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reload1.c (eliminate_regs_in_insn): Recognize frame pointer adjustments even if...

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* reload1.c (eliminate_regs_in_insn): Recognize frame pointer
adjustments even if they are implemented by more than two insns.

From-SVN: r49221
This commit is contained in:
Ulrich Weigand 2002-01-25 20:22:31 +00:00 committed by Ulrich Weigand
parent 5a133afd40
commit 75eefe3fe0
2 changed files with 27 additions and 28 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-01-25 Ulrich Weigand <uweigand@de.ibm.com>
* reload1.c (eliminate_regs_in_insn): Recognize frame pointer
adjustments even if they are implemented by more than two insns.
Fri Jan 25 20:43:56 CET 2002 Jan Hubicka <jh@suse.cz>
* df.c (df_ref_create, df_ref_record_1, df_ref_record): Kill BB argument.

50
gcc/reload1.c
View File

@ -2932,38 +2932,32 @@ eliminate_regs_in_insn (insn, replace)
if (ep->from == FRAME_POINTER_REGNUM
&& ep->to == HARD_FRAME_POINTER_REGNUM)
{
rtx src = SET_SRC (old_set);
int offset = 0, ok = 0;
rtx prev_insn, prev_set;
rtx base = SET_SRC (old_set);
rtx base_insn = insn;
int offset = 0;
if (src == ep->to_rtx)
offset = 0, ok = 1;
else if (GET_CODE (src) == PLUS
&& GET_CODE (XEXP (src, 0)) == CONST_INT
&& XEXP (src, 1) == ep->to_rtx)
offset = INTVAL (XEXP (src, 0)), ok = 1;
else if (GET_CODE (src) == PLUS
&& GET_CODE (XEXP (src, 1)) == CONST_INT
&& XEXP (src, 0) == ep->to_rtx)
offset = INTVAL (XEXP (src, 1)), ok = 1;
else if ((prev_insn = prev_nonnote_insn (insn)) != 0
&& (prev_set = single_set (prev_insn)) != 0
&& rtx_equal_p (SET_DEST (prev_set), src))
while (base != ep->to_rtx)
{
src = SET_SRC (prev_set);
if (src == ep->to_rtx)
offset = 0, ok = 1;
else if (GET_CODE (src) == PLUS
&& GET_CODE (XEXP (src, 0)) == CONST_INT
&& XEXP (src, 1) == ep->to_rtx)
offset = INTVAL (XEXP (src, 0)), ok = 1;
else if (GET_CODE (src) == PLUS
&& GET_CODE (XEXP (src, 1)) == CONST_INT
&& XEXP (src, 0) == ep->to_rtx)
offset = INTVAL (XEXP (src, 1)), ok = 1;
rtx prev_insn, prev_set;
if (GET_CODE (base) == PLUS
&& GET_CODE (XEXP (base, 1)) == CONST_INT)
{
offset += INTVAL (XEXP (base, 1));
base = XEXP (base, 0);
}
else if ((prev_insn = prev_nonnote_insn (base_insn)) != 0
&& (prev_set = single_set (prev_insn)) != 0
&& rtx_equal_p (SET_DEST (prev_set), base))
{
base = SET_SRC (prev_set);
base_insn = prev_insn;
}
else
break;
}
if (ok)
if (base == ep->to_rtx)
{
rtx src
= plus_constant (ep->to_rtx, offset - ep->offset);