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Use push_operand to check for changes to the stack pointer

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From-SVN: r13975
This commit is contained in:
Ian Lance Taylor 1997-04-24 03:09:29 +00:00
parent 173cd503de
commit 9e148ceb90
1 changed files with 19 additions and 2 deletions
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21
gcc/reload1.c
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@ -7600,7 +7600,7 @@ reload_cse_invalidate_regno (regno, mode, clobber)
for (x = reg_values[i]; x; x = XEXP (x, 1))
{
if (XEXP (x, 0) != 0
&& refers_to_regno_p (regno, endregno, XEXP (x, 0), NULL_RTX))
&& refers_to_regno_p (regno, endregno, XEXP (x, 0), NULL_PTR))
{
/* If this is the only entry on the list, clear
reg_values[i]. Otherwise, just clear this entry on
@ -8186,7 +8186,7 @@ reload_cse_record_set (set, body)
rtx set;
rtx body;
{
rtx dest, src;
rtx dest, src, x;
int dreg, sreg;
enum machine_mode dest_mode;
@ -8196,6 +8196,23 @@ reload_cse_record_set (set, body)
sreg = true_regnum (src);
dest_mode = GET_MODE (dest);
/* Some machines don't define AUTO_INC_DEC, but they still use push
instructions. We need to catch that case here in order to
invalidate the stack pointer correctly. Note that invalidating
the stack pointer is different from invalidating DEST. */
x = dest;
while (GET_CODE (x) == SUBREG
|| GET_CODE (x) == ZERO_EXTRACT
|| GET_CODE (x) == SIGN_EXTRACT
|| GET_CODE (x) == STRICT_LOW_PART)
x = XEXP (x, 0);
if (push_operand (x, GET_MODE (x)))
{
reload_cse_invalidate_rtx (stack_pointer_rtx, NULL_RTX);
reload_cse_invalidate_rtx (dest, NULL_RTX);
return;
}
/* We can only handle an assignment to a register, or a store of a
register to a memory location. For other cases, we just clobber
the destination. We also have to just clobber if there are side