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(output_stack_adjust): Reorganize code for readability. 

If size is negative, negate and subtract it instead of adding it.

From-SVN: r13847
This commit is contained in:
Jim Wilson 1997-04-09 15:44:46 -07:00
parent 20ec31d305
commit f3cd53755b
1 changed files with 29 additions and 25 deletions
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54
gcc/config/sh/sh.c
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@ -2485,38 +2485,42 @@ output_stack_adjust (size, reg, temp)
{
if (size)
{
rtx val = GEN_INT (size);
rtx insn;
if (! CONST_OK_FOR_I (size))
if (CONST_OK_FOR_I (size))
emit_insn (gen_addsi3 (reg, reg, GEN_INT (size)));
/* Try to do it with two partial adjustments; however, we must make
sure that the stack is properly aligned at all times, in case
an interrupt occurs between the two partial adjustments. */
else if (CONST_OK_FOR_I (size / 2 & -4)
&& CONST_OK_FOR_I (size - (size / 2 & -4)))
{
/* Try to do it with two partial adjustments; however, must make
sure that the stack is properly aligned at all times, in case
an interrupt occurs between the two partial adjustments. */
if (CONST_OK_FOR_I (size / 2 & -4)
&& CONST_OK_FOR_I (size - (size / 2 & -4)))
emit_insn (gen_addsi3 (reg, reg, GEN_INT (size / 2 & -4)));
emit_insn (gen_addsi3 (reg, reg, GEN_INT (size - (size / 2 & -4))));
}
else
{
rtx const_reg;
/* If TEMP is invalid, we could temporarily save a general
register to MACL. However, there is currently no need
to handle this case, so just abort when we see it. */
if (temp < 0)
abort ();
const_reg = gen_rtx (REG, SImode, temp);
/* If SIZE is negative, subtract the positive value.
This sometimes allows a constant pool entry to be shared
between prologue and epilogue code. */
if (size < 0)
{
val = GEN_INT (size / 2 & -4);
emit_insn (gen_addsi3 (reg, reg, val));
val = GEN_INT (size - (size / 2 & -4));
emit_insn (gen_movsi (const_reg, GEN_INT (-size)));
emit_insn (gen_subsi3 (reg, reg, const_reg));
}
else
{
rtx reg;
/* If TEMP is invalid, we could temporarily save a general
register to MACL. However, there is currently no need
to handle this case, so just abort when we see it. */
if (temp < 0)
abort ();
reg = gen_rtx (REG, SImode, temp);
emit_insn (gen_movsi (reg, val));
val = reg;
emit_insn (gen_movsi (const_reg, GEN_INT (size)));
emit_insn (gen_addsi3 (reg, reg, const_reg));
}
}
insn = gen_addsi3 (reg, reg, val);
emit_insn (insn);
}
}