https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71103
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |avr
Status|UNCONFIRMED |NEW
Known to work| |4.6.2
Keywords| |ice-on-valid-code
Last reconfirmed| |2016-05-21
CC| |gjl at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |4.7.2, 4.8.0, 4.9.2, 5.2.1
Severity|major |normal
--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Confirmed for 5.2.1. At .expand we have
;; MEM[(struct ResponseStruct *)&D.1574 + 1B] = &response;
(insn 6 5 7 (set (subreg:QI (reg:PSI 42 [ D.1574 ]) 1)
(subreg:QI (symbol_ref:HI ("response") [flags 0x2] <var_decl 0x228a000
response>) 0)) foo.c:11 -1
(nil))
(insn 7 6 0 (set (subreg:QI (reg:PSI 42 [ D.1574 ]) 2)
(subreg:QI (symbol_ref:HI ("response") [flags 0x2] <var_decl 0x228a000
response>) 1)) foo.c:11 -1
(nil))
hence the load of HImode &response is broken into 2 QImode leaving us with
subregs of the symbol_ref. 4.6.2 does work (presumably because there was no
PSImode in <= 4.6)
