insn, 1, regno, insn_mode, 0); /* Put the information for this CALL_INSN on top of what @@ -555,7 +555,7 @@ clear_reg_live (reg) CLEAR_HARD_REG_BIT (hard_regs_need_restore, i); CLEAR_HARD_REG_BIT (hard_regs_saved, i); } -} +} /* If any register currently residing in the save area is referenced in X, which is part of INSN, emit code to restore the register in front of INSN. @@ -608,7 +608,7 @@ restore_referenced_regs (x, insn, insn_mode) return; } - + fmt = GET_RTX_FORMAT (code); for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) { @@ -674,7 +674,7 @@ insert_save_restore (insn, save_p, regno, insn_mode, maxrestore) int i, j, k; int ok; - /* See if we can save several registers with a single instruction. + /* See if we can save several registers with a single instruction. Work backwards to the single register case. */ for (i = MOVE_MAX / UNITS_PER_WORD; i > 0; i--) { @@ -687,7 +687,7 @@ insert_save_restore (insn, save_p, regno, insn_mode, maxrestore) || TEST_HARD_REG_BIT (hard_regs_saved, regno + j)) ok = 0; } - else + else continue; /* Must do this one save at a time */ @@ -732,10 +732,10 @@ insert_save_restore (insn, save_p, regno, insn_mode, maxrestore) /* Must do this one restore at a time */ if (! ok) continue; - + pat = gen_rtx (SET, VOIDmode, - gen_rtx (REG, GET_MODE (regno_save_mem[regno][i]), - regno), + gen_rtx (REG, GET_MODE (regno_save_mem[regno][i]), + regno), regno_save_mem[regno][i]); code = reg_restore_code[regno][i]; |
