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Subject: [Bug rtl-optimization/56451] New: [4.8 regression] Wrong code for gcc.c-torture/execute/941015-1.c on SH
Date: Tue, 26 Feb 2013 00:15:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56451

             Bug #: 56451
           Summary: [4.8 regression] Wrong code for
                    gcc.c-torture/execute/941015-1.c on SH
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: kkojima@gcc.gnu.org
            Target: sh*-*-*


On sh4-linux, the function foo1 of gcc.c-torture/execute/941015-1.c

int
foo1 (value)
     long long value;
{
  register const long long constant = 0xc000000080000000LL;

  if (value < constant)
    return 1;
  else
    return 2;
}

is assembled to a wrong code with -O1

foo1:
        mov.l   .L7,r1
        cmp/gt  r1,r5
        bt/s    .L10
        mov     #2,r0
        cmp/ge  r1,r5
        bf/s    .L10
        mov     #1,r0
.L10:
        rts     
        nop
.L9:
        .align 2
.L7:
        .long   -1073741824

It looks delayed branch optimization causes this.