diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index c9d6a52..8a14d80 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -3400,6 +3400,18 @@ subst (x, from, to, in_dest, unique_copy) ) return gen_rtx_CLOBBER (VOIDmode, const0_rtx); +#ifdef CLASS_CANNOT_CHANGE_SIZE + if (code == SUBREG + && GET_CODE (to) == REG + && REGNO (to) < FIRST_PSEUDO_REGISTER + && (TEST_HARD_REG_BIT + (reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE], + REGNO (to))) + && (GET_MODE_BITSIZE (GET_MODE (to)) + != GET_MODE_BITSIZE (GET_MODE (x)))) + return gen_rtx_CLOBBER (VOIDmode, const0_rtx); +#endif + new = (unique_copy && n_occurrences ? copy_rtx (to) : to); n_occurrences++; } |