ifcvt.c (noce_emit_move_insn): New.
* ifcvt.c (noce_emit_move_insn): New. (noce_try_store_flag, noce_try_store_flag_constants, noce_try_store_flag_inc, noce_try_store_flag_mask, noce_try_cmove, noce_try_cmove_arith, noce_try_minmax, noce_try_abs): Use it. (noce_process_if_block): Likewise. For STRICT_LOW_PART, take mode from its SUBREG. * gcc.c-torture/compile/20010329-1.c: New test. From-SVN: r41001
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parent
d791ea1e0a
commit
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@ -1,3 +1,13 @@
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2001-04-02 Jakub Jelinek <jakub@redhat.com>
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* ifcvt.c (noce_emit_move_insn): New.
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(noce_try_store_flag, noce_try_store_flag_constants,
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noce_try_store_flag_inc, noce_try_store_flag_mask,
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noce_try_cmove, noce_try_cmove_arith, noce_try_minmax,
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noce_try_abs): Use it.
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(noce_process_if_block): Likewise.
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For STRICT_LOW_PART, take mode from its SUBREG.
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2001-04-02 Jakub Jelinek <jakub@redhat.com>
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* fold-const.c (fold): Before optimizing unsigned comparison with
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52
gcc/ifcvt.c
52
gcc/ifcvt.c
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@ -96,6 +96,7 @@ static int find_if_case_2 PARAMS ((basic_block, edge, edge));
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static int find_memory PARAMS ((rtx *, void *));
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static int dead_or_predicable PARAMS ((basic_block, basic_block,
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basic_block, rtx, int));
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static void noce_emit_move_insn PARAMS ((rtx, rtx));
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/* Abuse the basic_block AUX field to store the original block index,
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as well as a flag indicating that the block should be rescaned for
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@ -537,6 +538,34 @@ noce_emit_store_flag (if_info, x, reversep, normalize)
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|| code == GEU || code == GTU), normalize);
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}
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/* Emit instruction to move a rtx into STRICT_LOW_PART. */
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static void
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noce_emit_move_insn (x, y)
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rtx x, y;
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{
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enum machine_mode outmode, inmode;
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rtx outer, inner;
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int bitpos;
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if (GET_CODE (x) != STRICT_LOW_PART)
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{
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emit_move_insn (x, y);
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return;
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}
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outer = XEXP (x, 0);
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inner = XEXP (outer, 0);
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outmode = GET_MODE (outer);
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inmode = GET_MODE (inner);
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bitpos = SUBREG_WORD (outer) * BITS_PER_WORD;
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if (BYTES_BIG_ENDIAN)
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bitpos += (GET_MODE_BITSIZE (inmode) - GET_MODE_BITSIZE (outmode))
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% BITS_PER_WORD;
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store_bit_field (inner, GET_MODE_BITSIZE (outmode),
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bitpos, outmode, y, GET_MODE_BITSIZE (inmode),
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GET_MODE_BITSIZE (inmode));
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}
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/* Convert "if (test) x = 1; else x = 0".
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Only try 0 and STORE_FLAG_VALUE here. Other combinations will be
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@ -569,7 +598,7 @@ noce_try_store_flag (if_info)
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if (target)
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{
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if (target != if_info->x)
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emit_move_insn (if_info->x, target);
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noce_emit_move_insn (if_info->x, target);
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seq = get_insns ();
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end_sequence ();
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@ -692,7 +721,7 @@ noce_try_store_flag_constants (if_info)
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}
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if (target != if_info->x)
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emit_move_insn (if_info->x, target);
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noce_emit_move_insn (if_info->x, target);
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seq = get_insns ();
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end_sequence ();
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@ -751,7 +780,7 @@ noce_try_store_flag_inc (if_info)
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if (target)
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{
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if (target != if_info->x)
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emit_move_insn (if_info->x, target);
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noce_emit_move_insn (if_info->x, target);
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seq = get_insns ();
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end_sequence ();
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@ -803,7 +832,7 @@ noce_try_store_flag_mask (if_info)
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if (target)
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{
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if (target != if_info->x)
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emit_move_insn (if_info->x, target);
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noce_emit_move_insn (if_info->x, target);
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seq = get_insns ();
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end_sequence ();
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@ -902,7 +931,7 @@ noce_try_cmove (if_info)
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if (target)
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{
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if (target != if_info->x)
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emit_move_insn (if_info->x, target);
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noce_emit_move_insn (if_info->x, target);
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seq = get_insns ();
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end_sequence ();
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@ -1059,10 +1088,10 @@ noce_try_cmove_arith (if_info)
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if (MEM_ALIAS_SET (if_info->a) == MEM_ALIAS_SET (if_info->b))
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MEM_ALIAS_SET (tmp) = MEM_ALIAS_SET (if_info->a);
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emit_move_insn (if_info->x, tmp);
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noce_emit_move_insn (if_info->x, tmp);
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}
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else if (target != x)
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emit_move_insn (x, target);
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noce_emit_move_insn (x, target);
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tmp = get_insns ();
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end_sequence ();
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@ -1209,7 +1238,7 @@ noce_try_minmax (if_info)
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return FALSE;
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}
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if (target != if_info->x)
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emit_move_insn (if_info->x, target);
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noce_emit_move_insn (if_info->x, target);
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seq = get_insns ();
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end_sequence ();
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@ -1327,7 +1356,7 @@ noce_try_abs (if_info)
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}
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if (target != if_info->x)
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emit_move_insn (if_info->x, target);
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noce_emit_move_insn (if_info->x, target);
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seq = get_insns ();
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end_sequence ();
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@ -1532,7 +1561,8 @@ noce_process_if_block (test_bb, then_bb, else_bb, join_bb)
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{
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if (no_new_pseudos)
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return FALSE;
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x = gen_reg_rtx (GET_MODE (x));
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x = gen_reg_rtx (GET_MODE (GET_CODE (x) == STRICT_LOW_PART
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? XEXP (x, 0) : x));
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}
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/* Don't operate on sources that may trap or are volatile. */
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if (orig_x != x)
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{
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start_sequence ();
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emit_move_insn (orig_x, x);
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noce_emit_move_insn (orig_x, x);
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insn_b = gen_sequence ();
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end_sequence ();
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@ -1,3 +1,7 @@
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2001-04-02 Jakub Jelinek <jakub@redhat.com>
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* gcc.c-torture/compile/20010329-1.c: New test.
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2001-04-02 Jakub Jelinek <jakub@redhat.com>
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* gcc.c-torture/execute/20010329-1.c: New test.
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@ -0,0 +1,17 @@
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union u {
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unsigned char a;
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double b;
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};
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int a;
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union u foo (void)
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{
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union u b;
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if (a)
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b.a = 1;
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else
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b.a = 0;
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return b;
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}
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