[Bug tree-optimization/56161] New: label: jmp label bug in 4.8.0-0.7

[hvtaifwkbgefbaei at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56161



             Bug #: 56161

           Summary: label: jmp label bug in 4.8.0-0.7

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: major

          Priority: P3

         Component: tree-optimization

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: hvtaifwkbgefb...@gmail.com





Created attachment 29314

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29314

dcraw adobe_coeff.c bug



dcraw function adobe_coeff function with -O1 or higher:



        movw    %ax, black(%rip)        # D.2960, black

.L7:

        movslq  %ebx, %rax      # i, i

        leaq    (%rax,%rax,4), %rax     #, tmp119

        movzwl  table.2869+10(,%rax,8), %eax    # table[i_40].maximum, D.2960

        testw   %ax, %ax        # D.2960

        je      .L8     #,

        movw    %ax, maximum(%rip)      # D.2960, maximum

.L8:

        movslq  %ebx, %rbx      # i, i

        leaq    (%rbx,%rbx,4), %rax     #, tmp126

        cmpw    $0, table.2869+12(,%rax,8)      #, table[i_40].trans

        je      .L5     #,

.L10:

        jmp     .L10    #

.L6:

        addl    $1, %ebx        #, i

        addq    $40, %rbp       #, ivtmp.38

        cmpl    $5, %ebx        #, i

        jne     .L11    #,

.L5:

        addq    $152, %rsp      #,

        .cfi_def_cfa_offset 40

        popq    %rbx    #





here, jmp .L10 is what I do not like very much.

with -fno-tree-dce this code generation bug does not happen.