https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100202
Bug ID: 100202
Summary: aarch64: UB in insv<mode> expander
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: acoplan at gcc dot gnu.org
Target Milestone: ---
Bootstrapping on aarch64 --with-build-config=bootstrap-ubsan shows the
following issue:
$ gcc/xgcc -B gcc ~/toolchain/src/gcc/gcc/testsuite/gcc.dg/torture/pr94482.c -c
-O
/home/alecop01/toolchain/src/gcc/gcc/config/aarch64/aarch64.md:5548:64: runtime
error: shift exponent 64 is too large for 64-bit type 'long unsigned int'
#0 0x3c12028 in gen_insvdi(rtx_def*, rtx_def*, rtx_def*, rtx_def*)
/home/alecop01/toolchain/src/gcc/gcc/config/aarch64/aarch64.md:5548
#1 0x1a36ee8 in maybe_expand_insn(insn_code, unsigned int, expand_operand*)
/home/alecop01/toolchain/src/gcc/gcc/optabs.c:7820
#2 0xff890c in store_bit_field_using_insv
/home/alecop01/toolchain/src/gcc/gcc/expmed.c:726
#3 0x1016db8 in store_integral_bit_field
/home/alecop01/toolchain/src/gcc/gcc/expmed.c:1056
#4 0x1016db8 in store_bit_field_1
/home/alecop01/toolchain/src/gcc/gcc/expmed.c:879
#5 0x1018794 in store_bit_field(rtx_def*, poly_int<2u, unsigned long>,
poly_int<2u, unsigned long>, poly_int<2u, unsigned long>, poly_int<2u, unsigned
long>, machine_mode, rtx_def*, bool)
/home/alecop01/toolchain/src/gcc/gcc/expmed.c:1183
#6 0x10a1264 in store_field
/home/alecop01/toolchain/src/gcc/gcc/expr.c:7353
#7 0x1094598 in expand_assignment(tree_node*, tree_node*, bool)
/home/alecop01/toolchain/src/gcc/gcc/expr.c:5482
#8 0xb35550 in expand_gimple_stmt_1
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:3910
#9 0xb35550 in expand_gimple_stmt
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:4008
#10 0xb51250 in expand_gimple_basic_block
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:6045
#11 0xb5b2b0 in execute
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:6729
#12 0x1b5ec1c in execute_one_pass(opt_pass*)
/home/alecop01/toolchain/src/gcc/gcc/passes.c:2567
#13 0x1b623b8 in execute_pass_list_1
/home/alecop01/toolchain/src/gcc/gcc/passes.c:2656
#14 0x1b624d4 in execute_pass_list(function*, opt_pass*)
/home/alecop01/toolchain/src/gcc/gcc/passes.c:2667
#15 0xc7b2a4 in cgraph_node::expand()
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:1830
#16 0xc7ff24 in expand_all_functions
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:1994
#17 0xc7ff24 in symbol_table::compile()
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:2358
#18 0xc8b81c in symbol_table::compile()
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:2271
#19 0xc8b81c in symbol_table::finalize_compilation_unit()
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:2539
#20 0x1f97478 in compile_file
/home/alecop01/toolchain/src/gcc/gcc/toplev.c:482
#21 0x68d9b0 in do_compile
/home/alecop01/toolchain/src/gcc/gcc/toplev.c:2201
#22 0x68d9b0 in toplev::main(int, char**)
/home/alecop01/toolchain/src/gcc/gcc/toplev.c:2340
#23 0x6910d0 in main /home/alecop01/toolchain/src/gcc/gcc/main.c:39
#24 0xffff7f7896dc in __libc_start_main
(/lib/aarch64-linux-gnu/libc.so.6+0x206dc)
#25 0x691b2c (/data/alecop01/builds/bstrap-ubsan/gcc/cc1+0x691b2c)
