diff options
Diffstat (limited to 'gcc/targhooks.c')
| -rw-r--r-- | gcc/targhooks.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/targhooks.c b/gcc/targhooks.c index 1d5a7fe..afeba1f 100644 --- a/gcc/targhooks.c +++ b/gcc/targhooks.c @@ -514,10 +514,15 @@ default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED, } scratch_constraint = insn_data[(int) icode].operand[2].constraint; - /* The scratch register's constraint must start with "=&". */ + /* The scratch register's constraint must start with "=&", + except for an input reload, where only "=" is necessary, + and where it might be beneficial to re-use registers from + the input. */ gcc_assert (scratch_constraint[0] == '=' - && scratch_constraint[1] == '&'); - scratch_constraint += 2; + && (in_p || scratch_constraint[1] == '&')); + scratch_constraint++; + if (*scratch_constraint == '&') + scratch_constraint++; scratch_letter = *scratch_constraint; scratch_class = (scratch_letter == 'r' ? GENERAL_REGS |