diff options
author | Richard Henderson <rth@gcc.gnu.org> | 2016-01-27 14:08:02 -0800 |
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committer | Richard Henderson <rth@gcc.gnu.org> | 2016-01-27 14:08:02 -0800 |
commit | f75ebe779f546c9e9c8a66c56c04ebf5fe1b7dda (patch) | |
tree | b73d554ab53c509b4cfa2110e4372821e41583a1 /gcc/lra-remat.c | |
parent | 49847d759f449f0b299fae28932e996037338f88 (diff) |
re PR rtl-optimization/69447 (wrong code with -O2 -fno-schedule-insns and mixed 8/16/32/64bit arithmetics @ armv7a)
PR rtl-opt/69447
* lra-remat.c (subreg_regs): New.
(dump_candidates_and_remat_bb_data): Dump it.
(operand_to_remat): Reject if operand in subreg_regs.
(set_bb_regs): Collect subreg_regs.
(lra_remat): Init and free subreg_regs. Compute
calculate_local_reg_remat_bb_data before create_cands.
From-SVN: r232905
Diffstat (limited to 'gcc/lra-remat.c')
-rw-r--r-- | gcc/lra-remat.c | 77 |
1 files changed, 44 insertions, 33 deletions
diff --git a/gcc/lra-remat.c b/gcc/lra-remat.c index 6f490b991ee..4d8099fcd8e 100644 --- a/gcc/lra-remat.c +++ b/gcc/lra-remat.c @@ -77,6 +77,9 @@ static int call_used_regs_arr[FIRST_PSEUDO_REGISTER]; /* Bitmap used for different calculations. */ static bitmap_head temp_bitmap; +/* Registers accessed via subreg_p. */ +static bitmap_head subreg_regs; + typedef struct cand *cand_t; typedef const struct cand *const_cand_t; @@ -383,30 +386,30 @@ operand_to_remat (rtx_insn *insn) return -1; /* First find a pseudo which can be rematerialized. */ for (reg = id->regs; reg != NULL; reg = reg->next) - /* True FRAME_POINTER_NEEDED might be because we can not follow - changing sp offsets, e.g. alloca is used. If the insn contains - stack pointer in such case, we can not rematerialize it as we - can not know sp offset at a rematerialization place. */ - if (reg->regno == STACK_POINTER_REGNUM && frame_pointer_needed) - return -1; - else if (reg->type == OP_OUT && ! reg->subreg_p - && find_regno_note (insn, REG_UNUSED, reg->regno) == NULL) - { - /* We permits only one spilled reg. */ - if (found_reg != NULL) - return -1; - found_reg = reg; - } - /* IRA calculates conflicts separately for subregs of two words - pseudo. Even if the pseudo lives, e.g. one its subreg can be - used lately, another subreg hard register can be already used - for something else. In such case, it is not safe to - rematerialize the insn. */ - else if (reg->type == OP_IN && reg->subreg_p - && reg->regno >= FIRST_PSEUDO_REGISTER - && (GET_MODE_SIZE (PSEUDO_REGNO_MODE (reg->regno)) - == 2 * UNITS_PER_WORD)) - return -1; + { + /* True FRAME_POINTER_NEEDED might be because we can not follow + changing sp offsets, e.g. alloca is used. If the insn contains + stack pointer in such case, we can not rematerialize it as we + can not know sp offset at a rematerialization place. */ + if (reg->regno == STACK_POINTER_REGNUM && frame_pointer_needed) + return -1; + else if (reg->type == OP_OUT && ! reg->subreg_p + && find_regno_note (insn, REG_UNUSED, reg->regno) == NULL) + { + /* We permits only one spilled reg. */ + if (found_reg != NULL) + return -1; + found_reg = reg; + } + /* IRA calculates conflicts separately for subregs of two words + pseudo. Even if the pseudo lives, e.g. one its subreg can be + used lately, another subreg hard register can be already used + for something else. In such case, it is not safe to + rematerialize the insn. */ + if (reg->regno >= FIRST_PSEUDO_REGISTER + && bitmap_bit_p (&subreg_regs, reg->regno)) + return -1; + } if (found_reg == NULL) return -1; if (found_reg->regno < FIRST_PSEUDO_REGISTER) @@ -631,6 +634,9 @@ dump_candidates_and_remat_bb_data (void) lra_dump_bitmap_with_title ("avout cands in BB", &get_remat_bb_data (bb)->avout_cands, bb->index); } + fprintf (lra_dump_file, "subreg regs:"); + dump_regset (&subreg_regs, lra_dump_file); + putc ('\n', lra_dump_file); } /* Free all BB data. */ @@ -655,21 +661,24 @@ finish_remat_bb_data (void) -/* Update changed_regs and dead_regs of BB from INSN. */ +/* Update changed_regs, dead_regs, subreg_regs of BB from INSN. */ static void set_bb_regs (basic_block bb, rtx_insn *insn) { lra_insn_recog_data_t id = lra_get_insn_recog_data (insn); + remat_bb_data_t bb_info = get_remat_bb_data (bb); struct lra_insn_reg *reg; for (reg = id->regs; reg != NULL; reg = reg->next) - if (reg->type != OP_IN) - bitmap_set_bit (&get_remat_bb_data (bb)->changed_regs, reg->regno); - else - { - if (find_regno_note (insn, REG_DEAD, (unsigned) reg->regno) != NULL) - bitmap_set_bit (&get_remat_bb_data (bb)->dead_regs, reg->regno); - } + { + unsigned regno = reg->regno; + if (reg->type != OP_IN) + bitmap_set_bit (&bb_info->changed_regs, regno); + else if (find_regno_note (insn, REG_DEAD, regno) != NULL) + bitmap_set_bit (&bb_info->dead_regs, regno); + if (regno >= FIRST_PSEUDO_REGISTER && reg->subreg_p) + bitmap_set_bit (&subreg_regs, regno); + } if (CALL_P (insn)) for (int i = 0; i < call_used_regs_arr_len; i++) bitmap_set_bit (&get_remat_bb_data (bb)->dead_regs, @@ -1284,10 +1293,11 @@ lra_remat (void) if (call_used_regs[i]) call_used_regs_arr[call_used_regs_arr_len++] = i; initiate_cand_table (); - create_cands (); create_remat_bb_data (); bitmap_initialize (&temp_bitmap, ®_obstack); + bitmap_initialize (&subreg_regs, ®_obstack); calculate_local_reg_remat_bb_data (); + create_cands (); calculate_livein_cands (); calculate_gen_cands (); bitmap_initialize (&all_blocks, ®_obstack); @@ -1298,6 +1308,7 @@ lra_remat (void) result = do_remat (); all_cands.release (); bitmap_clear (&temp_bitmap); + bitmap_clear (&subreg_regs); finish_remat_bb_data (); finish_cand_table (); bitmap_clear (&all_blocks); |