https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114905
Bug ID: 114905
Summary: aarch64 locally_streaming function ICE in dwarf2cfi
due to mismatched CFA instructions in
prologue/epilogue
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: matmal01 at gcc dot gnu.org
Target Milestone: ---
Bug observed (testcase + ICE) is below. I believe this happens because we use
`aarch64_add_sp` to adjust the stack pointer when `maybe_ne (sve_callee_saves,
0)` in `aarch64_expand_epilogue`. This marks the adjustment as adjusting the
CFA. However in `aarch64_expand_prologue` we might have set the CFA to the
frame pointer (instead of the stack pointer) if `frame_pointer_needed &&
frame_size.is_constant()`.
Hence when both these conditions are held we have a CFA adjust note that
affects a different register to the current CFA register.
vshcmd: > cat streaming-prologues.c
[[arm::locally_streaming,arm::streaming_compatible]] void
no_gprs_saved_very_streaming (__SVBool_t x)
{
asm ("");
}
gnu-work [13:47:36] $
vshcmd: > ${install_dir}/aarch64-none-linux-gnu-gcc \
vshcmd: > streaming-prologues.c \
vshcmd: > -fdiagnostics-plain-output -O -fomit-frame-pointer
-fstack-clash-protection\
vshcmd: > -march=armv9-a+sme -mtune=generic -moverride=tune=none \
vshcmd: > -fdump-rtl-all-all \
vshcmd: > -S -o locally_streaming_1_scp.s
gnu-work [13:47:38] $ > > > > > during RTL pass: dwarf2
dump file: locally_streaming_1_scp.c.356r.dwarf2
streaming-prologues.c: In function ‘no_gprs_saved_very_streaming’:
streaming-prologues.c:5:1: internal compiler error: in
dwarf2out_frame_debug_adjust_cfa, at dwarf2cfi.cc:1339
0xa540bd dwarf2out_frame_debug_adjust_cfa
/workspace/GNU-toolchain/fsf-trunk/src/gcc/gcc/dwarf2cfi.cc:1339
0xa540bd dwarf2out_frame_debug
/workspace/GNU-toolchain/fsf-trunk/src/gcc/gcc/dwarf2cfi.cc:2277
0xa540bd scan_insn_after
/workspace/GNU-toolchain/fsf-trunk/src/gcc/gcc/dwarf2cfi.cc:2726
0xa557e0 scan_trace
/workspace/GNU-toolchain/fsf-trunk/src/gcc/gcc/dwarf2cfi.cc:2893
0xa562cf create_cfi_notes
/workspace/GNU-toolchain/fsf-trunk/src/gcc/gcc/dwarf2cfi.cc:2938
0xa562cf execute_dwarf2_frame
/workspace/GNU-toolchain/fsf-trunk/src/gcc/gcc/dwarf2cfi.cc:3309
0xa562cf execute
/workspace/GNU-toolchain/fsf-trunk/src/gcc/gcc/dwarf2cfi.cc:3797
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
gnu-work [13:47:39] $
