------- Comment #13 from rguenth at gcc dot gnu dot org 2008-02-01 13:04
-------
gcse-after-reload inserts
(insn 66 30 31 3 (set (reg:SF 1 dx [+4 ])
(mem/c:SF (plus:SI (reg/f:SI 6 bp)
(const_int -16 [0xfffffffffffffff0])) [0 res$imag+0 S4 A]
on the edge from bb3 to bb4, which looks correct. This insn vanishes during
184r.dse2:
DCE: Deleting insn 66
deleting insn with uid = 66.
One problem may be that gcse doesn't update LIFE:
...
(insn 30 60 66 3 test-cacoshf.c:13 (parallel [
(asm_operands/v ("") ("") 0 []
[] 1606)
(clobber (reg:QI 18 fpsr))
(clobber (reg:QI 17 flags))
(clobber (reg:QI 5 di))
(clobber (reg:QI 4 si))
(clobber (reg:QI 3 bx))
(clobber (reg:QI 2 cx))
]) -1 (nil))
(insn 66 30 31 3 (set (reg:SF 1 dx [+4 ])
(mem/c:SF (plus:SI (reg/f:SI 6 bp)
(const_int -16 [0xfffffffffffffff0])) [0 res$imag+0 S4 A8])) -1
(nil))
;; End of basic block 3 -> ( 4)
;; lr out 6 [bp] 7 [sp] 9 [st(1)] 20 [frame]
lr out doesn't include dx. Is gcse supposed to update lr out?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35045
