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regclass.c (reg_scan_mark_refs): Return immediately if passed a NULL_RTX as an argument.

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        * regclass.c (reg_scan_mark_refs): Return immediately if passed a
        NULL_RTX as an argument.

From-SVN: r22741
This commit is contained in:
Jeff Law 1998-10-01 19:34:34 -06:00
parent 8ac538460a
commit fa23c63611
1 changed files with 9 additions and 1 deletions
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10
gcc/regclass.c
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@ -1991,10 +1991,18 @@ reg_scan_mark_refs (x, insn, note_flag, min_regno)
int note_flag;
int min_regno;
{
register enum rtx_code code = GET_CODE (x);
register enum rtx_code code;
register rtx dest;
register rtx note;
/* This can happen when scanning insns referenced by certain notes.
It is unclear if we should be scanning such insns; until someone can
say for sure this seems like the safest fix. */
if (x == NULL_RTX)
return;
code = GET_CODE (x);
switch (code)
{
case CONST_INT: