https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66358
--- Comment #17 from David Binderman <dcb314 at hotmail dot com> ---
I had a go at cross compiling Linux kernel for sh, and got something similar
with gcc 5.1.1 dated 20150618
$ sh-linux-gnu-gcc -c -O2 bug224.c
drivers/hwmon/w83627ehf.c: In function ‘show_caseopen’:
drivers/hwmon/w83627ehf.c:1774:1: error: insn does not satisfy its constraints:
(insn 135 111 136 2 (set:SI (reg:SI 1 r1)
(sign_extend:SI (mem:QI (plus:SI (reg/f:SI 8 r8 [175])
(const_int 12 [0xc])) [0 MEM[(struct
sensor_device_attribute_2 *)attr_6(D)].index+0 S1 A32])))
drivers/hwmon/w83627ehf.c:1772 231 {*extendqisi2_compact_mem_disp}
(nil))
drivers/hwmon/w83627ehf.c:1774:1: internal compiler error: in
extract_constrain_insn, at recog.c:2246
Problem seems to go away when I add flag -mlra, so I have a workaround.
Test case attached.
