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i386.md (movsi_xor): Export. 

* i386.md (movsi_xor): Export.
        (setcc peep2): Use it when available; add an alternative to
        match zero_extendhisi2_and.

From-SVN: r46107
This commit is contained in:
Richard Henderson 2001-10-08 15:38:45 -07:00 committed by Richard Henderson
parent e052f1a966
commit 646ded90c6
2 changed files with 43 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2001-10-08 Richard Henderson <rth@redhat.com>
* i386.md (movsi_xor): Export.
(setcc peep2): Use it when available; add an alternative to
match zero_extendhisi2_and.
2001-10-08 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* romp-protos.h (romp_initialize_trampoline): New function.

43
gcc/config/i386/i386.md
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@ -1711,7 +1711,7 @@
[(set_attr "type" "pop")
(set_attr "mode" "SI")])
(define_insn "*movsi_xor"
(define_insn "movsi_xor"
[(set (match_operand:SI 0 "register_operand" "=r")
(match_operand:SI 1 "const0_operand" "i"))
(clobber (reg:CC 17))]
@ -13126,14 +13126,45 @@
[(reg 17) (const_int 0)]))
(set (match_operand 3 "q_regs_operand" "")
(zero_extend (match_dup 1)))]
"peep2_reg_dead_p (3, operands[1])
"(peep2_reg_dead_p (3, operands[1])
|| operands_match_p (operands[1], operands[3]))
&& ! reg_overlap_mentioned_p (operands[3], operands[0])"
[(set (match_dup 3) (const_int 0))
(set (match_dup 4) (match_dup 0))
[(set (match_dup 4) (match_dup 0))
(set (strict_low_part (match_dup 5))
(match_dup 2))]
"operands[4] = gen_rtx_REG (GET_MODE (operands[0]), 17);
operands[5] = gen_rtx_REG (QImode, REGNO (operands[3]));")
{
operands[4] = gen_rtx_REG (GET_MODE (operands[0]), 17);
operands[5] = gen_rtx_REG (QImode, REGNO (operands[3]));
if (HAVE_movsi_xor)
emit_insn (gen_movsi_xor (operands[3], const0_rtx));
else
emit_insn (gen_movsi (operands[3], const0_rtx));
})
;; Similar, but match zero_extendhisi2_and, which adds a clobber.
(define_peephole2
[(set (reg 17) (match_operand 0 "" ""))
(set (match_operand:QI 1 "register_operand" "")
(match_operator:QI 2 "ix86_comparison_operator"
[(reg 17) (const_int 0)]))
(parallel [(set (match_operand 3 "q_regs_operand" "")
(zero_extend (match_dup 1)))
(clobber (reg:CC 17))])]
"(peep2_reg_dead_p (3, operands[1])
|| operands_match_p (operands[1], operands[3]))
&& ! reg_overlap_mentioned_p (operands[3], operands[0])"
[(set (match_dup 4) (match_dup 0))
(set (strict_low_part (match_dup 5))
(match_dup 2))]
{
operands[4] = gen_rtx_REG (GET_MODE (operands[0]), 17);
operands[5] = gen_rtx_REG (QImode, REGNO (operands[3]));
if (HAVE_movsi_xor)
emit_insn (gen_movsi_xor (operands[3], const0_rtx));
else
emit_insn (gen_movsi (operands[3], const0_rtx));
})
;; Call instructions.