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(qty_changes_size): New variable.

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(alloc_qty{,_for_scratch}, update_qty_class): Set it.
(local_alloc): Allocate it.
(find_free_reg): If CLASS_CANNOT_CHANGE_SIZE, avoid its registers if
qty_changes_size.

From-SVN: r7865
This commit is contained in:
Richard Kenner 1994-08-07 08:51:35 -04:00
parent 80f8f04ad1
commit 0f64b8f696
1 changed files with 17 additions and 0 deletions
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17
gcc/local-alloc.c
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@ -165,6 +165,11 @@ static enum reg_class *qty_alternate_class;
static rtx *qty_scratch_rtx;
/* Element Q is nonzero if this quantity has been used in a SUBREG
that changes its size. */
static char *qty_changes_size;
/* Element Q is the register number of one pseudo register whose
reg_qty value is Q, or -1 is this quantity is for a SCRATCH. This
register should be the head of the chain maintained in reg_next_in_qty. */
@ -289,6 +294,7 @@ alloc_qty (regno, mode, size, birth)
qty_min_class[qty] = reg_preferred_class (regno);
qty_alternate_class[qty] = reg_alternate_class (regno);
qty_n_refs[qty] = reg_n_refs[regno];
qty_changes_size[qty] = reg_changes_size[regno];
}
/* Similar to `alloc_qty', but allocates a quantity for a SCRATCH rtx
@ -378,6 +384,7 @@ alloc_qty_for_scratch (scratch, n, insn, insn_code_num, insn_number)
qty_min_class[qty] = class;
qty_alternate_class[qty] = NO_REGS;
qty_n_refs[qty] = 1;
qty_changes_size[qty] = 0;
}
/* Main entry point of this file. */
@ -439,6 +446,7 @@ local_alloc ()
qty_alternate_class
= (enum reg_class *) alloca (max_qty * sizeof (enum reg_class));
qty_n_refs = (int *) alloca (max_qty * sizeof (int));
qty_changes_size = (char *) alloca (max_qty * sizeof (char));
reg_qty = (int *) alloca (max_regno * sizeof (int));
reg_offset = (char *) alloca (max_regno * sizeof (char));
@ -1925,6 +1933,9 @@ update_qty_class (qty, reg)
rclass = reg_alternate_class (reg);
if (reg_class_subset_p (rclass, qty_alternate_class[qty]))
qty_alternate_class[qty] = rclass;
if (reg_changes_size[reg])
qty_changes_size[qty] = 1;
}
/* Handle something which alters the value of an rtx REG.
@ -2108,6 +2119,12 @@ find_free_reg (class, mode, qty, accept_call_clobbered, just_try_suggested,
SET_HARD_REG_BIT (used, FRAME_POINTER_REGNUM);
#endif
#ifdef CLASS_CANNOT_CHANGE_SIZE
if (qty_changes_size[qty])
IOR_HARD_REG_SET (first_used,
reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE]);
#endif
/* Normally, the registers that can be used for the first register in
a multi-register quantity are the same as those that can be used for
subsequent registers. However, if just trying suggested registers,