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combine.c (simplify_comparison <AND>): Check TRULY_NOOP_TRUNCATION before start using a subreg. 

* combine.c (simplify_comparison <AND>): Check
	TRULY_NOOP_TRUNCATION before start using a subreg.
	
	* config/mips/mips.md (*branch_zero<mode>, 
	*branch_zero<mode>_inverted, *branch_equality<mode>, 
	*branch_equality<mode>_inverted, *branch_equality<mode>_mips16): 
	Remove mode check from comparisons.

From-SVN: r110358
This commit is contained in:
Adam Nemet 2006-01-29 03:08:38 +00:00 committed by Adam Nemet
parent 3dcf4d30e7
commit 1e84b34e74
3 changed files with 40 additions and 17 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2006-01-28 Adam Nemet <anemet@caviumnetworks.com>
* combine.c (simplify_comparison <AND>): Check
TRULY_NOOP_TRUNCATION before start using a subreg.
* config/mips/mips.md (*branch_zero<mode>,
*branch_zero<mode>_inverted, *branch_equality<mode>,
*branch_equality<mode>_inverted, *branch_equality<mode>_mips16):
Remove mode check from comparisons.
2006-01-28 Kenneth Zadeck <zadeck@naturalbridge.com>
* config/mips/mips-protos.h (mips_set_live_on_entry): Deleted.

17
gcc/combine.c
View File

@ -10295,14 +10295,27 @@ simplify_comparison (enum rtx_code code, rtx *pop0, rtx *pop1)
/* If this AND operation is really a ZERO_EXTEND from a narrower
mode, the constant fits within that mode, and this is either an
equality or unsigned comparison, try to do this comparison in
the narrower mode. */
the narrower mode.
Note that in:
(ne:DI (and:DI (reg:DI 4) (const_int 0xffffffff)) (const_int 0))
-> (ne:DI (reg:SI 4) (const_int 0))
unless TRULY_NOOP_TRUNCATION allows it or the register is
known to hold a value of the required mode the
transformation is invalid. */
if ((equality_comparison_p || unsigned_comparison_p)
&& GET_CODE (XEXP (op0, 1)) == CONST_INT
&& (i = exact_log2 ((INTVAL (XEXP (op0, 1))
& GET_MODE_MASK (mode))
+ 1)) >= 0
&& const_op >> i == 0
&& (tmode = mode_for_size (i, MODE_INT, 1)) != BLKmode)
&& (tmode = mode_for_size (i, MODE_INT, 1)) != BLKmode
&& (TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (tmode),
GET_MODE_BITSIZE (GET_MODE (op0)))
|| (REG_P (XEXP (op0, 0))
&& reg_truncated_to_mode (tmode, XEXP (op0, 0)))))
{
op0 = gen_lowpart (tmode, XEXP (op0, 0));
continue;

30
gcc/config/mips/mips.md
View File

@ -4316,9 +4316,9 @@
(define_insn "*branch_zero<mode>"
[(set (pc)
(if_then_else
(match_operator:GPR 0 "comparison_operator"
[(match_operand:GPR 2 "register_operand" "d")
(const_int 0)])
(match_operator 0 "comparison_operator"
[(match_operand:GPR 2 "register_operand" "d")
(const_int 0)])
(label_ref (match_operand 1 "" ""))
(pc)))]
"!TARGET_MIPS16"
@ -4336,9 +4336,9 @@
(define_insn "*branch_zero<mode>_inverted"
[(set (pc)
(if_then_else
(match_operator:GPR 0 "comparison_operator"
[(match_operand:GPR 2 "register_operand" "d")
(const_int 0)])
(match_operator 0 "comparison_operator"
[(match_operand:GPR 2 "register_operand" "d")
(const_int 0)])
(pc)
(label_ref (match_operand 1 "" ""))))]
"!TARGET_MIPS16"
@ -4358,9 +4358,9 @@
(define_insn "*branch_equality<mode>"
[(set (pc)
(if_then_else
(match_operator:GPR 0 "equality_operator"
[(match_operand:GPR 2 "register_operand" "d")
(match_operand:GPR 3 "register_operand" "d")])
(match_operator 0 "equality_operator"
[(match_operand:GPR 2 "register_operand" "d")
(match_operand:GPR 3 "register_operand" "d")])
(label_ref (match_operand 1 "" ""))
(pc)))]
"!TARGET_MIPS16"
@ -4378,9 +4378,9 @@
(define_insn "*branch_equality<mode>_inverted"
[(set (pc)
(if_then_else
(match_operator:GPR 0 "equality_operator"
[(match_operand:GPR 2 "register_operand" "d")
(match_operand:GPR 3 "register_operand" "d")])
(match_operator 0 "equality_operator"
[(match_operand:GPR 2 "register_operand" "d")
(match_operand:GPR 3 "register_operand" "d")])
(pc)
(label_ref (match_operand 1 "" ""))))]
"!TARGET_MIPS16"
@ -4400,9 +4400,9 @@
(define_insn "*branch_equality<mode>_mips16"
[(set (pc)
(if_then_else
(match_operator:GPR 0 "equality_operator"
[(match_operand:GPR 1 "register_operand" "d,t")
(const_int 0)])
(match_operator 0 "equality_operator"
[(match_operand:GPR 1 "register_operand" "d,t")
(const_int 0)])
(match_operand 2 "pc_or_label_operand" "")
(match_operand 3 "pc_or_label_operand" "")))]
"TARGET_MIPS16"