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rtlanal.c (regs_set_between_p): New function.

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* rtlanal.c (regs_set_between_p): New function.
        * rtl.h (regs_set_between_p): Prototype it.
        * jump.c (jump_optimize): Use it instead of modified_between_p
        in the Sep 2 change.

From-SVN: r23888
This commit is contained in:
Richard Henderson 1998-11-25 16:21:27 -08:00 committed by Richard Henderson
parent 8357595779
commit a2e1a0bf9e
4 changed files with 56 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
Thu Nov 26 00:19:19 1998 Richard Henderson <rth@cygnus.com>
* rtlanal.c (regs_set_between_p): New function.
* rtl.h (regs_set_between_p): Prototype it.
* jump.c (jump_optimize): Use it instead of modified_between_p
in the Sep 2 change.
Wed Nov 25 23:32:02 1998 Ian Dall <Ian.Dall@dsto.defence.gov.au>
Matthias Pfaller <leo@dachau.marco.de>

4
gcc/jump.c
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@ -521,7 +521,7 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
|| ! modified_between_p (SET_SRC (temp4), p, temp2))
/* Verify that registers used by the jump are not clobbered
by the instruction being moved. */
&& ! modified_between_p (PATTERN (temp), temp2,
&& ! regs_set_between_p (PATTERN (temp), temp2,
NEXT_INSN (temp2)))
{
emit_insn_after_with_line_notes (PATTERN (temp2), p, temp2);
@ -622,7 +622,7 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
&& ! modified_between_p (SET_SRC (temp4), insert_after, temp)
/* Verify that registers used by the jump are not clobbered
by the instruction being moved. */
&& ! modified_between_p (PATTERN (temp), temp3,
&& ! regs_set_between_p (PATTERN (temp), temp3,
NEXT_INSN (temp3))
&& invert_jump (temp, JUMP_LABEL (insn)))
{

1
gcc/rtl.h
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@ -982,6 +982,7 @@ extern int reg_referenced_p PROTO((rtx, rtx));
extern int reg_used_between_p PROTO((rtx, rtx, rtx));
extern int reg_referenced_between_p PROTO((rtx, rtx, rtx));
extern int reg_set_between_p PROTO((rtx, rtx, rtx));
extern int regs_set_between_p PROTO((rtx, rtx, rtx));
extern int modified_between_p PROTO((rtx, rtx, rtx));
extern int no_labels_between_p PROTO((rtx, rtx));
extern int modified_in_p PROTO((rtx, rtx));

46
gcc/rtlanal.c
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@ -499,6 +499,52 @@ reg_set_p (reg, insn)
return reg_set_flag;
}
/* Similar to reg_set_between_p, but check all registers in X. Return 0
only if none of them are modified between START and END. Do not
consider non-registers one way or the other. */
int
regs_set_between_p (x, start, end)
rtx x;
rtx start, end;
{
enum rtx_code code = GET_CODE (x);
char *fmt;
int i, j;
switch (code)
{
case CONST_INT:
case CONST_DOUBLE:
case CONST:
case SYMBOL_REF:
case LABEL_REF:
case PC:
case CC0:
return 0;
case REG:
return reg_set_between_p (x, start, end);
default:
break;
}
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
{
if (fmt[i] == 'e' && regs_set_between_p (XEXP (x, i), start, end))
return 1;
else if (fmt[i] == 'E')
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
if (regs_set_between_p (XVECEXP (x, i, j), start, end))
return 1;
}
return 0;
}
/* Similar to reg_set_between_p, but check all registers in X. Return 0
only if none of them are modified between START and END. Return 1 if
X contains a MEM; this routine does not perform any memory aliasing. */