http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47725
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
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CC| |ebotcazou at gcc dot
| |gnu.org
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2011-02-14 01:07:41
UTC ---
Combine changes
(insn 2 4 3 2 (set (reg/v/f:DI 59 [ pc_target ])
(zero_extend:DI (reg:SI 5 di [ pc_target ]))) u.i:9 115
{*zero_extendsidi2_rex64}
(expr_list:REG_DEAD (reg:SI 5 di [ pc_target ])
(nil)))
...
(insn 11 10 14 2 (parallel [
(set (reg:DI 64)
(const_int 0 [0]))
(set (reg/f:DI 62)
(plus:DI (ashift:DI (reg:DI 64)
(const_int 3 [0x3]))
(reg/f:DI 60)))
(set (mem/s/c:BLK (reg/f:DI 60) [0 context+0 S72 A64])
(const_int 0 [0]))
(use (reg:DI 63))
(use (reg:DI 64))
]) u.i:11 874 {*rep_stosdi_rex64}
(expr_list:REG_DEAD (reg:DI 63)
(expr_list:REG_UNUSED (reg:DI 64)
(expr_list:REG_UNUSED (reg/f:DI 62)
(nil)))))
(insn 14 11 16 2 (set (mem/s/f/c:SI (plus:DI (reg/f:DI 20 frame)
(const_int -8 [0xfffffffffffffff8])) [3 context.ra+0 S4 A64])
(subreg/s/u:SI (reg/v/f:DI 59 [ pc_target ]) 0)) u.i:12 64
{*movsi_internal}
(expr_list:REG_DEAD (reg/v/f:DI 59 [ pc_target ])
(nil)))
to
(insn 11 10 14 2 (parallel [
(set (reg:DI 64)
(const_int 0 [0]))
(set (reg/f:DI 62)
(plus:DI (ashift:DI (reg:DI 64)
(const_int 3 [0x3]))
(reg/f:DI 60)))
(set (mem/s/c:BLK (reg/f:DI 60) [0 context+0 S72 A64])
(const_int 0 [0]))
(use (reg:DI 63))
(use (reg:DI 64))
]) u.i:11 874 {*rep_stosdi_rex64}
(expr_list:REG_DEAD (reg:DI 63)
(expr_list:REG_UNUSED (reg:DI 64)
(expr_list:REG_UNUSED (reg/f:DI 62)
(nil)))))
(insn 14 11 16 2 (set (mem/s/f/c:SI (plus:DI (reg/f:DI 20 frame)
(const_int -8 [0xfffffffffffffff8])) [3 context.ra+0 S4 A64])
(reg:SI 5 di [ pc_target ])) u.i:12 64 {*movsi_internal}
(expr_list:REG_DEAD (reg:SI 5 di [ pc_target ])
(nil)))
Since *rep_stosdi_rex64 needs the RDI register, it kills
reload. Eric, should combine move hard register?
