/* If-conversion header file.
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Copyright (C) 2014-2017 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_IFCVT_H
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#define GCC_IFCVT_H
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/* Structure to group all of the information to process IF-THEN and
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IF-THEN-ELSE blocks for the conditional execution support. */
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struct ce_if_block
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{
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basic_block test_bb; /* First test block. */
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basic_block then_bb; /* THEN block. */
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basic_block else_bb; /* ELSE block or NULL. */
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basic_block join_bb; /* Join THEN/ELSE blocks. */
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basic_block last_test_bb; /* Last bb to hold && or || tests. */
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int num_multiple_test_blocks; /* # of && and || basic blocks. */
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int num_and_and_blocks; /* # of && blocks. */
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int num_or_or_blocks; /* # of || blocks. */
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int num_multiple_test_insns; /* # of insns in && and || blocks. */
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int and_and_p; /* Complex test is &&. */
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int num_then_insns; /* # of insns in THEN block. */
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int num_else_insns; /* # of insns in ELSE block. */
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int pass; /* Pass number. */
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};
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/* Used by noce_process_if_block to communicate with its subroutines.
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The subroutines know that A and B may be evaluated freely. They
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know that X is a register. They should insert new instructions
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before cond_earliest. */
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struct noce_if_info
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{
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/* The basic blocks that make up the IF-THEN-{ELSE-,}JOIN block. */
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basic_block test_bb, then_bb, else_bb, join_bb;
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/* The jump that ends TEST_BB. */
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rtx_insn *jump;
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/* The jump condition. */
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rtx cond;
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/* Reversed jump condition. */
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rtx rev_cond;
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/* New insns should be inserted before this one. */
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rtx_insn *cond_earliest;
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/* Insns in the THEN and ELSE block. There is always just this
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one insns in those blocks. The insns are single_set insns.
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If there was no ELSE block, INSN_B is the last insn before
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COND_EARLIEST, or NULL_RTX. In the former case, the insn
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operands are still valid, as if INSN_B was moved down below
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the jump. */
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rtx_insn *insn_a, *insn_b;
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/* The SET_SRC of INSN_A and INSN_B. */
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rtx a, b;
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/* The SET_DEST of INSN_A. */
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rtx x;
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/* The original set destination that the THEN and ELSE basic blocks finally
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write their result to. */
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rtx orig_x;
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/* True if this if block is not canonical. In the canonical form of
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if blocks, the THEN_BB is the block reached via the fallthru edge
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from TEST_BB. For the noce transformations, we allow the symmetric
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form as well. */
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bool then_else_reversed;
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/* True if the contents of then_bb and else_bb are a
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simple single set instruction. */
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bool then_simple;
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bool else_simple;
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/* True if we're optimisizing the control block for speed, false if
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we're optimizing for size. */
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bool speed_p;
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/* An estimate of the original costs. When optimizing for size, this is the
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combined cost of COND, JUMP and the costs for THEN_BB and ELSE_BB.
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When optimizing for speed, we use the costs of COND plus the minimum of
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the costs for THEN_BB and ELSE_BB, as computed in the next field. */
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unsigned int original_cost;
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/* Maximum permissible cost for the unconditional sequence we should
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generate to replace this branch. */
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unsigned int max_seq_cost;
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/* The name of the noce transform that succeeded in if-converting
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this structure. Used for debugging. */
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const char *transform_name;
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};
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#endif /* GCC_IFCVT_H */
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