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reorg.c (dbr_schedule): At end of this pass... 

* reorg.c (dbr_schedule): At end of this pass, add REG_BR_PRED
        note holding get_jump_flags() calculation to all JUMP_INSNs.
        * rtl.h (enum reg_note): New note types REG_BR_PRED and REG_SAVE_AREA.
        * rtl.c (reg_note_name): Add new note types.

From-SVN: r15670
This commit is contained in:
David S. Miller 1997-09-23 07:14:07 +00:00 committed by Jeff Law
parent 5cd278f399
commit c107334d5c
4 changed files with 34 additions and 3 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
Tue Sep 23 01:15:50 1997 David S. Miller <davem@tanya.rutgers.edu>
* reorg.c (dbr_schedule): At end of this pass, add REG_BR_PRED
note holding get_jump_flags() calculation to all JUMP_INSNs.
* rtl.h (enum reg_note): New note types REG_BR_PRED and REG_SAVE_AREA.
* rtl.c (reg_note_name): Add new note types.
Tue Sep 23 00:59:54 1997 Jeffrey A Law (law@cygnus.com)
* rtlanal.c (computed_jump_p): Fix typo in last change.

17
gcc/reorg.c
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@ -4617,5 +4617,22 @@ dbr_schedule (first, file)
}
}
}
/* For all JUMP insns, fill in branch prediction notes, so that during
assembler output a target can set branch prediction bits in the code.
We have to do this now, as up until this point the destinations of
JUMPS can be moved around and changed, but past right here that cannot
happen. */
for (insn = first; insn; insn = NEXT_INSN (insn))
{
int pred_flags;
if (GET_CODE (insn) != JUMP_INSN)
continue;
pred_flags = get_jump_flags (insn, JUMP_LABEL (insn));
REG_NOTES (insn) = gen_rtx (EXPR_LIST, REG_BR_PRED,
GEN_INT (pred_flags), REG_NOTES (insn));
}
}
#endif /* DELAY_SLOTS */

3
gcc/rtl.c
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@ -181,7 +181,8 @@ char *reg_note_name[] = { "", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_WAS_0",
"REG_NONNEG", "REG_NO_CONFLICT", "REG_UNUSED",
"REG_CC_SETTER", "REG_CC_USER", "REG_LABEL",
"REG_DEP_ANTI", "REG_DEP_OUTPUT", "REG_BR_PROB",
"REG_EXEC_COUNT", "REG_NOALIAS" };
"REG_EXEC_COUNT", "REG_NOALIAS", "REG_SAVE_AREA",
"REG_BR_PRED" };
/* Allocate an rtx vector of N elements.
Store the length, and initialize all elements to zero. */

10
gcc/rtl.h
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@ -307,7 +307,12 @@ typedef struct rtvec_def{
probability that this call won't return.
REG_EXEC_COUNT is attached to the first insn of each basic block, and
the first insn after each CALL_INSN. It indicates how many times this
block was executed. */
block was executed.
REG_SAVE_AREA is used to optimize rtl generated by dynamic stack
allocations for targets where SETJMP_VIA_SAVE_AREA is true.
REG_BR_PRED is attached to JUMP_INSNs only, it holds the branch prediction
flags computed by get_jump_flags() after dbr scheduling is complete. */
#define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
@ -317,7 +322,8 @@ enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15, REG_BR_PROB = 16,
REG_EXEC_COUNT = 17, REG_NOALIAS = 18 };
REG_EXEC_COUNT = 17, REG_NOALIAS = 18, REG_SAVE_AREA = 19,
REG_BR_PRED = 20 };
/* The base value for branch probability notes. */
#define REG_BR_PROB_BASE 10000