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m32c.c (m32c_prepare_shift): Add code to deal with the 16 bit shift limit of the m16c. 

* config/m32c/m32c.c (m32c_prepare_shift): Add code to deal with
the 16 bit shift limit of the m16c.

From-SVN: r109987
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DJ Delorie 2006-01-19 18:18:57 -05:00 committed by DJ Delorie
parent 360e875934
commit 2e16005633
2 changed files with 69 additions and 4 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2006-01-19 DJ Delorie <dj@redhat.com>
* config/m32c/m32c.c (m32c_prepare_shift): Add code to deal with
the 16 bit shift limit of the m16c.
2006-01-19 Andrew Pinski <pinskia@physics.uc.edu>
PR target/22099

68
gcc/config/m32c/m32c.c
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@ -2891,13 +2891,73 @@ m32c_prepare_shift (rtx * operands, int scale, int shift_code)
emit_insn (func (operands[0], operands[1], GEN_INT (count)));
return 1;
}
temp = gen_reg_rtx (QImode);
if (scale < 0)
{
temp = gen_reg_rtx (QImode);
emit_move_insn (temp, gen_rtx_NEG (QImode, operands[2]));
}
/* The pattern has a NEG that corresponds to this. */
emit_move_insn (temp, gen_rtx_NEG (QImode, operands[2]));
else if (TARGET_A16 && mode == SImode)
/* We do this because the code below may modify this, we don't
want to modify the origin of this value. */
emit_move_insn (temp, operands[2]);
else
/* We'll only use it for the shift, no point emitting a move. */
temp = operands[2];
if (TARGET_A16 && mode == SImode)
{
/* The m16c has a limit of -16..16 for SI shifts, even when the
shift count is in a register. Since there are so many targets
of these shifts, it's better to expand the RTL here than to
call a helper function.
The resulting code looks something like this:
cmp.b r1h,-16
jge.b 1f
shl.l -16,dest
add.b r1h,16
1f: cmp.b r1h,16
jle.b 1f
shl.l 16,dest
sub.b r1h,16
1f: shl.l r1h,dest
We take advantage of the fact that "negative" shifts are
undefined to skip one of the comparisons. */
rtx count;
rtx label, lref, insn;
count = temp;
label = gen_label_rtx ();
lref = gen_rtx_LABEL_REF (VOIDmode, label);
LABEL_NUSES (label) ++;
if (shift_code == ASHIFT)
{
/* This is a left shift. We only need check positive counts. */
emit_jump_insn (gen_cbranchqi4 (gen_rtx_LE (VOIDmode, 0, 0),
count, GEN_INT (16), label));
emit_insn (func (operands[1], operands[1], GEN_INT (8)));
emit_insn (func (operands[1], operands[1], GEN_INT (8)));
insn = emit_insn (gen_addqi3 (count, count, GEN_INT (-16)));
emit_label_after (label, insn);
}
else
{
/* This is a right shift. We only need check negative counts. */
emit_jump_insn (gen_cbranchqi4 (gen_rtx_GE (VOIDmode, 0, 0),
count, GEN_INT (-16), label));
emit_insn (func (operands[1], operands[1], GEN_INT (-8)));
emit_insn (func (operands[1], operands[1], GEN_INT (-8)));
insn = emit_insn (gen_addqi3 (count, count, GEN_INT (16)));
emit_label_after (label, insn);
}
}
operands[2] = temp;
return 0;
}