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.
