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mn10300.c (count_tst_insns): New arg oreg_countp.

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* mn10300.c (count_tst_insns): New arg oreg_countp.  Callers changed.
        Simplify tests for clearing an address register.
        (expand_prologue): Corresponding changes.

From-SVN: r21215
This commit is contained in:
Jeffrey A Law 1998-07-16 14:10:24 +00:00 committed by Jeff Law
parent fed2012bae
commit 6673b2ea6a
2 changed files with 14 additions and 9 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
Thu Jul 16 14:48:47 1998 Jeffrey A Law (law@cygnus.com)
* mn10300.c (count_tst_insns): New arg oreg_countp. Callers changed.
Simplify tests for clearing an address register.
(expand_prologue): Corresponding changes.
* mn10300.md (movXX patterns): Make sure the destination is an
ADDRESS_REG when substituting "zero_areg" for (const_int 0).
(logical patterns): Split into expanders + patterns

19
gcc/config/mn10300/mn10300.c
View File

@ -382,15 +382,17 @@ can_use_return_insn ()
/* Count the number of tst insns which compare a data or address
register with zero. */
static void
count_tst_insns (dreg_countp, areg_countp)
count_tst_insns (dreg_countp, areg_countp, oreg_countp)
int *dreg_countp;
int *areg_countp;
int *oreg_countp;
{
rtx insn;
/* Assume no tst insns exist. */
*dreg_countp = 0;
*areg_countp = 0;
*oreg_countp = 0;
/* If not optimizing, then quit now. */
if (!optimize)
@ -424,8 +426,7 @@ count_tst_insns (dreg_countp, areg_countp)
/* Setting an address register to zero can also be optimized,
so count it just like a tst insn. */
if (GET_CODE (SET_DEST (pat)) == REG
&& GET_CODE (SET_SRC (pat)) == CONST_INT
&& INTVAL (SET_SRC (pat)) == 0
&& SET_SRC (pat) == CONST0_RTX (GET_MODE (SET_DEST (pat)))
&& REGNO_REG_CLASS (REGNO (SET_DEST (pat))) == ADDRESS_REGS)
(*areg_countp)++;
}
@ -447,16 +448,16 @@ expand_prologue ()
|| regs_ever_live[6] || regs_ever_live[7]
|| frame_pointer_needed)
{
int dreg_count, areg_count;
int dreg_count, areg_count, oreg_count;
/* Get a count of the number of tst insns which use address and
data registers. */
count_tst_insns (&dreg_count, &areg_count);
count_tst_insns (&dreg_count, &areg_count, &oreg_count);
/* If there's more than one tst insn using a data register, then
this optimization is a win. */
if (dreg_count > 1
&& (!regs_ever_live[2] || !regs_ever_live[3]))
if ((dreg_count > 1 || oreg_count > 1)
&& (!regs_ever_live[2] || !regs_ever_live[3]))
{
if (!regs_ever_live[2])
{
@ -474,8 +475,8 @@ expand_prologue ()
/* If there's more than two tst insns using an address register,
then this optimization is a win. */
if (areg_count > 2
&& (!regs_ever_live[6] || !regs_ever_live[7]))
if ((areg_count > 2 || oreg_count > 1)
&& (!regs_ever_live[6] || !regs_ever_live[7]))
{
if (!regs_ever_live[6])
{