diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index d6ec6ac..87a2f8d 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -2373,11 +2373,17 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p) && REG_P (i2dest) #endif /* We need I2DEST in the proper mode. If it is a hard register - or the only use of a pseudo, we can change its mode. */ + or the only use of a pseudo, we can change its mode. + Make sure we don't change a hard register to have a mode that + isn't valid for it, or change the number of registers. */ && (GET_MODE (*split) == GET_MODE (i2dest) || GET_MODE (*split) == VOIDmode - || REGNO (i2dest) < FIRST_PSEUDO_REGISTER - || (REG_N_SETS (REGNO (i2dest)) == 1 && ! added_sets_2 + || (REGNO (i2dest) < FIRST_PSEUDO_REGISTER + && HARD_REGNO_MODE_OK (REGNO (i2dest), GET_MODE (*split)) + && (HARD_REGNO_NREGS (REGNO (i2dest), GET_MODE (i2dest)) + == HARD_REGNO_NREGS (REGNO (i2dest), GET_MODE (*split)))) + || (REGNO (i2dest) >= FIRST_PSEUDO_REGISTER + && REG_N_SETS (REGNO (i2dest)) == 1 && ! added_sets_2 && ! REG_USERVAR_P (i2dest))) && (next_real_insn (i2) == i3 || ! use_crosses_set_p (*split, INSN_CUID (i2))) |