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i386.md (zeroing peephole2): Use general_reg_operand. 

* config/i386/i386.md (zeroing peephole2): Use general_reg_operand.
	(or $-1,reg peephole2): Ditto.
	(strict_low_part zeroing peephole2): Use SWI12 mode iterator.

From-SVN: r235581
This commit is contained in:
Uros Bizjak 2016-04-28 18:35:03 +02:00
parent 893100c3fa
commit e41ebdf1c8
2 changed files with 13 additions and 11 deletions
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8
gcc/ChangeLog
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@ -1,4 +1,10 @@
2016-04-28 Markus Trippelsdorf <markus@trippelsdorf.de>
2016-04-28 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (zeroing peephole2): Use general_reg_operand.
(or $-1,reg peephole2): Ditto.
(strict_low_part zeroing peephole2): Use SWI12 mode iterator.
2016-04-28 Markus Trippelsdorf <markus@trippelsdorf.de>
* doc/extend.texi (Common Function Attributes) [optimize]:
Discourage use of the optimize attribute.

16
gcc/config/i386/i386.md
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@ -18124,34 +18124,30 @@
copy_rtx (operands[2]));
})
;; Attempt to always use XOR for zeroing registers.
;; Attempt to always use XOR for zeroing registers (including FP modes).
(define_peephole2
[(set (match_operand 0 "register_operand")
[(set (match_operand 0 "general_reg_operand")
(match_operand 1 "const0_operand"))]
"GET_MODE_SIZE (GET_MODE (operands[0])) <= UNITS_PER_WORD
&& (! TARGET_USE_MOV0 || optimize_insn_for_size_p ())
&& GENERAL_REGNO_P (REGNO (operands[0]))
&& peep2_regno_dead_p (0, FLAGS_REG)"
[(parallel [(set (match_dup 0) (const_int 0))
(clobber (reg:CC FLAGS_REG))])]
"operands[0] = gen_lowpart (word_mode, operands[0]);")
(define_peephole2
[(set (strict_low_part (match_operand 0 "register_operand"))
[(set (strict_low_part (match_operand:SWI12 0 "general_reg_operand"))
(const_int 0))]
"(GET_MODE (operands[0]) == QImode
|| GET_MODE (operands[0]) == HImode)
&& (! TARGET_USE_MOV0 || optimize_insn_for_size_p ())
"(! TARGET_USE_MOV0 || optimize_insn_for_size_p ())
&& peep2_regno_dead_p (0, FLAGS_REG)"
[(parallel [(set (strict_low_part (match_dup 0)) (const_int 0))
(clobber (reg:CC FLAGS_REG))])])
;; For HI, SI and DI modes, or $-1,reg is smaller than mov $-1,reg.
(define_peephole2
[(set (match_operand:SWI248 0 "register_operand")
[(set (match_operand:SWI248 0 "general_reg_operand")
(const_int -1))]
"(optimize_insn_for_size_p () || TARGET_MOVE_M1_VIA_OR)
&& GENERAL_REGNO_P (REGNO (operands[0]))
"(TARGET_MOVE_M1_VIA_OR || optimize_insn_for_size_p ())
&& peep2_regno_dead_p (0, FLAGS_REG)"
[(parallel [(set (match_dup 0) (const_int -1))
(clobber (reg:CC FLAGS_REG))])]