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rtl.h (truncated_to_mode): Declare it. 

* rtl.h (truncated_to_mode): Declare it.
	(struct rtl_hooks): Add reg_truncated_to_mode hook.
	* rtlhooks-def.h (RTL_HOOKS_REG_TRUNCATED_TO_MODE): New macro.
	(RTL_HOOKS_INITIALIZER): Include it.
	* rtlhooks.c (reg_truncated_to_mode_general): New function.
	* combine.c (RTL_HOOKS_REG_TRUNCATED_TO_MODE): Override to
	reg_truncated_to_mode.
	* rtlanal.c (truncated_to_mode): Define it.
	* simplify-rtx.c (simplify_unary_operation_1): Use it.

Co-Authored-By: Adam Nemet <anemet@caviumnetworks.com>

From-SVN: r111573
This commit is contained in:
Paolo Bonzini 2006-02-28 20:32:20 +00:00 committed by Adam Nemet
parent e5c7f9f582
commit d3b7269024
7 changed files with 49 additions and 8 deletions
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13
gcc/ChangeLog
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@ -1,3 +1,16 @@
2006-02-28 Paolo Bonzini <bonzini@gnu.org>
Adam Nemet <anemet@caviumnetworks.com>
* rtl.h (truncated_to_mode): Declare it.
(struct rtl_hooks): Add reg_truncated_to_mode hook.
* rtlhooks-def.h (RTL_HOOKS_REG_TRUNCATED_TO_MODE): New macro.
(RTL_HOOKS_INITIALIZER): Include it.
* rtlhooks.c (reg_truncated_to_mode_general): New function.
* combine.c (RTL_HOOKS_REG_TRUNCATED_TO_MODE): Override to
reg_truncated_to_mode.
* rtlanal.c (truncated_to_mode): Define it.
* simplify-rtx.c (simplify_unary_operation_1): Use it.
2006-02-28 Jeff Law <law@redhat.com>
* tree-chrec.c (chrec_convert_aggressive): Do not eliminate

3
gcc/combine.c
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@ -457,6 +457,9 @@ static rtx gen_lowpart_or_truncate (enum machine_mode, rtx);
#undef RTL_HOOKS_REG_NUM_SIGN_BIT_COPIES
#define RTL_HOOKS_REG_NUM_SIGN_BIT_COPIES reg_num_sign_bit_copies_for_combine
#undef RTL_HOOKS_REG_TRUNCATED_TO_MODE
#define RTL_HOOKS_REG_TRUNCATED_TO_MODE reg_truncated_to_mode
static const struct rtl_hooks combine_rtl_hooks = RTL_HOOKS_INITIALIZER;

4
gcc/rtl.h
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@ -1047,6 +1047,7 @@ extern unsigned int subreg_regno (rtx);
extern unsigned HOST_WIDE_INT nonzero_bits (rtx, enum machine_mode);
extern unsigned int num_sign_bit_copies (rtx, enum machine_mode);
extern bool constant_pool_constant_p (rtx);
extern bool truncated_to_mode (enum machine_mode, rtx);
/* 1 if RTX is a subreg containing a reg that is already known to be
@ -2277,8 +2278,9 @@ struct rtl_hooks
unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT *);
rtx (*reg_num_sign_bit_copies) (rtx, enum machine_mode, rtx, enum machine_mode,
unsigned int, unsigned int *);
bool (*reg_truncated_to_mode) (enum machine_mode, rtx);
/* Whenever you add entries here, make sure you adjust hosthooks-def.h. */
/* Whenever you add entries here, make sure you adjust rtlhooks-def.h. */
};
/* Each pass can provide its own. */

10
gcc/rtlanal.c
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@ -4808,6 +4808,16 @@ get_condition (rtx jump, rtx *earliest, int allow_cc_mode, int valid_at_insn_p)
allow_cc_mode, valid_at_insn_p);
}
/* Suppose that truncation from the machine mode of X to MODE is not a
no-op. See if there is anything special about X so that we can
assume it already contains a truncated value of MODE. */
bool
truncated_to_mode (enum machine_mode mode, rtx x)
{
return REG_P (x) && rtl_hooks.reg_truncated_to_mode (mode, x);
}
/* Initialize non_rtx_starting_operands, which is used to speed up
for_each_rtx. */

3
gcc/rtlhooks-def.h
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@ -27,6 +27,7 @@ Boston, MA 02110-1301, USA. */
#define RTL_HOOKS_GEN_LOWPART_NO_EMIT gen_lowpart_no_emit_general
#define RTL_HOOKS_REG_NONZERO_REG_BITS reg_nonzero_bits_general
#define RTL_HOOKS_REG_NUM_SIGN_BIT_COPIES reg_num_sign_bit_copies_general
#define RTL_HOOKS_REG_TRUNCATED_TO_MODE reg_truncated_to_mode_general
/* The structure is defined in rtl.h. */
#define RTL_HOOKS_INITIALIZER { \
@ -34,6 +35,7 @@ Boston, MA 02110-1301, USA. */
RTL_HOOKS_GEN_LOWPART_NO_EMIT, \
RTL_HOOKS_REG_NONZERO_REG_BITS, \
RTL_HOOKS_REG_NUM_SIGN_BIT_COPIES, \
RTL_HOOKS_REG_TRUNCATED_TO_MODE, \
}
extern rtx gen_lowpart_general (enum machine_mode, rtx);
@ -45,5 +47,6 @@ extern rtx reg_nonzero_bits_general (rtx, enum machine_mode, rtx,
extern rtx reg_num_sign_bit_copies_general (rtx, enum machine_mode, rtx,
enum machine_mode,
unsigned int, unsigned int *);
extern bool reg_truncated_to_mode_general (enum machine_mode, rtx);
#endif /* GCC_RTL_HOOKS_DEF_H */

7
gcc/rtlhooks.c
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@ -117,6 +117,13 @@ reg_nonzero_bits_general (rtx x ATTRIBUTE_UNUSED,
return NULL;
}
bool
reg_truncated_to_mode_general (enum machine_mode mode ATTRIBUTE_UNUSED,
rtx x ATTRIBUTE_UNUSED)
{
return false;
}
/* Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a fixed-point
number, return an rtx (MEM, SUBREG, or CONST_INT) that refers to the
least-significant part of X.

17
gcc/simplify-rtx.c
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@ -631,14 +631,17 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
GET_MODE (XEXP (SUBREG_REG (op), 0)));
/* If we know that the value is already truncated, we can
replace the TRUNCATE with a SUBREG if TRULY_NOOP_TRUNCATION
is nonzero for the corresponding modes. But don't do this
for an (LSHIFTRT (MULT ...)) since this will cause problems
with the umulXi3_highpart patterns. */
if (TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
replace the TRUNCATE with a SUBREG. Note that this is also
valid if TRULY_NOOP_TRUNCATION is false for the corresponding
modes we just have to apply a different definition for
truncation. But don't do this for an (LSHIFTRT (MULT ...))
since this will cause problems with the umulXi3_highpart
patterns. */
if ((TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
GET_MODE_BITSIZE (GET_MODE (op)))
&& num_sign_bit_copies (op, GET_MODE (op))
>= (unsigned int) (GET_MODE_BITSIZE (mode) + 1)
? (num_sign_bit_copies (op, GET_MODE (op))
>= (unsigned int) (GET_MODE_BITSIZE (mode) + 1))
: truncated_to_mode (mode, op))
&& ! (GET_CODE (op) == LSHIFTRT
&& GET_CODE (XEXP (op, 0)) == MULT))
return rtl_hooks.gen_lowpart_no_emit (mode, op);