https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108805
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |13.0
Status|UNCONFIRMED |NEW
Last reconfirmed| |2023-02-15
Component|target |rtl-optimization
Ever confirmed|0 |1
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Confirmed, combine chokes itself with the RTX it cannot chew:
(gdb) bt
#0 internal_error (gmsgid=gmsgid@entry=0x2614840 "in %s, at %s:%d") at
../../git/gcc/gcc/diagnostic.cc:2138
#1 0x0000000000891812 in fancy_abort (file=file@entry=0x20b75d8
"../../git/gcc/gcc/simplify-rtx.cc", line=line@entry=7400,
function=function@entry=0x20b74e8 "simplify_subreg") at
../../git/gcc/gcc/diagnostic.cc:2242
#2 0x00000000007653cb in simplify_context::simplify_subreg
(this=0x7fffffffd2a8, outermode=<optimized out>, op=<optimized out>,
innermode=<optimized out>, byte=...) at
../../git/gcc/gcc/simplify-rtx.cc:7400
#3 0x0000000000ecfee9 in simplify_context::simplify_gen_subreg
(this=<optimized out>, outermode=E_V4QImode, op=0x7fffea209480,
innermode=E_VOIDmode, byte=...) at ../../git/gcc/gcc/simplify-rtx.cc:7694
#4 0x0000000000ecfee9 in simplify_context::simplify_gen_subreg
(this=this@entry=0x7fffffffd2a8,
outermode=outermode@entry=E_V4QImode, op=0x7fffea3e4b58,
innermode=E_DImode, byte=...) at ../../git/gcc/gcc/simplify-rtx.cc:7694
#5 0x0000000001c92bde in simplify_gen_subreg (byte=..., innermode=<optimized
out>, op=<optimized out>, outermode=E_V4QImode)
at ../../git/gcc/gcc/rtl.h:3408
#6 if_then_else_cond (x=x@entry=0x7fffea3e4558,
ptrue=ptrue@entry=0x7fffffffd328, pfalse=pfalse@entry=0x7fffffffd338)
at ../../git/gcc/gcc/combine.cc:9375
#7 0x0000000001c929b1 in if_then_else_cond (x=x@entry=0x7fffea3e42b8,
ptrue=ptrue@entry=0x7fffffffd400,
pfalse=pfalse@entry=0x7fffffffd408) at ../../git/gcc/gcc/combine.cc:9240
#8 0x0000000001c9de0a in combine_simplify_rtx (x=0x7fffea3e42b8,
op0_mode=E_V4QImode, in_dest=0, in_cond=0)
at ../../git/gcc/gcc/combine.cc:5723
(gdb) f 3
#3 0x0000000000ecfee9 in simplify_context::simplify_gen_subreg
(this=<optimized out>, outermode=E_V4QImode, op=0x7fffea209480,
innermode=E_VOIDmode, byte=...) at ../../git/gcc/gcc/simplify-rtx.cc:7694
7694 newx = simplify_subreg (outermode, op, innermode, byte);
(gdb) p debug_rtx (op)
(const_int -1 [0xffffffffffffffff])
