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(can_combine_p... 

(can_combine_p, combinable_i3pat, try_combine): Allow combination
involving hard regs if the hard reg is a user variable.

From-SVN: r7131
This commit is contained in:
Richard Kenner 1994-04-21 18:27:25 -04:00
parent defb5dab7d
commit c448a43e24
1 changed files with 16 additions and 14 deletions
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30
gcc/combine.c
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@ -927,14 +927,16 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc)
if (GET_CODE (src) == REG
&& ((REGNO (dest) < FIRST_PSEUDO_REGISTER
&& ! HARD_REGNO_MODE_OK (REGNO (dest), GET_MODE (dest)))
#ifdef SMALL_REGISTER_CLASSES
/* Don't extend the life of a hard register. */
|| REGNO (src) < FIRST_PSEUDO_REGISTER
#else
/* Don't extend the life of a hard register unless it is
user variable (if we have few registers) or it can't
fit into the desired register (meaning something special
is going on). */
|| (REGNO (src) < FIRST_PSEUDO_REGISTER
&& ! HARD_REGNO_MODE_OK (REGNO (src), GET_MODE (src)))
&& (! HARD_REGNO_MODE_OK (REGNO (src), GET_MODE (src))
#ifdef SMALL_REGISTER_CLASSES
|| ! REG_USERVAR_P (src)
#endif
))
))))
return 0;
}
else if (GET_CODE (dest) != CC0)
@ -1038,7 +1040,8 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc)
of a SET must prevent combination from occurring.
On machines where SMALL_REGISTER_CLASSES is defined, we don't combine
if the destination of a SET is a hard register.
if the destination of a SET is a hard register that isn't a user
variable.
Before doing the above check, we first try to expand a field assignment
into a set of logical operations.
@ -1108,14 +1111,12 @@ combinable_i3pat (i3, loc, i2dest, i1dest, i1_not_in_src, pi3dest_killed)
CALL operation. */
|| (GET_CODE (inner_dest) == REG
&& REGNO (inner_dest) < FIRST_PSEUDO_REGISTER
&& (! HARD_REGNO_MODE_OK (REGNO (inner_dest),
GET_MODE (inner_dest))
#ifdef SMALL_REGISTER_CLASSES
&& GET_CODE (src) != CALL
#else
&& ! HARD_REGNO_MODE_OK (REGNO (inner_dest),
GET_MODE (inner_dest))
|| (GET_CODE (src) != CALL && ! REG_USERVAR_P (inner_dest))
#endif
)
))
|| (i1_not_in_src && reg_overlap_mentioned_p (i1dest, src)))
return 0;
@ -1254,7 +1255,8 @@ try_combine (i3, i2, i1)
&& REGNO (SET_SRC (PATTERN (i3))) >= FIRST_PSEUDO_REGISTER
#ifdef SMALL_REGISTER_CLASSES
&& (GET_CODE (SET_DEST (PATTERN (i3))) != REG
|| REGNO (SET_DEST (PATTERN (i3))) >= FIRST_PSEUDO_REGISTER)
|| REGNO (SET_DEST (PATTERN (i3))) >= FIRST_PSEUDO_REGISTER
|| REG_USERVAR_P (SET_DEST (PATTERN (i3))))
#endif
&& find_reg_note (i3, REG_DEAD, SET_SRC (PATTERN (i3)))
&& GET_CODE (PATTERN (i2)) == PARALLEL