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(subst): Move up test for too many restarts.

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If we restart, clear OP0_MODE since we don't know it.

From-SVN: r1926
This commit is contained in:
Richard Kenner 1992-08-21 07:52:57 -04:00
parent 4d6697ca22
commit eeb43d32db
1 changed files with 12 additions and 5 deletions
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17
gcc/combine.c
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@ -2580,6 +2580,18 @@ subst (x, from, to, in_dest, unique_copy)
restart:
/* If we have restarted more than 4 times, we are probably looping, so
give up. */
if (++n_restarts > 4)
return x;
/* If we are restarting at all, it means that we no longer know the
original mode of operand 0 (since we have probably changed the
form of X). */
if (n_restarts > 1)
op0_mode = VOIDmode;
code = GET_CODE (x);
/* If this is a commutative operation, put a constant last and a complex
@ -2663,11 +2675,6 @@ subst (x, from, to, in_dest, unique_copy)
if (temp)
x = temp, code = GET_CODE (temp);
/* If we have restarted more than 4 times, we are probably looping, so
give up. */
if (++n_restarts > 4)
return x;
/* First see if we can apply the inverse distributive law. */
if (code == PLUS || code == MINUS || code == IOR || code == XOR)
{