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jump.c (jmp_uses_reg_or_mem): Deleted unused function.

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* jump.c (jmp_uses_reg_or_mem): Deleted unused function.
        (find_basic_blocks): Use computed_jump_p to determine if a
        particular JUMP_INSN is a computed jump.
        * reg-stack.c (find_blocks): Use computed_jump_p to determine
        if a particular JUMP_INSN is a computed jump.
        * rtlanal.c (jmp_uses_reg_or_mem): New function.
        (computed_jump_p): Likewise.
        * rtl.h (computed_jump_p): Declare.
        * genattrtab.c (pc_rtx): Define and initialize.
        * loop.c (loop_optimize): Always determine if the current
        function has a computed jump.
        (indirect_jump_in_function_p): Use computed_jump_p to determine
        if a particular JUMP_INSN is a computed jump.
General (and haifa) cleanups.

From-SVN: r15615
This commit is contained in:
Jeffrey A Law 1997-09-22 00:49:32 +00:00 committed by Jeff Law
parent 37842442c3
commit 2a1777af22
6 changed files with 133 additions and 55 deletions
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14
gcc/ChangeLog
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@ -1,5 +1,19 @@
Sun Sep 21 17:45:45 1997 Jeffrey A Law (law@cygnus.com)
* jump.c (jmp_uses_reg_or_mem): Deleted unused function.
(find_basic_blocks): Use computed_jump_p to determine if a
particular JUMP_INSN is a computed jump.
* reg-stack.c (find_blocks): Use computed_jump_p to determine
if a particular JUMP_INSN is a computed jump.
* rtlanal.c (jmp_uses_reg_or_mem): New function.
(computed_jump_p): Likewise.
* rtl.h (computed_jump_p): Declare.
* genattrtab.c (pc_rtx): Define and initialize.
* loop.c (loop_optimize): Always determine if the current
function has a computed jump.
(indirect_jump_in_function_p): Use computed_jump_p to determine
if a particular JUMP_INSN is a computed jump.
* loop.c (fix_bct_param): Delete unused function.
(check_bct_param): Likewise.

7
gcc/genattrtab.c
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@ -483,6 +483,8 @@ struct attr_hash *attr_hash_table[RTL_HASH_SIZE];
codes are made. */
#define RTL_HASH(RTL) ((HOST_WIDE_INT) (RTL) & 0777777)
rtx pc_rtx;
/* Add an entry to the hash table for RTL with hash code HASHCODE. */
static void
@ -5573,6 +5575,11 @@ main (argc, argv)
init_rtl ();
/* We don't use this, but it is referenced in rtlanal.c.
Set it up correctly just in case someone tries to use it someday. */
pc_rtx = rtx_alloc (PC);
PUT_MODE (pc_rtx, VOIDmode);
/* Set up true and false rtx's */
true_rtx = rtx_alloc (CONST_INT);
XWINT (true_rtx, 0) = 1;

42
gcc/loop.c
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@ -330,13 +330,14 @@ static void insert_bct ();
/* Auxiliary function that inserts the bct pattern into the loop */
static void instrument_loop_bct ();
/* Indirect_jump_in_function is computed once per function. */
int indirect_jump_in_function = 0;
static int indirect_jump_in_function_p ();
int loop_number ();
#endif /* HAIFA */
/* Indirect_jump_in_function is computed once per function. */
int indirect_jump_in_function = 0;
static int indirect_jump_in_function_p ();
/* Relative gain of eliminating various kinds of operations. */
int add_cost;
@ -507,11 +508,9 @@ loop_optimize (f, dumpfile)
if (flag_unroll_loops && write_symbols != NO_DEBUG)
find_loop_tree_blocks ();
#ifdef HAIFA
/* determine if the function has indirect jump. If it does,
we cannot instrument loops in this function with bct */
/* Determine if the function has indirect jump. On some systems
this prevents low overhead loop instructions from being used. */
indirect_jump_in_function = indirect_jump_in_function_p (f);
#endif /* HAIFA */
/* Now scan the loops, last ones first, since this means inner ones are done
before outer ones. */
@ -7592,8 +7591,12 @@ loop_number (loop_start, loop_end)
return loop_num;
}
#endif /* HAIFA */
/* scan the function and determine whether it has indirect (computed) jump */
/* Scan the function and determine whether it has indirect (computed) jumps.
This is taken mostly from flow.c; similar code exists elsewhere
in the compiler. It may be useful to put this into rtlanal.c. */
static int
indirect_jump_in_function_p (start)
rtx start;
@ -7601,25 +7604,8 @@ indirect_jump_in_function_p (start)
rtx insn;
int is_indirect_jump = 0;
for (insn = start; insn; insn = NEXT_INSN (insn)) {
if (GET_CODE (insn) == JUMP_INSN) {
if (GET_CODE (PATTERN (insn)) == SET) {
rtx insn_work_code = XEXP (PATTERN (insn), 1);
if (GET_CODE (insn_work_code) == LABEL_REF)
continue;
if (GET_CODE (insn_work_code) == IF_THEN_ELSE) {
rtx jump_target = XEXP (insn_work_code, 1);
if (jump_target == pc_rtx
|| (GET_CODE (jump_target) == (enum rtx_code)LABEL_REF))
continue;
}
}
is_indirect_jump = 1;
}
}
return is_indirect_jump;
for (insn = start; insn; insn = NEXT_INSN (insn))
if (computed_jump_p (insn))
return 1;
}
#endif /* HAIFA */
/* END CYGNUS LOCAL haifa */

28
gcc/reg-stack.c
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@ -1351,34 +1351,8 @@ find_blocks (first)
if (GET_CODE (insn) == JUMP_INSN)
{
rtx pat = PATTERN (insn);
int computed_jump = 0;
rtx x;
if (GET_CODE (pat) == PARALLEL)
{
int len = XVECLEN (pat, 0);
int has_use_labelref = 0;
int i;
for (i = len - 1; i >= 0; i--)
if (GET_CODE (XVECEXP (pat, 0, i)) == USE
&& GET_CODE (XEXP (XVECEXP (pat, 0, i), 0)) == LABEL_REF)
has_use_labelref = 1;
if (! has_use_labelref)
for (i = len - 1; i >= 0; i--)
if (GET_CODE (XVECEXP (pat, 0, i)) == SET
&& SET_DEST (XVECEXP (pat, 0, i)) == pc_rtx
&& uses_reg_or_mem (SET_SRC (XVECEXP (pat, 0, i))))
computed_jump = 1;
}
else if (GET_CODE (pat) == SET
&& SET_DEST (pat) == pc_rtx
&& uses_reg_or_mem (SET_SRC (pat)))
computed_jump = 1;
if (computed_jump)
if (computed_jump_p (insn))
{
for (x = label_value_list; x; x = XEXP (x, 1))
record_label_references (insn,

1
gcc/rtl.h
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@ -978,3 +978,4 @@ extern void init_alias_analysis PROTO((void));
extern void end_alias_analysis PROTO((void));
extern void mark_user_reg PROTO((rtx));
extern void mark_reg_pointer PROTO((rtx, int));
extern int computed_jump_p PROTO((rtx));

96
gcc/rtlanal.c
View File

@ -25,6 +25,10 @@ Boston, MA 02111-1307, USA. */
void note_stores ();
int reg_set_p ();
/* Forward declarations */
static int jmp_uses_reg_or_mem PROTO((rtx));
/* Bit flags that specify the machine subtype we are compiling for.
Bits are tested using macros TARGET_... defined in the tm.h file
and set by `-m...' switches. Must be defined in rtlanal.c. */
@ -1847,3 +1851,95 @@ replace_regs (x, reg_map, nregs, replace_dest)
}
return x;
}
/* Return 1 if X, the SRC_SRC of SET of (pc) contain a REG or MEM that is
not in the constant pool and not in the condition of an IF_THEN_ELSE. */
static int
jmp_uses_reg_or_mem (x)
rtx x;
{
enum rtx_code code = GET_CODE (x);
int i, j;
char *fmt;
switch (code)
{
case CONST:
case LABEL_REF:
case PC:
return 0;
case REG:
return 1;
case MEM:
return ! (GET_CODE (XEXP (x, 0)) == SYMBOL_REF
&& CONSTANT_POOL_ADDRESS_P (XEXP (x, 0)));
case IF_THEN_ELSE:
return (jmp_uses_reg_or_mem (XEXP (x, 1))
|| jmp_uses_reg_or_mem (XEXP (x, 2)));
case PLUS: case MINUS: case MULT:
return (jmp_uses_reg_or_mem (XEXP (x, 0))
|| jmp_uses_reg_or_mem (XEXP (x, 1)));
}
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
{
if (fmt[i] == 'e'
&& jmp_uses_reg_or_mem (XEXP (x, i)))
return 1;
if (fmt[i] == 'E')
for (j = 0; j < XVECLEN (x, i); j++)
if (jmp_uses_reg_or_mem (XVECEXP (x, i, j)))
return 1;
}
return 0;
}
/* Return nonzero if INSN is an indirect jump (aka computed jump).
Tablejumps and casesi insns are not considered indirect jumps;
we can recognize them by a (use (lael_ref)). */
int
computed_jump_p (insn)
rtx insn;
{
int i;
if (GET_CODE (insn) == JUMP_INSN)
{
rtx pat = PATTERN (insn);
int computed_jump = 0;
if (GET_CODE (pat) == PARALLEL)
{
int len = XVECLEN (pat, 0);
int has_use_labelref = 0;
for (i = len - 1; i >= 0; i--)
if (GET_CODE (XVECEXP (pat, 0, i)) == USE
&& (GET_CODE (XEXP (XVECEXP (pat, 0, i), 0))
== LABEL_REF))
has_use_labelref = 1;
if (! has_use_labelref)
for (i = len - 1; i >= 0; i--)
if (GET_CODE (XVECEXP (pat, 0, i)) == SET
&& SET_DEST (XVECEXP (pat, 0, i)) == pc_rtx
&& jmp_uses_reg_or_mem (SET_SRC (XVECEXP (pat, 0, 1))))
return 1;
}
else if (GET_CODE (pat) == SET
&& SET_DEST (pat) == pc_rtx
&& jmp_uses_reg_or_mem (SET_SRC (pat)))
return 1;
}
return 0;
}