[Bug tree-optimization/42494] [4.4 Regression] Missed dead-code-elimination

[lacombar at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42494

--- Comment #15 from Arnaud Lacombe <lacombar at gmail dot com> 2011-05-13 20:14:08 UTC ---
trunk from early May also fails with one more "if (outcnt == 1) func ();" line
at the end of the function:

% ./gcc/cc1 -Os -o - test.c

        .file   "test.c"
 test
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> <visibility> <early_local_cleanups> <whole-program>
<ipa-profile> <cp> <inline> <pure-const> <static-var>Assembling functions:
 test   .text
        .globl  test
        .type   test, @function
test:
.LFB0:
        .cfi_startproc
        movl    $0, outcnt(%rip)
        cmpl    $0, outcnt(%rip)
        je      .L1
        xorl    %eax, %eax
        jmp     func
.L1:
        ret
        .cfi_endproc
.LFE0:
        .size   test, .-test
        .ident  "GCC: (GNU) 4.7.0 20110416 (experimental)"
        .section        .note.GNU-stack,"",@progbits

Target and host are x86-64-linux. -O2 and above are fine.