https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105333
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2022-04-21
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
CC| |segher at gcc dot gnu.org
Target Milestone|--- |10.4
Priority|P3 |P2
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
#1 0x000000000142c6af in simplify_context::simplify_subreg (
this=0x7fffffffb3b8, outermode=E_SImode, op=0x7ffff668b5d0,
innermode=E_VOIDmode, byte=...)
(gdb) p debug_rtx( op)
(const_wide_int 0x0fffffffffffffffe)
(gdb) bt
#0 fancy_abort (
file=0x2e7a200 "/home/rguenther/src/gcc3/gcc/simplify-rtx.cc", line=7346,
function=0x2e7e100 <simplify_context::simplify_subreg(machine_mode,
rtx_def*, machine_mode, poly_int<1u, unsigned long>)::__FUNCTION__>
"simplify_subreg")
at /home/rguenther/src/gcc3/gcc/diagnostic.cc:2024
#1 0x000000000142c6af in simplify_context::simplify_subreg (
this=0x7fffffffb3b8, outermode=E_SImode, op=0x7ffff668b5d0,
innermode=E_VOIDmode, byte=...)
at /home/rguenther/src/gcc3/gcc/simplify-rtx.cc:7346
#2 0x000000000142cf56 in simplify_context::simplify_subreg (
this=0x7fffffffb3b8, outermode=E_SImode, op=0x7ffff668b660,
innermode=E_DImode, byte=...)
at /home/rguenther/src/gcc3/gcc/simplify-rtx.cc:7444
#3 0x000000000142dfd9 in simplify_context::simplify_gen_subreg (
this=0x7fffffffb3b8, outermode=E_SImode, op=0x7ffff668b660,
innermode=E_DImode, byte=...)
at /home/rguenther/src/gcc3/gcc/simplify-rtx.cc:7624
...
#7 0x00000000028becb7 in gen_lowpart_for_combine (omode=E_SImode,
x=0x7ffff668b660) at /home/rguenther/src/gcc3/gcc/combine.cc:11684
11684 result = gen_lowpart_common (omode, x);
#8 0x0000000001410622 in simplify_context::simplify_unary_operation_1 (
this=0x7fffffffc988, code=TRUNCATE, mode=E_SImode, op=0x7ffff668b660)
at /home/rguenther/src/gcc3/gcc/simplify-rtx.cc:1243
which does
if (GET_MODE (op) != VOIDmode)
{
temp = simplify_truncation (mode, op, GET_MODE (op));
if (temp)
return temp;
}
/* If we know that the value is already truncated, we can
replace the TRUNCATE with a SUBREG. */
if (known_eq (GET_MODE_NUNITS (mode), 1)
&& (TRULY_NOOP_TRUNCATION_MODES_P (mode, GET_MODE (op))
|| truncated_to_mode (mode, op)))
{
temp = rtl_hooks.gen_lowpart_no_emit (mode, op);
so we know 'op' is VOIDmode here but gen_lowpart_for_combine isn't
prepared for this?
