/* Form lists of pseudo register references for autoinc optimization
for GNU compiler. This is part of flow optimization.
- Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007
+ Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008
Free Software Foundation, Inc.
Originally contributed by Michael P. Hayes
(m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
DF_REF_MUST_CLOBBER = 1 << 7,
- /* This flag is set if this ref is inside a pre/post modify. */
- DF_REF_PRE_POST_MODIFY = 1 << 8,
+ /* If the ref has one of the following two flags set, then the
+ struct df_ref can be cast to struct df_ref_extract to access
+ the width and offset fields. */
+
+ /* This flag is set if the ref contains a SIGN_EXTRACT. */
+ DF_REF_SIGN_EXTRACT = 1 << 8,
- /* This flag is set if the ref contains a ZERO_EXTRACT or SIGN_EXTRACT. */
- DF_REF_EXTRACT = 1 << 9,
+ /* This flag is set if the ref contains a ZERO_EXTRACT. */
+ DF_REF_ZERO_EXTRACT = 1 << 9,
- /* This flag is set if the ref contains a STRICT_LOWER_PART. */
- DF_REF_STRICT_LOWER_PART = 1 << 10,
+ /* This flag is set if the ref contains a STRICT_LOW_PART. */
+ DF_REF_STRICT_LOW_PART = 1 << 10,
/* This flag is set if the ref contains a SUBREG. */
DF_REF_SUBREG = 1 << 11,
DF_REF_CALL_STACK_USAGE = 1 << 13,
/* This flag is used for verification of existing refs. */
- DF_REF_REG_MARKER = 1 << 14
+ DF_REF_REG_MARKER = 1 << 14,
+
+ /* This flag is set if this ref is inside a pre/post modify. */
+ DF_REF_PRE_POST_MODIFY = 1 << 15
+
};
/* The possible ordering of refs within the df_ref_info. */
struct df_ref *prev_reg; /* Prev ref with same regno and type. */
};
+/* A df_ref_extract is just a df_ref with a width and offset field at
+ the end of it. It is used to hold this information if the ref was
+ wrapped by a SIGN_EXTRACT or a ZERO_EXTRACT and to pass this info
+ to passes that wish to process partial regs precisely. */
+struct df_ref_extract
+{
+ struct df_ref ref;
+ int width;
+ int offset;
+};
+
/* These links are used for two purposes:
1) def-use or use-def chains.
2) Multiword hard registers that underly a single hardware register. */
{
/* Scanning flags. */
/* Flag to control the running of dce as a side effect of building LR. */
- DF_LR_RUN_DCE = 1, /* Run DCE. */
- DF_NO_HARD_REGS = 2, /* Skip hard registers in RD and CHAIN Building. */
- DF_EQ_NOTES = 4, /* Build chains with uses present in EQUIV/EQUAL notes. */
- DF_NO_REGS_EVER_LIVE = 8, /* Do not compute the regs_ever_live. */
+ DF_LR_RUN_DCE = 1 << 0, /* Run DCE. */
+ DF_NO_HARD_REGS = 1 << 1, /* Skip hard registers in RD and CHAIN Building. */
+
+ DF_EQ_NOTES = 1 << 2, /* Build chains with uses present in EQUIV/EQUAL notes. */
+ DF_NO_REGS_EVER_LIVE = 1 << 3, /* Do not compute the regs_ever_live. */
/* Cause df_insn_rescan df_notes_rescan and df_insn_delete, to
return immediately. This is used by passes that know how to update
the scanning them selves. */
- DF_NO_INSN_RESCAN = 16,
+ DF_NO_INSN_RESCAN = 1 << 4,
/* Cause df_insn_rescan df_notes_rescan and df_insn_delete, to
return after marking the insn for later processing. This allows all
rescans to be batched. */
- DF_DEFER_INSN_RESCAN = 32,
+ DF_DEFER_INSN_RESCAN = 1 << 5,
- DF_VERIFY_SCHEDULED = 64
+ DF_VERIFY_SCHEDULED = 1 << 6
};
/* Two of these structures are inline in df, one for the uses and one
#define DF_REF_IS_REG_MARKED(REF) (DF_REF_FLAGS_IS_SET ((REF),DF_REF_REG_MARKER))
#define DF_REF_NEXT_REG(REF) ((REF)->next_reg)
#define DF_REF_PREV_REG(REF) ((REF)->prev_reg)
-
+/* The following two macros may only be applied if one of
+ DF_REF_SIGN_EXTRACT | DF_REF_ZERO_EXTRACT is true. */
+#define DF_REF_WIDTH(REF) (((struct df_ref_extract *)(REF))->width)
+#define DF_REF_OFFSET(REF) (((struct df_ref_extract *)(REF))->offset)
/* Macros to determine the reference type. */
#define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
/* Reaching definitions. All bitmaps are indexed by the id field of
- the ref except sparse_kill (see above). */
+ the ref except sparse_kill which is indexed by regno. */
struct df_rd_bb_info
{
- /* Local sets to describe the basic blocks. See the note in the RU
- datastructures for kill and sparse_kill. */
+ /* Local sets to describe the basic blocks. */
bitmap kill;
bitmap sparse_kill;
bitmap gen; /* The set of defs generated in this block. */
extern void df_grow_insn_info (void);
extern void df_scan_blocks (void);
extern struct df_ref *df_ref_create (rtx, rtx *, rtx,basic_block,
- enum df_ref_type, enum df_ref_flags);
+ enum df_ref_type, enum df_ref_flags,
+ int, int);
extern void df_ref_remove (struct df_ref *);
extern struct df_insn_info * df_insn_create_insn_record (rtx);
extern void df_insn_delete (basic_block, unsigned int);
extern void df_insn_rescan_all (void);
extern void df_process_deferred_rescans (void);
extern void df_recompute_luids (basic_block);
-extern void df_insn_change_bb (rtx);
+extern void df_insn_change_bb (rtx, basic_block);
extern void df_maybe_reorganize_use_refs (enum df_ref_order);
extern void df_maybe_reorganize_def_refs (enum df_ref_order);
extern void df_ref_change_reg_with_loc (int, int, rtx);
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