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(expand_divmod): When adjusting op0 for trunc_div or trunc_mod... 

(expand_divmod): When adjusting op0 for trunc_div or
trunc_mod, using shifts (not branches), make a new pseudo for the
result.  Don't use target for adjusted_op0.

From-SVN: r4081
This commit is contained in:
Richard Stallman 1993-04-11 08:08:54 +00:00
parent 52266016a2
commit f2dd837227
1 changed files with 17 additions and 9 deletions
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26
gcc/expmed.c
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@ -2359,14 +2359,6 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
case TRUNC_DIV_EXPR:
if (log >= 0 && ! unsignedp)
{
if (! can_clobber_op0)
{
adjusted_op0 = copy_to_suggested_reg (adjusted_op0, target,
compute_mode);
/* Copy op0 to a reg, since emit_cmp_insn will call emit_queue
which will screw up mem refs for autoincrements. */
op0 = force_reg (compute_mode, op0);
}
/* Here we need to add OP1-1 if OP0 is negative, 0 otherwise.
This can be computed without jumps by arithmetically shifting
OP0 right LOG-1 places and then shifting right logically
@ -2375,17 +2367,33 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
if (log == 1 || BRANCH_COST >= 3)
{
rtx temp = gen_reg_rtx (compute_mode);
if (! can_clobber_op0)
/* Copy op0 to a reg, to play safe,
since this is done in the other path. */
op0 = force_reg (compute_mode, op0);
temp = copy_to_suggested_reg (adjusted_op0, temp, compute_mode);
temp = expand_shift (RSHIFT_EXPR, compute_mode, temp,
build_int_2 (log - 1, 0), NULL_RTX, 0);
temp = expand_shift (RSHIFT_EXPR, compute_mode, temp,
build_int_2 (size - log, 0),
temp, 1);
expand_inc (adjusted_op0, temp);
/* We supply 0 as the target to make a new pseudo
for the value; that helps loop.c optimize the result. */
adjusted_op0 = expand_binop (compute_mode, add_optab,
adjusted_op0, temp,
0, 0, OPTAB_LIB_WIDEN);
}
else
{
rtx label = gen_label_rtx ();
if (! can_clobber_op0)
{
adjusted_op0 = copy_to_suggested_reg (adjusted_op0, target,
compute_mode);
/* Copy op0 to a reg, since emit_cmp_insn will call emit_queue
which will screw up mem refs for autoincrements. */
op0 = force_reg (compute_mode, op0);
}
emit_cmp_insn (adjusted_op0, const0_rtx, GE,
NULL_RTX, compute_mode, 0, 0);
emit_jump_insn (gen_bge (label));