i386.c (ix86_expand_clear): New.
* config/i386/i386.c (ix86_expand_clear): New. * config/i386/i386-protos.h: Declare it. * config/i386/i386.md (setcc peep2s): Use it. (movsi_xor): Unexport. From-SVN: r46404
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@ -1,3 +1,10 @@
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2001-10-22 Richard Henderson <rth@redhat.com>
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* config/i386/i386.c (ix86_expand_clear): New.
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* config/i386/i386-protos.h: Declare it.
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* config/i386/i386.md (setcc peep2s): Use it.
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(movsi_xor): Unexport.
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2001-10-22 Richard Henderson <rth@redhat.com>
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* flow.c (clear_log_links): Use free_INSN_LIST_list, not
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@ -106,6 +106,7 @@ extern const char *output_fp_compare PARAMS ((rtx, rtx*, int, int));
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extern void i386_dwarf_output_addr_const PARAMS ((FILE*, rtx));
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extern rtx i386_simplify_dwarf_addr PARAMS ((rtx));
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extern void ix86_expand_clear PARAMS ((rtx));
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extern void ix86_expand_move PARAMS ((enum machine_mode, rtx[]));
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extern void ix86_expand_binary_operator PARAMS ((enum rtx_code,
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enum machine_mode, rtx[]));
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@ -6662,6 +6662,35 @@ ix86_output_addr_diff_elt (file, value, rel)
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ASM_LONG, LPREFIX, value);
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}
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/* Generate either "mov $0, reg" or "xor reg, reg", as appropriate
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for the target. */
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void
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ix86_expand_clear (dest)
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rtx dest;
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{
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rtx tmp;
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/* We play register width games, which are only valid after reload. */
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if (!reload_completed)
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abort ();
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/* Avoid HImode and its attendant prefix byte. */
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if (GET_MODE_SIZE (GET_MODE (dest)) < 4)
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dest = gen_rtx_REG (SImode, REGNO (dest));
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tmp = gen_rtx_SET (VOIDmode, dest, const0_rtx);
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/* This predicate should match that for movsi_xor and movdi_xor_rex64. */
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if (reload_completed && (!TARGET_USE_MOV0 || optimize_size))
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{
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rtx clob = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (CCmode, 17));
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tmp = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2, tmp, clob));
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}
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emit_insn (tmp);
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}
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void
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ix86_expand_move (mode, operands)
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enum machine_mode mode;
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@ -1711,7 +1711,7 @@
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[(set_attr "type" "pop")
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(set_attr "mode" "SI")])
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(define_insn "movsi_xor"
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(define_insn "*movsi_xor"
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[(set (match_operand:SI 0 "register_operand" "=r")
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(match_operand:SI 1 "const0_operand" "i"))
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(clobber (reg:CC 17))]
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@ -13277,10 +13277,7 @@
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{
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operands[4] = gen_rtx_REG (GET_MODE (operands[0]), 17);
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operands[5] = gen_rtx_REG (QImode, REGNO (operands[3]));
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if (HAVE_movsi_xor)
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emit_insn (gen_movsi_xor (operands[3], const0_rtx));
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else
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emit_insn (gen_movsi (operands[3], const0_rtx));
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ix86_expand_clear (operands[3]);
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})
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;; Similar, but match zero_extendhisi2_and, which adds a clobber.
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@ -13302,10 +13299,7 @@
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{
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operands[4] = gen_rtx_REG (GET_MODE (operands[0]), 17);
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operands[5] = gen_rtx_REG (QImode, REGNO (operands[3]));
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if (HAVE_movsi_xor)
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emit_insn (gen_movsi_xor (operands[3], const0_rtx));
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else
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emit_insn (gen_movsi (operands[3], const0_rtx));
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ix86_expand_clear (operands[3]);
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})
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;; Call instructions.
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