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(modified_between_p): Handle vectors. 

(modified_in_p): New function.
(refers_to_regno_p): If setting AP, FP, or SP, we clobber the virtual
registers.

From-SVN: r5267
This commit is contained in:
Richard Kenner 1993-09-06 13:27:22 -04:00
parent 966963e68b
commit f8163c9219
1 changed files with 74 additions and 4 deletions
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78
gcc/rtlanal.c
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@ -1,5 +1,5 @@
/* Analyze RTL for C-Compiler
Copyright (C) 1987, 1988, 1991, 1992 Free Software Foundation, Inc.
Copyright (C) 1987, 1988, 1991, 1992, 1993 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -472,7 +472,7 @@ modified_between_p (x, start, end)
{
enum rtx_code code = GET_CODE (x);
char *fmt;
int i;
int i, j;
switch (code)
{
@ -500,10 +500,68 @@ modified_between_p (x, start, end)
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
if (fmt[i] == 'e'
&& modified_between_p (XEXP (x, i), start, end))
{
if (fmt[i] == 'e' && modified_between_p (XEXP (x, i), start, end))
return 1;
if (fmt[i] == 'E')
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
if (modified_between_p (XVECEXP (x, i, j), start, end))
return 1;
}
return 0;
}
/* Similar to reg_set_p, but check all registers in X. Return 0 only if none
of them are modified in INSN. Return 1 if X contains a MEM; this routine
does not perform any memory aliasing. */
int
modified_in_p (x, insn)
rtx x;
rtx insn;
{
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:
return 0;
case PC:
case CC0:
return 1;
case MEM:
/* If the memory is not constant, assume it is modified. If it is
constant, we still have to check the address. */
if (! RTX_UNCHANGING_P (x))
return 1;
break;
case REG:
return reg_set_p (x, insn);
}
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
{
if (fmt[i] == 'e' && modified_in_p (XEXP (x, i), insn))
return 1;
if (fmt[i] == 'E')
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
if (modified_in_p (XVECEXP (x, i, j), insn))
return 1;
}
return 0;
}
@ -618,6 +676,18 @@ refers_to_regno_p (regno, endregno, x, loc)
{
case REG:
i = REGNO (x);
/* If we modifying the stack, frame, or argument pointer, it will
clobber a virtual register. In fact, we could be more precise,
but it isn't worth it. */
if ((i == STACK_POINTER_REGNUM
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|| i == ARG_POINTER_REGNUM
#endif
|| i == FRAME_POINTER_REGNUM)
&& regno >= FIRST_VIRTUAL_REGISTER && regno <= LAST_VIRTUAL_REGISTER)
return 1;
return (endregno > i
&& regno < i + (i < FIRST_PSEUDO_REGISTER
? HARD_REGNO_NREGS (i, GET_MODE (x))