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cfgloop.h (struct loop): Update comment.

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* cfgloop.h (struct loop): Update comment.
	* cse.c (cse_main): Remove obsolete comment.

	* expr.h (gen_cond_trap): Move prototype under functions provided
	by optabs.c.
	(canonicalize_condition, get_condition): Move to...
	* rtl.h (canonicalize_condition, get_condition): ...here.
	(branch_target_load_optimize): Add comment that this function is
	in bt-load.c.
	* loop.c (canonicalize_condition, get_condition): Move to...
	* rtlanal.c (canonicalize_condition, get_condition): ...here.
	* sched-deps.c (get_condition): Rename to sched_get_condition.
	(add_dependence): Update this caller.

From-SVN: r89995
This commit is contained in:
Steven Bosscher 2004-11-02 17:59:46 +00:00 • committed by Steven Bosscher
parent 65e9700cc0
commit 75473b0257
8 changed files with 350 additions and 336 deletions
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16
gcc/ChangeLog
View file

@ -1,3 +1,19 @@
2004-11-02 Steven Bosscher <stevenb@suse.de>
* cfgloop.h (struct loop): Update comment.
* cse.c (cse_main): Remove obsolete comment.
* expr.h (gen_cond_trap): Move prototype under functions provided
by optabs.c.
(canonicalize_condition, get_condition): Move to...
* rtl.h (canonicalize_condition, get_condition): ...here.
(branch_target_load_optimize): Add comment that this function is
in bt-load.c.
* loop.c (canonicalize_condition, get_condition): Move to...
* rtlanal.c (canonicalize_condition, get_condition): ...here.
* sched-deps.c (get_condition): Rename to sched_get_condition.
(add_dependence): Update this caller.
2004-11-02 Andrew Pinski <pinskia@physics.uc.edu>
PR tree-opt/16808

2
gcc/cfgloop.h
View file

@ -144,7 +144,7 @@ struct loop
void *aux;
/* The following are currently used by loop.c but they are likely to
disappear as loop.c is converted to use the CFG. */
disappear when loop.c is replaced and removed. */
/* The NOTE_INSN_LOOP_BEG. */
rtx start;

6
gcc/cse.c
View file

@ -6775,11 +6775,7 @@ cse_main (rtx f, int nregs, FILE *file)
/* Process a single basic block. FROM and TO and the limits of the basic
block. NEXT_BRANCH points to the branch path when following jumps or
a null path when not following jumps.
AROUND_LOOP is nonzero if we are to try to cse around to the start of a
loop. This is true when we are being called for the last time on a
block and this CSE pass is before loop.c. */
a null path when not following jumps. */
static rtx
cse_basic_block (rtx from, rtx to, struct branch_path *next_branch)

16
gcc/expr.h
View file

@ -298,6 +298,9 @@ extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
/* Generate code to indirectly jump to a location given in the rtx LOC. */
extern void emit_indirect_jump (rtx);
/* Generate a conditional trap instruction. */
extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
#include "insn-config.h"
#ifdef HAVE_conditional_move
@ -329,19 +332,6 @@ extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
/* Like emit_store_flag, but always succeeds. */
extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
enum machine_mode, int, int);
/* Functions from loop.c: */
/* Given an insn and condition, return a canonical description of
the test being made. */
extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int, int);
/* Given a JUMP_INSN, return a canonical description of the test
being made. */
extern rtx get_condition (rtx, rtx *, int, int);
/* Generate a conditional trap instruction. */
extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
/* Functions from builtins.c: */
extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);

315
gcc/loop.c
View file

@ -10438,319 +10438,8 @@ update_reg_last_use (rtx x, rtx insn)
}
}
/* Given an insn INSN and condition COND, return the condition in a
canonical form to simplify testing by callers. Specifically:
(1) The code will always be a comparison operation (EQ, NE, GT, etc.).
(2) Both operands will be machine operands; (cc0) will have been replaced.
(3) If an operand is a constant, it will be the second operand.
(4) (LE x const) will be replaced with (LT x <const+1>) and similarly
for GE, GEU, and LEU.
If the condition cannot be understood, or is an inequality floating-point
comparison which needs to be reversed, 0 will be returned.
If REVERSE is nonzero, then reverse the condition prior to canonizing it.
If EARLIEST is nonzero, it is a pointer to a place where the earliest
insn used in locating the condition was found. If a replacement test
of the condition is desired, it should be placed in front of that
insn and we will be sure that the inputs are still valid.
If WANT_REG is nonzero, we wish the condition to be relative to that
register, if possible. Therefore, do not canonicalize the condition
further. If ALLOW_CC_MODE is nonzero, allow the condition returned
to be a compare to a CC mode register.
If VALID_AT_INSN_P, the condition must be valid at both *EARLIEST
and at INSN. */
rtx
canonicalize_condition (rtx insn, rtx cond, int reverse, rtx *earliest,
rtx want_reg, int allow_cc_mode, int valid_at_insn_p)
{
enum rtx_code code;
rtx prev = insn;
rtx set;
rtx tem;
rtx op0, op1;
int reverse_code = 0;
enum machine_mode mode;
code = GET_CODE (cond);
mode = GET_MODE (cond);
op0 = XEXP (cond, 0);
op1 = XEXP (cond, 1);
if (reverse)
code = reversed_comparison_code (cond, insn);
if (code == UNKNOWN)
return 0;
if (earliest)
*earliest = insn;
/* If we are comparing a register with zero, see if the register is set
in the previous insn to a COMPARE or a comparison operation. Perform
the same tests as a function of STORE_FLAG_VALUE as find_comparison_args
in cse.c */
while ((GET_RTX_CLASS (code) == RTX_COMPARE
|| GET_RTX_CLASS (code) == RTX_COMM_COMPARE)
&& op1 == CONST0_RTX (GET_MODE (op0))
&& op0 != want_reg)
{
/* Set nonzero when we find something of interest. */
rtx x = 0;
#ifdef HAVE_cc0
/* If comparison with cc0, import actual comparison from compare
insn. */
if (op0 == cc0_rtx)
{
if ((prev = prev_nonnote_insn (prev)) == 0
|| !NONJUMP_INSN_P (prev)
|| (set = single_set (prev)) == 0
|| SET_DEST (set) != cc0_rtx)
return 0;
op0 = SET_SRC (set);
op1 = CONST0_RTX (GET_MODE (op0));
if (earliest)
*earliest = prev;
}
#endif
/* If this is a COMPARE, pick up the two things being compared. */
if (GET_CODE (op0) == COMPARE)
{
op1 = XEXP (op0, 1);
op0 = XEXP (op0, 0);
continue;
}
else if (!REG_P (op0))
break;
/* Go back to the previous insn. Stop if it is not an INSN. We also
stop if it isn't a single set or if it has a REG_INC note because
we don't want to bother dealing with it. */
if ((prev = prev_nonnote_insn (prev)) == 0
|| !NONJUMP_INSN_P (prev)
|| FIND_REG_INC_NOTE (prev, NULL_RTX))
break;
set = set_of (op0, prev);
if (set
&& (GET_CODE (set) != SET
|| !rtx_equal_p (SET_DEST (set), op0)))
break;
/* If this is setting OP0, get what it sets it to if it looks
relevant. */
if (set)
{
enum machine_mode inner_mode = GET_MODE (SET_DEST (set));
#ifdef FLOAT_STORE_FLAG_VALUE
REAL_VALUE_TYPE fsfv;
#endif
/* ??? We may not combine comparisons done in a CCmode with
comparisons not done in a CCmode. This is to aid targets
like Alpha that have an IEEE compliant EQ instruction, and
a non-IEEE compliant BEQ instruction. The use of CCmode is
actually artificial, simply to prevent the combination, but
should not affect other platforms.
However, we must allow VOIDmode comparisons to match either
CCmode or non-CCmode comparison, because some ports have
modeless comparisons inside branch patterns.
??? This mode check should perhaps look more like the mode check
in simplify_comparison in combine. */
if ((GET_CODE (SET_SRC (set)) == COMPARE
|| (((code == NE
|| (code == LT
&& GET_MODE_CLASS (inner_mode) == MODE_INT
&& (GET_MODE_BITSIZE (inner_mode)
<= HOST_BITS_PER_WIDE_INT)
&& (STORE_FLAG_VALUE
& ((HOST_WIDE_INT) 1
<< (GET_MODE_BITSIZE (inner_mode) - 1))))
#ifdef FLOAT_STORE_FLAG_VALUE
|| (code == LT
&& GET_MODE_CLASS (inner_mode) == MODE_FLOAT
&& (fsfv = FLOAT_STORE_FLAG_VALUE (inner_mode),
REAL_VALUE_NEGATIVE (fsfv)))
#endif
))
&& COMPARISON_P (SET_SRC (set))))
&& (((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC))
|| mode == VOIDmode || inner_mode == VOIDmode))
x = SET_SRC (set);
else if (((code == EQ
|| (code == GE
&& (GET_MODE_BITSIZE (inner_mode)
<= HOST_BITS_PER_WIDE_INT)
&& GET_MODE_CLASS (inner_mode) == MODE_INT
&& (STORE_FLAG_VALUE
& ((HOST_WIDE_INT) 1
<< (GET_MODE_BITSIZE (inner_mode) - 1))))
#ifdef FLOAT_STORE_FLAG_VALUE
|| (code == GE
&& GET_MODE_CLASS (inner_mode) == MODE_FLOAT
&& (fsfv = FLOAT_STORE_FLAG_VALUE (inner_mode),
REAL_VALUE_NEGATIVE (fsfv)))
#endif
))
&& COMPARISON_P (SET_SRC (set))
&& (((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC))
|| mode == VOIDmode || inner_mode == VOIDmode))
{
reverse_code = 1;
x = SET_SRC (set);
}
else
break;
}
else if (reg_set_p (op0, prev))
/* If this sets OP0, but not directly, we have to give up. */
break;
if (x)
{
/* If the caller is expecting the condition to be valid at INSN,
make sure X doesn't change before INSN. */
if (valid_at_insn_p)
if (modified_in_p (x, prev) || modified_between_p (x, prev, insn))
break;
if (COMPARISON_P (x))
code = GET_CODE (x);
if (reverse_code)
{
code = reversed_comparison_code (x, prev);
if (code == UNKNOWN)
return 0;
reverse_code = 0;
}
op0 = XEXP (x, 0), op1 = XEXP (x, 1);
if (earliest)
*earliest = prev;
}
}
/* If constant is first, put it last. */
if (CONSTANT_P (op0))
code = swap_condition (code), tem = op0, op0 = op1, op1 = tem;
/* If OP0 is the result of a comparison, we weren't able to find what
was really being compared, so fail. */
if (!allow_cc_mode
&& GET_MODE_CLASS (GET_MODE (op0)) == MODE_CC)
return 0;
/* Canonicalize any ordered comparison with integers involving equality
if we can do computations in the relevant mode and we do not
overflow. */
if (GET_MODE_CLASS (GET_MODE (op0)) != MODE_CC
&& GET_CODE (op1) == CONST_INT
&& GET_MODE (op0) != VOIDmode
&& GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
{
HOST_WIDE_INT const_val = INTVAL (op1);
unsigned HOST_WIDE_INT uconst_val = const_val;
unsigned HOST_WIDE_INT max_val
= (unsigned HOST_WIDE_INT) GET_MODE_MASK (GET_MODE (op0));
switch (code)
{
case LE:
if ((unsigned HOST_WIDE_INT) const_val != max_val >> 1)
code = LT, op1 = gen_int_mode (const_val + 1, GET_MODE (op0));
break;
/* When cross-compiling, const_val might be sign-extended from
BITS_PER_WORD to HOST_BITS_PER_WIDE_INT */
case GE:
if ((HOST_WIDE_INT) (const_val & max_val)
!= (((HOST_WIDE_INT) 1
<< (GET_MODE_BITSIZE (GET_MODE (op0)) - 1))))
code = GT, op1 = gen_int_mode (const_val - 1, GET_MODE (op0));
break;
case LEU:
if (uconst_val < max_val)
code = LTU, op1 = gen_int_mode (uconst_val + 1, GET_MODE (op0));
break;
case GEU:
if (uconst_val != 0)
code = GTU, op1 = gen_int_mode (uconst_val - 1, GET_MODE (op0));
break;
default:
break;
}
}
/* Never return CC0; return zero instead. */
if (CC0_P (op0))
return 0;
return gen_rtx_fmt_ee (code, VOIDmode, op0, op1);
}
/* Given a jump insn JUMP, return the condition that will cause it to branch
to its JUMP_LABEL. If the condition cannot be understood, or is an
inequality floating-point comparison which needs to be reversed, 0 will
be returned.
If EARLIEST is nonzero, it is a pointer to a place where the earliest
insn used in locating the condition was found. If a replacement test
of the condition is desired, it should be placed in front of that
insn and we will be sure that the inputs are still valid. If EARLIEST
is null, the returned condition will be valid at INSN.
If ALLOW_CC_MODE is nonzero, allow the condition returned to be a
compare CC mode register.
VALID_AT_INSN_P is the same as for canonicalize_condition. */
rtx
get_condition (rtx jump, rtx *earliest, int allow_cc_mode, int valid_at_insn_p)
{
rtx cond;
int reverse;
rtx set;
/* If this is not a standard conditional jump, we can't parse it. */
if (!JUMP_P (jump)
|| ! any_condjump_p (jump))
return 0;
set = pc_set (jump);
cond = XEXP (SET_SRC (set), 0);
/* If this branches to JUMP_LABEL when the condition is false, reverse
the condition. */
reverse
= GET_CODE (XEXP (SET_SRC (set), 2)) == LABEL_REF
&& XEXP (XEXP (SET_SRC (set), 2), 0) == JUMP_LABEL (jump);
return canonicalize_condition (jump, cond, reverse, earliest, NULL_RTX,
allow_cc_mode, valid_at_insn_p);
}
/* Similar to above routine, except that we also put an invariant last
unless both operands are invariants. */
/* Similar to rtlanal.c:get_condition, except that we also put an
invariant last unless both operands are invariants. */
static rtx
get_condition_for_loop (const struct loop *loop, rtx x)

11
gcc/rtl.h
View file

@ -1657,6 +1657,15 @@ extern bool keep_with_call_p (rtx);
extern bool label_is_jump_target_p (rtx, rtx);
extern int insn_rtx_cost (rtx);
/* Given an insn and condition, return a canonical description of
the test being made. */
extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int, int);
/* Given a JUMP_INSN, return a canonical description of the test
being made. */
extern rtx get_condition (rtx, rtx *, int, int);
/* flow.c */
extern rtx find_use_as_address (rtx, rtx, HOST_WIDE_INT);
@ -2017,6 +2026,8 @@ extern void print_inline_rtx (FILE *, rtx, int);
/* In loop.c */
extern void init_loop (void);
extern void loop_optimize (rtx, FILE *, int);
/* In bt-load.c */
extern void branch_target_load_optimize (bool);
/* In function.c */

312
gcc/rtlanal.c
View file

@ -4333,3 +4333,315 @@ insn_rtx_cost (rtx pat)
cost = rtx_cost (SET_SRC (set), SET);
return cost > 0 ? cost : COSTS_N_INSNS (1);
}
/* Given an insn INSN and condition COND, return the condition in a
canonical form to simplify testing by callers. Specifically:
(1) The code will always be a comparison operation (EQ, NE, GT, etc.).
(2) Both operands will be machine operands; (cc0) will have been replaced.
(3) If an operand is a constant, it will be the second operand.
(4) (LE x const) will be replaced with (LT x <const+1>) and similarly
for GE, GEU, and LEU.
If the condition cannot be understood, or is an inequality floating-point
comparison which needs to be reversed, 0 will be returned.
If REVERSE is nonzero, then reverse the condition prior to canonizing it.
If EARLIEST is nonzero, it is a pointer to a place where the earliest
insn used in locating the condition was found. If a replacement test
of the condition is desired, it should be placed in front of that
insn and we will be sure that the inputs are still valid.
If WANT_REG is nonzero, we wish the condition to be relative to that
register, if possible. Therefore, do not canonicalize the condition
further. If ALLOW_CC_MODE is nonzero, allow the condition returned
to be a compare to a CC mode register.
If VALID_AT_INSN_P, the condition must be valid at both *EARLIEST
and at INSN. */
rtx
canonicalize_condition (rtx insn, rtx cond, int reverse, rtx *earliest,
rtx want_reg, int allow_cc_mode, int valid_at_insn_p)
{
enum rtx_code code;
rtx prev = insn;
rtx set;
rtx tem;
rtx op0, op1;
int reverse_code = 0;
enum machine_mode mode;
code = GET_CODE (cond);
mode = GET_MODE (cond);
op0 = XEXP (cond, 0);
op1 = XEXP (cond, 1);
if (reverse)
code = reversed_comparison_code (cond, insn);
if (code == UNKNOWN)
return 0;
if (earliest)
*earliest = insn;
/* If we are comparing a register with zero, see if the register is set
in the previous insn to a COMPARE or a comparison operation. Perform
the same tests as a function of STORE_FLAG_VALUE as find_comparison_args
in cse.c */
while ((GET_RTX_CLASS (code) == RTX_COMPARE
|| GET_RTX_CLASS (code) == RTX_COMM_COMPARE)
&& op1 == CONST0_RTX (GET_MODE (op0))
&& op0 != want_reg)
{
/* Set nonzero when we find something of interest. */
rtx x = 0;
#ifdef HAVE_cc0
/* If comparison with cc0, import actual comparison from compare
insn. */
if (op0 == cc0_rtx)
{
if ((prev = prev_nonnote_insn (prev)) == 0
|| !NONJUMP_INSN_P (prev)
|| (set = single_set (prev)) == 0
|| SET_DEST (set) != cc0_rtx)
return 0;
op0 = SET_SRC (set);
op1 = CONST0_RTX (GET_MODE (op0));
if (earliest)
*earliest = prev;
}
#endif
/* If this is a COMPARE, pick up the two things being compared. */
if (GET_CODE (op0) == COMPARE)
{
op1 = XEXP (op0, 1);
op0 = XEXP (op0, 0);
continue;
}
else if (!REG_P (op0))
break;
/* Go back to the previous insn. Stop if it is not an INSN. We also
stop if it isn't a single set or if it has a REG_INC note because
we don't want to bother dealing with it. */
if ((prev = prev_nonnote_insn (prev)) == 0
|| !NONJUMP_INSN_P (prev)
|| FIND_REG_INC_NOTE (prev, NULL_RTX))
break;
set = set_of (op0, prev);
if (set
&& (GET_CODE (set) != SET
|| !rtx_equal_p (SET_DEST (set), op0)))
break;
/* If this is setting OP0, get what it sets it to if it looks
relevant. */
if (set)
{
enum machine_mode inner_mode = GET_MODE (SET_DEST (set));
#ifdef FLOAT_STORE_FLAG_VALUE
REAL_VALUE_TYPE fsfv;
#endif
/* ??? We may not combine comparisons done in a CCmode with
comparisons not done in a CCmode. This is to aid targets
like Alpha that have an IEEE compliant EQ instruction, and
a non-IEEE compliant BEQ instruction. The use of CCmode is
actually artificial, simply to prevent the combination, but
should not affect other platforms.
However, we must allow VOIDmode comparisons to match either
CCmode or non-CCmode comparison, because some ports have
modeless comparisons inside branch patterns.
??? This mode check should perhaps look more like the mode check
in simplify_comparison in combine. */
if ((GET_CODE (SET_SRC (set)) == COMPARE
|| (((code == NE
|| (code == LT
&& GET_MODE_CLASS (inner_mode) == MODE_INT
&& (GET_MODE_BITSIZE (inner_mode)
<= HOST_BITS_PER_WIDE_INT)
&& (STORE_FLAG_VALUE
& ((HOST_WIDE_INT) 1
<< (GET_MODE_BITSIZE (inner_mode) - 1))))
#ifdef FLOAT_STORE_FLAG_VALUE
|| (code == LT
&& GET_MODE_CLASS (inner_mode) == MODE_FLOAT
&& (fsfv = FLOAT_STORE_FLAG_VALUE (inner_mode),
REAL_VALUE_NEGATIVE (fsfv)))
#endif
))
&& COMPARISON_P (SET_SRC (set))))
&& (((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC))
|| mode == VOIDmode || inner_mode == VOIDmode))
x = SET_SRC (set);
else if (((code == EQ
|| (code == GE
&& (GET_MODE_BITSIZE (inner_mode)
<= HOST_BITS_PER_WIDE_INT)
&& GET_MODE_CLASS (inner_mode) == MODE_INT
&& (STORE_FLAG_VALUE
& ((HOST_WIDE_INT) 1
<< (GET_MODE_BITSIZE (inner_mode) - 1))))
#ifdef FLOAT_STORE_FLAG_VALUE
|| (code == GE
&& GET_MODE_CLASS (inner_mode) == MODE_FLOAT
&& (fsfv = FLOAT_STORE_FLAG_VALUE (inner_mode),
REAL_VALUE_NEGATIVE (fsfv)))
#endif
))
&& COMPARISON_P (SET_SRC (set))
&& (((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC))
|| mode == VOIDmode || inner_mode == VOIDmode))
{
reverse_code = 1;
x = SET_SRC (set);
}
else
break;
}
else if (reg_set_p (op0, prev))
/* If this sets OP0, but not directly, we have to give up. */
break;
if (x)
{
/* If the caller is expecting the condition to be valid at INSN,
make sure X doesn't change before INSN. */
if (valid_at_insn_p)
if (modified_in_p (x, prev) || modified_between_p (x, prev, insn))
break;
if (COMPARISON_P (x))
code = GET_CODE (x);
if (reverse_code)
{
code = reversed_comparison_code (x, prev);
if (code == UNKNOWN)
return 0;
reverse_code = 0;
}
op0 = XEXP (x, 0), op1 = XEXP (x, 1);
if (earliest)
*earliest = prev;
}
}
/* If constant is first, put it last. */
if (CONSTANT_P (op0))
code = swap_condition (code), tem = op0, op0 = op1, op1 = tem;
/* If OP0 is the result of a comparison, we weren't able to find what
was really being compared, so fail. */
if (!allow_cc_mode
&& GET_MODE_CLASS (GET_MODE (op0)) == MODE_CC)
return 0;
/* Canonicalize any ordered comparison with integers involving equality
if we can do computations in the relevant mode and we do not
overflow. */
if (GET_MODE_CLASS (GET_MODE (op0)) != MODE_CC
&& GET_CODE (op1) == CONST_INT
&& GET_MODE (op0) != VOIDmode
&& GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
{
HOST_WIDE_INT const_val = INTVAL (op1);
unsigned HOST_WIDE_INT uconst_val = const_val;
unsigned HOST_WIDE_INT max_val
= (unsigned HOST_WIDE_INT) GET_MODE_MASK (GET_MODE (op0));
switch (code)
{
case LE:
if ((unsigned HOST_WIDE_INT) const_val != max_val >> 1)
code = LT, op1 = gen_int_mode (const_val + 1, GET_MODE (op0));
break;
/* When cross-compiling, const_val might be sign-extended from
BITS_PER_WORD to HOST_BITS_PER_WIDE_INT */
case GE:
if ((HOST_WIDE_INT) (const_val & max_val)
!= (((HOST_WIDE_INT) 1
<< (GET_MODE_BITSIZE (GET_MODE (op0)) - 1))))
code = GT, op1 = gen_int_mode (const_val - 1, GET_MODE (op0));
break;
case LEU:
if (uconst_val < max_val)
code = LTU, op1 = gen_int_mode (uconst_val + 1, GET_MODE (op0));
break;
case GEU:
if (uconst_val != 0)
code = GTU, op1 = gen_int_mode (uconst_val - 1, GET_MODE (op0));
break;
default:
break;
}
}
/* Never return CC0; return zero instead. */
if (CC0_P (op0))
return 0;
return gen_rtx_fmt_ee (code, VOIDmode, op0, op1);
}
/* Given a jump insn JUMP, return the condition that will cause it to branch
to its JUMP_LABEL. If the condition cannot be understood, or is an
inequality floating-point comparison which needs to be reversed, 0 will
be returned.
If EARLIEST is nonzero, it is a pointer to a place where the earliest
insn used in locating the condition was found. If a replacement test
of the condition is desired, it should be placed in front of that
insn and we will be sure that the inputs are still valid. If EARLIEST
is null, the returned condition will be valid at INSN.
If ALLOW_CC_MODE is nonzero, allow the condition returned to be a
compare CC mode register.
VALID_AT_INSN_P is the same as for canonicalize_condition. */
rtx
get_condition (rtx jump, rtx *earliest, int allow_cc_mode, int valid_at_insn_p)
{
rtx cond;
int reverse;
rtx set;
/* If this is not a standard conditional jump, we can't parse it. */
if (!JUMP_P (jump)
|| ! any_condjump_p (jump))
return 0;
set = pc_set (jump);
cond = XEXP (SET_SRC (set), 0);
/* If this branches to JUMP_LABEL when the condition is false, reverse
the condition. */
reverse
= GET_CODE (XEXP (SET_SRC (set), 2)) == LABEL_REF
&& XEXP (XEXP (SET_SRC (set), 2), 0) == JUMP_LABEL (jump);
return canonicalize_condition (jump, cond, reverse, earliest, NULL_RTX,
allow_cc_mode, valid_at_insn_p);
}

8
gcc/sched-deps.c
View file

@ -101,7 +101,7 @@ static void sched_analyze_1 (struct deps *, rtx, rtx);
static void sched_analyze_2 (struct deps *, rtx, rtx);
static void sched_analyze_insn (struct deps *, rtx, rtx, rtx);
static rtx get_condition (rtx);
static rtx sched_get_condition (rtx);
static int conditions_mutex_p (rtx, rtx);
/* Return nonzero if a load of the memory reference MEM can cause a trap. */
@ -138,7 +138,7 @@ find_insn_list (rtx insn, rtx list)
/* Find the condition under which INSN is executed. */
static rtx
get_condition (rtx insn)
sched_get_condition (rtx insn)
{
rtx pat = PATTERN (insn);
rtx src;
@ -218,8 +218,8 @@ add_dependence (rtx insn, rtx elem, enum reg_note dep_type)
be dependent. */
if (!CALL_P (insn) && !CALL_P (elem))
{
cond1 = get_condition (insn);
cond2 = get_condition (elem);
cond1 = sched_get_condition (insn);
cond2 = sched_get_condition (elem);
if (cond1 && cond2
&& conditions_mutex_p (cond1, cond2)
/* Make sure first instruction doesn't affect condition of second