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* h8300.c (split_adds_subs): Rearrange code for conciseness.

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From-SVN: r35371
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Kazu Hirata 2000-07-31 12:44:28 +00:00 committed by Jeff Law
parent 91f9a498c4
commit 9492393e34
2 changed files with 21 additions and 47 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2000-07-31 Kazu Hirata <kazu@hxi.com>
* h8300.c (split_adds_subs): Rearrange code for conciseness.
Mon Jul 31 12:27:55 MET DST 2000 Jan Hubicka <jh@suse.cz>
* i386.md (addsi to lea splitter, ashlqi3_1_lea): Fix bugs

64
gcc/config/h8300/h8300.c
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@ -682,61 +682,31 @@ split_adds_subs (mode, operands)
{
HOST_WIDE_INT val = INTVAL (operands[1]);
rtx reg = operands[0];
rtx tmp;
HOST_WIDE_INT sign = 1;
HOST_WIDE_INT amount;
/* Take care of +/- 4 for H8300H and H8300S. */
if (TARGET_H8300H || TARGET_H8300S)
/* Force VAL to be positive so that we do not have to consider the
sign. */
if (val < 0)
{
/* Get the value in range of +/- 4. */
if (val > 4)
{
tmp = gen_rtx_PLUS (mode, reg, GEN_INT (4));
emit_insn (gen_rtx_SET (VOIDmode, reg, tmp));
val -= 4;
}
else if (val < -4)
{
tmp = gen_rtx_PLUS (mode, reg, GEN_INT (-4));
emit_insn (gen_rtx_SET (VOIDmode, reg, tmp));
val += 4;
}
val = -val;
sign = -1;
}
if (val == 4 || val == -4)
/* Try different amounts in descending order. */
for (amount = (TARGET_H8300H || TARGET_H8300S) ? 4 : 2;
amount > 0;
amount /= 2)
{
while (val >= amount)
{
tmp = gen_rtx_PLUS (mode, reg, GEN_INT (val));
rtx tmp = gen_rtx_PLUS (mode, reg, GEN_INT (sign * amount));
emit_insn (gen_rtx_SET (VOIDmode, reg, tmp));
return;
val -= amount;
}
}
/* Get the value in range of +/- 2. */
if (val > 2)
{
tmp = gen_rtx_PLUS (mode, reg, GEN_INT (2));
emit_insn (gen_rtx_SET (VOIDmode, reg, tmp));
val -= 2;
}
else if (val < -2)
{
tmp = gen_rtx_PLUS (mode, reg, GEN_INT (-2));
emit_insn (gen_rtx_SET (VOIDmode, reg, tmp));
val += 2;
}
/* If not optimizing, we might be asked to add 0. */
if (val == 0)
return;
/* We should have one or two now. */
if (val >= -2 && val <= 2)
{
tmp = gen_rtx_PLUS (mode, reg, GEN_INT (val));
emit_insn (gen_rtx_SET (VOIDmode, reg, tmp));
return;
}
/* In theory, this can't happen. */
abort ();
return;
}
/* Return true if OP is a valid call operand, and OP represents