http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47381
Summary: [x32] internal compiler error: in gen_lowpart_general,
at rtlhooks.c:59
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: hjl.to...@gmail.com
[hjl@gnu-6 ilp32-12]$ cat y.i
typedef unsigned long ulg;
long block_start;
typedef unsigned char uch;
extern uch window[];
unsigned strstart;
ulg flush_block (char *buf, ulg stored_len, int eof);
ulg deflate()
{
return flush_block(block_start >= 0L ?
(char*)&window[(unsigned)block_start] : (char*)((void *)0), (long)strstart -
block_start, (1));
}
[hjl@gnu-6 ilp32-12]$ make y.s
/export/build/gnu/gcc-x32/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc-x32/build-x86_64-linux/gcc/ -S -o y.s -mx32 -O2 -dp
y.i
y.i: In function ‘deflate’:
y.i:10:1: internal compiler error: in gen_lowpart_general, at rtlhooks.c:59
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make: *** [y.s] Error 1
[hjl@gnu-6 ilp32-12]$
Breakpoint 1, fancy_abort (
file=0x1245008 "/export/gnu/import/git/gcc-x32/gcc/rtlhooks.c", line=59,
function=0x1245040 "gen_lowpart_general")
at /export/gnu/import/git/gcc-x32/gcc/diagnostic.c:893
893 internal_error ("in %s, at %s:%d", function, trim_filename (file),
line);
(gdb) bt
#0 fancy_abort (
file=0x1245008 "/export/gnu/import/git/gcc-x32/gcc/rtlhooks.c", line=59,
function=0x1245040 "gen_lowpart_general")
at /export/gnu/import/git/gcc-x32/gcc/diagnostic.c:893
#1 0x000000000097dacb in gen_lowpart_general (mode=DImode, x=0x7ffff1c92e60)
at /export/gnu/import/git/gcc-x32/gcc/rtlhooks.c:59
#2 0x0000000000eb47b4 in gen_split_2389 (curr_insn=0x7ffff1a98a68,
operands=0x18af5a0)
at /export/gnu/import/git/gcc-x32/gcc/config/i386/i386.md:6092
#3 0x0000000000fdc878 in split_2 (x0=0x7ffff1af6060, insn=0x7ffff1a98a68)
at /export/gnu/import/git/gcc-x32/gcc/config/i386/i386.md:6089
#4 0x0000000000fee8ec in split_7 (x0=0x7ffff1af6060, insn=0x7ffff1a98a68)
at /export/gnu/import/git/gcc-x32/gcc/config/i386/i386.md:11194
#5 0x0000000000ff9ef7 in split_insns (x0=0x7ffff1af6060, insn=0x7ffff1a98a68)
at /export/gnu/import/git/gcc-x32/gcc/config/i386/sse.md:4647
#6 0x00000000006c3db1 in try_split (pat=0x7ffff1af6060, trial=0x7ffff1a98a68,
last=1) at /export/gnu/import/git/gcc-x32/gcc/emit-rtl.c:3415
#7 0x000000000092bf18 in split_insn (insn=0x7ffff1a98a68)
at /export/gnu/import/git/gcc-x32/gcc/recog.c:2781
#8 0x000000000092c2d0 in split_all_insns ()
at /export/gnu/import/git/gcc-x32/gcc/recog.c:2870
#9 0x000000000092df31 in rest_of_handle_split_after_reload ()
at /export/gnu/import/git/gcc-x32/gcc/recog.c:3730
---Type <return> to continue, or q <return> to quit---
#10 0x00000000008f98ab in execute_one_pass (pass=0x17b0c00)
at /export/gnu/import/git/gcc-x32/gcc/passes.c:1561
#11 0x00000000008f9a9a in execute_pass_list (pass=0x17b0c00)
at /export/gnu/import/git/gcc-x32/gcc/passes.c:1616
#12 0x00000000008f9abb in execute_pass_list (pass=0x17b07a0)
at /export/gnu/import/git/gcc-x32/gcc/passes.c:1617
#13 0x00000000008f9abb in execute_pass_list (pass=0x17b0740)
at /export/gnu/import/git/gcc-x32/gcc/passes.c:1617
#14 0x0000000000a82760 in tree_rest_of_compilation (fndecl=0x7ffff1aa7000)
at /export/gnu/import/git/gcc-x32/gcc/tree-optimize.c:422
#15 0x0000000000d22a89 in cgraph_expand_function (node=0x7ffff1aab000)
at /export/gnu/import/git/gcc-x32/gcc/cgraphunit.c:1522
#16 0x0000000000d22c48 in cgraph_expand_all_functions ()
at /export/gnu/import/git/gcc-x32/gcc/cgraphunit.c:1581
#17 0x0000000000d2327d in cgraph_optimize ()
at /export/gnu/import/git/gcc-x32/gcc/cgraphunit.c:1841
#18 0x0000000000d20db0 in cgraph_finalize_compilation_unit ()
at /export/gnu/import/git/gcc-x32/gcc/cgraphunit.c:1042
#19 0x00000000004aeb60 in c_write_global_declarations ()
at /export/gnu/import/git/gcc-x32/gcc/c-decl.c:9843
The problem is
;; Convert lea to the lea pattern to avoid flags dependency.
(define_split
[(set (match_operand 0 "register_operand" "")
(plus (match_operand 1 "register_operand" "")
(match_operand 2 "nonmemory_operand" "")))
(clobber (reg:CC FLAGS_REG))]
"reload_completed && ix86_lea_for_add_ok (insn, operands)"
[(const_int 0)]
{
rtx pat;
enum machine_mode mode = GET_MODE (operands[0]);
/* In -fPIC mode the constructs like (const (unspec [symbol_ref]))
may confuse gen_lowpart. */
if (mode != Pmode)
{
operands[1] = gen_lowpart (Pmode, operands[1]);
operands[2] = gen_lowpart (Pmode, operands[2]);
}
doesn't support
(gdb) call debug_rtx (curr_insn)
(insn 34 9 35 2 (parallel [
(set (reg:DI 1 dx [70])
(zero_extend:DI (plus:SI (reg:SI 0 ax [orig:62 block_start.2 ]
[62])
(symbol_ref:SI ("window") [flags 0x40] <var_decl
0x7ffff1aa60a0 window>))))
(clobber (reg:CC 17 flags))
]) y.i:9 255 {*addsi_1_zext}
(nil))
(gdb)
