diff options
| author | Richard Kenner <kenner@gcc.gnu.org> | 1993-06-23 19:17:47 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1993-06-23 19:17:47 -0400 |
| commit | e15eb3aa705ff04ca1b97da59dfac6b912915c2a (patch) | |
| tree | 215cc0ac839224e77f77635ce77331eb3b67d5dd /gcc | |
| parent | 0f21219f14b95beecc707b9ee2582a1dc646f1e1 (diff) | |
| download | gcc-e15eb3aa705ff04ca1b97da59dfac6b912915c2a.zip gcc-e15eb3aa705ff04ca1b97da59dfac6b912915c2a.tar.gz gcc-e15eb3aa705ff04ca1b97da59dfac6b912915c2a.tar.bz2 | |
(alloc_qty_for_scratch): Can allocate likely-spilled register classes for SCRATCH.
(alloc_qty_for_scratch): Can allocate likely-spilled register classes
for SCRATCH.
(block_alloc): Likewise for regs in small register classes.
From-SVN: r4719
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/local-alloc.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/gcc/local-alloc.c b/gcc/local-alloc.c index a576efa..5d7b0e6 100644 --- a/gcc/local-alloc.c +++ b/gcc/local-alloc.c @@ -1,5 +1,5 @@ /* Allocate registers within a basic block, for GNU compiler. - Copyright (C) 1987, 1988, 1991 Free Software Foundation, Inc. + Copyright (C) 1987, 1988, 1991, 1993 Free Software Foundation, Inc. This file is part of GNU CC. @@ -345,11 +345,7 @@ alloc_qty_for_scratch (scratch, n, insn, insn_code_num, insn_number) break; } - /* If CLASS has only a few registers, don't allocate the SCRATCH here since - it will prevent that register from being used as a spill register. - reload will do the allocation. */ - - if (class == NO_REGS || CLASS_LIKELY_SPILLED_P (class)) + if (class == NO_REGS) return; #else /* REGISTER_CONSTRAINTS */ @@ -400,6 +396,11 @@ local_alloc () See the declarations of these variables, above, for what they mean. */ + /* There can be up to MAX_SCRATCH * N_BASIC_BLOCKS SCRATCHes to allocate. + Instead of allocating this much memory from now until the end of + reload, only allocate space for MAX_QTY SCRATCHes. If there are more + reload will allocate them. */ + scratch_list_length = max_qty; scratch_list = (rtx *) xmalloc (scratch_list_length * sizeof (rtx)); bzero (scratch_list, scratch_list_length * sizeof (rtx)); @@ -1335,13 +1336,7 @@ block_alloc (b) && GET_CODE (XEXP (link, 0)) == REG) wipe_dead_reg (XEXP (link, 0), 1); -#ifndef SMALL_REGISTER_CLASSES - /* Allocate quantities for any SCRATCH operands of this insn. We - don't do this for machines with small register classes because - those machines can use registers explicitly mentioned in the - RTL as spill registers and our usage of hard registers - explicitly for SCRATCH operands will conflict. On those machines, - reload will allocate the SCRATCH. */ + /* Allocate quantities for any SCRATCH operands of this insn. */ if (insn_code_number >= 0) for (i = 0; i < insn_n_operands[insn_code_number]; i++) @@ -1349,7 +1344,6 @@ block_alloc (b) && scratch_index < scratch_list_length - 1) alloc_qty_for_scratch (recog_operand[i], i, insn, insn_code_number, insn_number); -#endif /* If this is an insn that has a REG_RETVAL note pointing at a CLOBBER insn, we have reached the end of a REG_NO_CONFLICT |