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(FIXED_REGNO_P): Treate global regs as fixed.

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(CHEAP_REGNO): Renamed from CHEAP_REG.
(CHEAP_REG): New macro; user var in hard reg is cheap.
(COST): Pass RTL to CHEAP_REG, not regno.
(rtx_cost, case REG): Likewise.

From-SVN: r6836
This commit is contained in:
Richard Kenner 1994-03-21 07:36:48 -05:00
parent a61e5d28e9
commit 6ab832bc31
1 changed files with 12 additions and 5 deletions
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17
gcc/cse.c
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@ -445,12 +445,12 @@ struct table_elt
#ifdef OVERLAPPING_REGNO_P
#define FIXED_REGNO_P(N) \
(((N) == FRAME_POINTER_REGNUM || (N) == HARD_FRAME_POINTER_REGNUM \
|| fixed_regs[N]) \
|| fixed_regs[N] || global_regs[N]) \
&& ! OVERLAPPING_REGNO_P ((N)))
#else
#define FIXED_REGNO_P(N) \
((N) == FRAME_POINTER_REGNUM || (N) == HARD_FRAME_POINTER_REGNUM \
|| fixed_regs[N])
|| fixed_regs[N] || global_regs[N])
#endif
/* Compute cost of X, as stored in the `cost' field of a table_elt. Fixed
@ -458,16 +458,23 @@ struct table_elt
of 0. Next come pseudos with a cost of one and other hard registers with
a cost of 2. Aside from these special cases, call `rtx_cost'. */
#define CHEAP_REG(N) \
#define CHEAP_REGNO(N) \
((N) == FRAME_POINTER_REGNUM || (N) == HARD_FRAME_POINTER_REGNUM \
|| (N) == STACK_POINTER_REGNUM || (N) == ARG_POINTER_REGNUM \
|| ((N) >= FIRST_VIRTUAL_REGISTER && (N) <= LAST_VIRTUAL_REGISTER) \
|| ((N) < FIRST_PSEUDO_REGISTER \
&& FIXED_REGNO_P (N) && REGNO_REG_CLASS (N) != NO_REGS))
/* A register is cheap if it is a user variable assigned to the register
or if its register number always corresponds to a cheap register. */
#define CHEAP_REG(N) \
((REG_USERVAR_P (N) && REGNO (N) < FIRST_PSEUDO_REGISTER) \
|| CHEAP_REGNO (REGNO (N)))
#define COST(X) \
(GET_CODE (X) == REG \
? (CHEAP_REG (REGNO (X)) ? 0 \
? (CHEAP_REG (X) ? 0 \
: REGNO (X) >= FIRST_PSEUDO_REGISTER ? 1 \
: 2) \
: rtx_cost (X, SET) * 2)
@ -717,7 +724,7 @@ rtx_cost (x, outer_code)
switch (code)
{
case REG:
return ! CHEAP_REG (REGNO (x));
return ! CHEAP_REG (x);
case SUBREG:
/* If we can't tie these modes, make this expensive. The larger