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rtlanal.c (rtx_varies_p): Volatile asms vary.

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* rtlanal.c (rtx_varies_p): Volatile asms vary.
	(rtx_unstable_p): Restructure code.  Volatile asms
	are unstable.

From-SVN: r36462
This commit is contained in:
John Wehle 2000-09-16 23:38:20 +00:00 • committed by John Wehle
parent f93dacbdef
commit ae0fb1b9fb
2 changed files with 39 additions and 11 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Sat Sep 16 19:42:50 EDT 2000 John Wehle (john@feith.com)
* rtlanal.c (rtx_varies_p): Volatile asms vary.
(rtx_unstable_p): Restructure code. Volatile asms
are unstable.
Sat Sep 16 14:35:55 2000 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* stor-layout.c (place_field): Don't do anything if field or

44
gcc/rtlanal.c
View file

@ -52,20 +52,36 @@ rtx_unstable_p (x)
register int i;
register const char *fmt;
if (code == MEM)
return ! RTX_UNCHANGING_P (x) || rtx_unstable_p (XEXP (x, 0));
switch (code)
{
case MEM:
return ! RTX_UNCHANGING_P (x) || rtx_unstable_p (XEXP (x, 0));
if (code == QUEUED)
return 1;
case QUEUED:
return 1;
if (CONSTANT_P (x))
return 0;
case CONST:
case CONST_INT:
case CONST_DOUBLE:
case SYMBOL_REF:
case LABEL_REF:
return 0;
if (code == REG)
/* As in rtx_varies_p, we have to use the actual rtx, not reg number. */
return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
|| x == arg_pointer_rtx || x == pic_offset_table_rtx
|| RTX_UNCHANGING_P (x));
case REG:
/* As in rtx_varies_p, we have to use the actual rtx, not reg number. */
return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
|| x == arg_pointer_rtx || x == pic_offset_table_rtx
|| RTX_UNCHANGING_P (x));
case ASM_OPERANDS:
if (MEM_VOLATILE_P (x))
return 1;
/* FALLTHROUGH */
default:
break;
}
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
@ -126,6 +142,12 @@ rtx_varies_p (x)
(in fact is it related specifically to operand 1). */
return rtx_varies_p (XEXP (x, 1));
case ASM_OPERANDS:
if (MEM_VOLATILE_P (x))
return 1;
/* FALLTHROUGH */
default:
break;
}