------- Comment #2 from hjl dot tools at gmail dot com 2010-06-28 21:57 -------
I think it is a latent bug exposed by revision 161329. Now
x86 backend may generate:
(ior:HI (ashift:HI (zero_extend:HI (umod:QI (reg:HI 68)
(reg:QI 61 [ D.2750 ])))
(const_int 8 [0x8]))
(zero_extend:HI (udiv:QI (reg:HI 68)
(reg:QI 61 [ D.2750 ]))))
Combine ran into trouble:
(gdb) bt
#0 fancy_abort (
file=0x11e5860 "/export/gnu/import/git/gcc/gcc/simplify-rtx.c", line=5117,
function=0x11e6be0 "simplify_subreg")
at /export/gnu/import/git/gcc/gcc/diagnostic.c:879
#1 0x00000000009d76ad in simplify_subreg (outermode=HImode,
op=0x7ffff1d04f00, innermode=QImode, byte=0)
at /export/gnu/import/git/gcc/gcc/simplify-rtx.c:5116
#2 0x00000000009d87e6 in simplify_gen_subreg (outermode=HImode,
op=0x7ffff1d04f00, innermode=QImode, byte=0)
at /export/gnu/import/git/gcc/gcc/simplify-rtx.c:5426
#3 0x0000000000fcc60a in if_then_else_cond (x=0x7ffff1b6d390,
ptrue=0x7fffffffd448, pfalse=0x7fffffffd438)
at /export/gnu/import/git/gcc/gcc/combine.c:8219
#4 0x0000000000fcbf66 in if_then_else_cond (x=0x7ffff1b6d3a8,
ptrue=0x7fffffffd4d0, pfalse=0x7fffffffd4c8)
at /export/gnu/import/git/gcc/gcc/combine.c:8103
#5 0x0000000000fc305a in combine_simplify_rtx (x=0x7ffff1b6d3a8,
op0_mode=VOIDmode, in_dest=0)
at /export/gnu/import/git/gcc/gcc/combine.c:4864
#6 0x0000000000fc2def in subst (x=0x7ffff1b6d3a8, from=0x7ffff1c170c0,
to=0x7ffff1c170c0, in_dest=0, unique_copy=0)
at /export/gnu/import/git/gcc/gcc/combine.c:4803
#7 0x0000000000fc2ba7 in subst (x=0x7ffff1b64720, from=0x7ffff1c170c0,
---Type <return> to continue, or q <return> to quit---
to=0x7ffff1c170c0, in_dest=0, unique_copy=0)
at /export/gnu/import/git/gcc/gcc/combine.c:4741
#8 0x0000000000fc2ba7 in subst (x=0x7ffff1b64738, from=0x7ffff1c170c0,
to=0x7ffff1c170c0, in_dest=0, unique_copy=0)
at /export/gnu/import/git/gcc/gcc/combine.c:4741
#9 0x0000000000fbd20b in try_combine (i3=0x7ffff1b0a870, i2=0x7ffff1b0a798,
i1=0x0, new_direct_jump_p=0x7fffffffdaf4)
at /export/gnu/import/git/gcc/gcc/combine.c:2885
#10 0x0000000000fb911e in combine_instructions (f=0x7ffff1c227c0, nregs=70)
at /export/gnu/import/git/gcc/gcc/combine.c:1152
#11 0x0000000000fd898f in rest_of_handle_combine ()
at /export/gnu/import/git/gcc/gcc/combine.c:13342
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl dot tools at gmail dot
| |com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44695
