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jump.c (jump_optimize_1): Do cmov opt on any single-set; force B into a register before emit_conditional_move.

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* jump.c (jump_optimize_1): Do cmov opt on any single-set; force
        B into a register before emit_conditional_move.

From-SVN: r28830
This commit is contained in:
Richard Henderson 1999-08-24 17:00:03 -07:00 committed by Richard Henderson
parent abe4f192b7
commit 1f081ffb7d
2 changed files with 31 additions and 7 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Tue Aug 24 16:58:15 1999 Richard Henderson <rth@cygnus.com>
* jump.c (jump_optimize_1): Do cmov opt on any single-set; force
B into a register before emit_conditional_move.
Tue Aug 24 15:37:03 1999 Richard Henderson <rth@cygnus.com>
* fold-const.c (fold): Reassociate (+ (+ (* a b) c) (* d e))

33
gcc/jump.c
View File

@ -874,12 +874,13 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
INSN here is the jump around the store. We set:
TEMP to the "x = b;" insn.
TEMP to the "x op= b;" insn.
TEMP1 to X.
TEMP2 to B.
TEMP3 to A (X in the second case).
TEMP4 to the condition being tested.
TEMP5 to the earliest insn used to find the condition. */
TEMP5 to the earliest insn used to find the condition.
TEMP6 to the SET of TEMP. */
if (/* We can't do this after reload has completed. */
! reload_completed
@ -887,11 +888,11 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
/* Set TEMP to the "x = b;" insn. */
&& (temp = next_nonnote_insn (insn)) != 0
&& GET_CODE (temp) == INSN
&& GET_CODE (PATTERN (temp)) == SET
&& GET_CODE (temp1 = SET_DEST (PATTERN (temp))) == REG
&& (temp6 = single_set (temp)) != NULL_RTX
&& GET_CODE (temp1 = SET_DEST (temp6)) == REG
&& (! SMALL_REGISTER_CLASSES
|| REGNO (temp1) >= FIRST_PSEUDO_REGISTER)
&& ! side_effects_p (temp2 = SET_SRC (PATTERN (temp)))
&& ! side_effects_p (temp2 = SET_SRC (temp6))
&& ! may_trap_p (temp2)
/* Allow either form, but prefer the former if both apply.
There is no point in using the old value of TEMP1 if
@ -936,7 +937,7 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
enum rtx_code code = GET_CODE (temp4);
rtx var = temp1;
rtx cond0, cond1, aval, bval;
rtx target;
rtx target, new_insn;
/* Copy the compared variables into cond0 and cond1, so that
any side effects performed in or after the old comparison,
@ -955,10 +956,28 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
else
cond1 = gen_reg_rtx (GET_MODE (XEXP (temp4, 1)));
/* Careful about copying these values -- an IOR or what may
need to do other things, like clobber flags. */
/* ??? Assume for the moment that AVAL is ok. */
aval = temp3;
bval = temp2;
start_sequence ();
/* If we're not dealing with a register or the insn is more
complex than a simple SET, duplicate the computation and
replace the destination with a new temporary. */
if (register_operand (temp2, GET_MODE (var))
&& GET_CODE (PATTERN (temp)) == SET)
bval = temp2;
else
{
bval = gen_reg_rtx (GET_MODE (var));
new_insn = copy_rtx (temp);
temp6 = single_set (new_insn);
SET_DEST (temp6) = bval;
emit_insn (PATTERN (new_insn));
}
target = emit_conditional_move (var, code,
cond0, cond1, VOIDmode,
aval, bval, GET_MODE (var),