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[Bug tree-optimization/23455] tree load PRE is not working properly



------- Comment #7 from steven at gcc dot gnu dot org  2006-01-02 21:30 -------
With an even more modified test case, load PRE does happen:

unsigned long outcnt;
extern void flush_outbuf(void);

void
bi_windup(unsigned int *outbuf, unsigned int bi_buf, unsigned long *outcnt)
{
    unsigned long t1 = *outcnt;
    outbuf[t1] = bi_buf;

    unsigned long t2 = *outcnt;
    if (t2 == 16384)
      flush_outbuf();

    unsigned long t3 = *outcnt;
    outbuf[t3] = bi_buf;
}


--> .pre tree dump

bi_windup (outbufD.1866, bi_bufD.1867, outcntD.1868)
{
  unsigned intD.3 * prephitmp.26D.1925;
  unsigned intD.3 * pretmp.25D.1924;
  long unsigned intD.4 prephitmp.24D.1923;
  long unsigned intD.4 pretmp.23D.1922;
  unsigned intD.3 storetmp.22D.1921;
  long unsigned intD.4 t3D.1873;
  long unsigned intD.4 t2D.1872;
  long unsigned intD.4 t1D.1871;
  unsigned intD.3 * D.1879;
  unsigned intD.3 * D.1878;
  long unsigned intD.4 D.1877;
  unsigned intD.3 * D.1876;
  unsigned intD.3 * D.1875;
  long unsigned intD.4 D.1874;

  # BLOCK 2 freq:10000
  # PRED: ENTRY [100.0%]  (fallthru,exec)
  #   VUSE <TMT.4D.1902_15>;
  t1D.1871_2 = *outcntD.1868_1;
  D.1874_3 = t1D.1871_2 * 4;
  D.1875_4 = (unsigned intD.3 *) D.1874_3;
  D.1876_6 = D.1875_4 + outbufD.1866_5;
  #   TMT.5D.1903_17 = V_MAY_DEF <TMT.5D.1903_16>;
  *D.1876_6 = bi_bufD.1867_7;
  if (t1D.1871_2 == 16384) goto <L0>; else goto <L2>;
  # SUCC: 3 [26.2%]  (true,exec) 5 [73.8%]  (false,exec)

  # BLOCK 5 freq:7378
  # PRED: 2 [73.8%]  (false,exec)
<L2>:;
  goto <bb 4> (<L1>);
  # SUCC: 4 [100.0%]  (fallthru)

  # BLOCK 3 freq:2622
  # PRED: 2 [26.2%]  (true,exec)
<L0>:;
  #   TMT.4D.1902_19 = V_MAY_DEF <TMT.4D.1902_15>;
  #   TMT.5D.1903_20 = V_MAY_DEF <TMT.5D.1903_17>;
  flush_outbuf ();
  #   VUSE <TMT.4D.1902_19>;
  pretmp.23D.1922_23 = *outcntD.1868_1;
  pretmp.23D.1922_25 = pretmp.23D.1922_23 * 4;
  pretmp.25D.1924_27 = (unsigned intD.3 *) pretmp.23D.1922_25;
  pretmp.25D.1924_29 = outbufD.1866_5 + pretmp.25D.1924_27;
  # SUCC: 4 [100.0%]  (fallthru,exec)

  # BLOCK 4 freq:10000
  # PRED: 5 [100.0%]  (fallthru) 3 [100.0%]  (fallthru,exec)
  # prephitmp.26D.1925_30 = PHI <D.1876_6(5), pretmp.25D.1924_29(3)>;
  # prephitmp.26D.1925_28 = PHI <D.1875_4(5), pretmp.25D.1924_27(3)>;
  # prephitmp.24D.1923_26 = PHI <D.1874_3(5), pretmp.23D.1922_25(3)>;
  # prephitmp.24D.1923_24 = PHI <t1D.1871_2(5), pretmp.23D.1922_23(3)>;
  # TMT.5D.1903_14 = PHI <TMT.5D.1903_17(5), TMT.5D.1903_20(3)>;
  # TMT.4D.1902_13 = PHI <TMT.4D.1902_15(5), TMT.4D.1902_19(3)>;
<L1>:;
  t3D.1873_9 = prephitmp.24D.1923_24;
  D.1877_10 = prephitmp.24D.1923_26;
  D.1878_11 = prephitmp.26D.1925_28;
  D.1879_12 = prephitmp.26D.1925_30;
  #   TMT.5D.1903_18 = V_MAY_DEF <TMT.5D.1903_14>;
  *D.1879_12 = bi_bufD.1867_7;
  return;
  # SUCC: EXIT [100.0%]

}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23455



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