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Subject: [Bug bootstrap/55051] [4.8 Regression] profiledbootstrap failed
Date: Thu, 25 Oct 2012 00:49:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55051

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2012-10-25 00:49:09 UTC ---
LRA generates

(gdb) call debug_rtx (insn)
(insn 6 20 7 2 (set (reg/f:SI 0 ax [orig:65 gomp_tls_data.ts.work_share ] [65])
        (mem/f/j/c:SI (plus:SI (reg:SI 2 cx [68])
                (reg:DI 0 ax [64])) [0 gomp_tls_data.ts.work_share+0 S4 A32]))
/tmp/x.i:23 65 {*movsi_internal}
     (expr_list:REG_DEAD (reg:SI 2 cx [68])
        (expr_list:REG_DEAD (reg:DI 0 ax [64])
            (nil))))


from

(insn 6 5 7 2 (set (reg/f:SI 65 [ gomp_tls_data.ts.work_share ])
        (mem/f/j/c:SI (plus:DI (plus:DI (zero_extend:DI (unspec:SI [
                                (const_int 0 [0])
                            ] UNSPEC_TP))
                    (reg:DI 64))
                (const_int 4 [0x4])) [0 gomp_tls_data.ts.work_share+0 S4 A32])) 
/tmp/x.i:23 65 {*movsi_internal}
     (expr_list:REG_DEAD (reg:DI 64)
        (nil)))

It fails to properly handle zero_extend.