[Bug rtl-optimization/52883] ICE in simplify_const_unary_operation, at simplify-rtx.c:1464

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52883

--- Comment #5 from Uros Bizjak <ubizjak at gmail dot com> 2012-04-06 12:00:56 
UTC ---
(In reply to comment #4)

> It is allowed in *zero_extendsidi2_rex64, and "0" propagates into the pattern
> for some corner case. For the affected part, 4.7 generates:

Oops, this is the correct sequence:

.L3:
        movl    $0, %edx        # 66    *movsi_internal/1
        movl    %edx, %eax      # 42    *zero_extendsidi2_rex64/1
        movl    g(,%rax,4), %ebx        # 44    *movsi_internal/1
        jmp     .L8     # 62    jump    [length = 2]