https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116780
Bug ID: 116780
Summary: [lra][avr] internal compiler error: output_operand:
address operand requires constraint for X, Y, or Z
register
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gjl at gcc dot gnu.org
Target Milestone: ---
Created attachment 59148
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59148&action=edit
pr64088.c: C test case
$ avr-gcc pr64088.c -S -O1 -mlra -fdump-rtl-final
during RTL pass: final
dump file: pr64088.c.358r.final
pr64088.c: In function 'setup_tone_curves_center_boost':
pr64088.c:17:1: internal compiler error: output_operand: address operand
requires constraint for X, Y, or Z register
17 | }
| ^
0x6f39cc output_operand_lossage(char const*, ...)
../../../source/gcc-master/gcc/final.cc:3190
0xdf09d8 ptrreg_to_str
../../../source/gcc-master/gcc/config/avr/avr.cc:2416
0xdf0ba2 avr_print_operand_address
../../../source/gcc-master/gcc/config/avr/avr.cc:2484
0xdf17d6 avr_print_operand
../../../source/gcc-master/gcc/config/avr/avr.cc:2694
0x6f479f output_operand(rtx_def*, int)
../../../source/gcc-master/gcc/final.cc:3632
0x6f42c2 output_asm_insn(char const*, rtx_def**)
../../../source/gcc-master/gcc/final.cc:3525
0xdf0960 avr_asm_len
../../../source/gcc-master/gcc/config/avr/avr.cc:2392
0xdf7db0 out_movhi_mr_r
../../../source/gcc-master/gcc/config/avr/avr.cc:5756
0xdf46a0 output_movhi(rtx_insn*, rtx_def**, int*)
../../../source/gcc-master/gcc/config/avr/avr.cc:3981
0x6f0e7c get_insn_template(int, rtx_insn*)
../../../source/gcc-master/gcc/final.cc:2027
0x6f2a2f final_scan_insn_1
../../../source/gcc-master/gcc/final.cc:2773
0x6f2ea7 final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
../../../source/gcc-master/gcc/final.cc:2886
0x6f0ca3 final_1
../../../source/gcc-master/gcc/final.cc:1977
0x6f59af rest_of_handle_final
../../../source/gcc-master/gcc/final.cc:4240
0x6f5d0e execute
../../../source/gcc-master/gcc/final.cc:4318
0x7f2d3446ed8f __libc_start_call_main
../sysdeps/nptl/libc_start_call_main.h:58
0x7f2d3446ee3f __libc_start_main_impl
../csu/libc-start.c:392
The reason why avr.cc::ptrreg_to_str() runs into output_operand_lossage() is
that there are insns with invalid mem operands, like seen in the .final dump:
(insn 27 2 28 (parallel [
(set (mem:HI (plus:HI (reg/f:HI 32 __SP_L__)
(const_int 1 [0x1])) [1 b[0]+0 S2 A8])
(const_int 0 [0]))
(clobber (reg:CC 36 cc))
]) "pr64088.c":14:12 106 {*movhi}
(expr_list:REG_UNUSED (reg:CC 36 cc)
(nil)))
The memory location is invalid because the stack pointer (regno __SP_L__)
cannot be used to access stack slots. Indirect addressing and indirect
addressing with offset must use one of the X, Y or Z registers (regno HI:26,
HI:28, HI:30 respectively).
The code from old reload (-mno-lra) is correct: It loads SP to reg:HI 30 (Z):
(insn 28 2 29 (parallel [
(set (reg:HI 30 r30)
(reg/f:HI 32 __SP_L__))
(clobber (reg:CC 36 cc))
]) "pr64088.c":14:12 106 {*movhi}
(expr_list:REG_UNUSED (reg:CC 36 cc)
(nil)))
(insn 29 28 30 (parallel [
(set (mem:HI (plus:HI (reg:HI 30 r30)
(const_int 1 [0x1])) [1 b[0]+0 S2 A8])
(const_int 0 [0]))
(clobber (reg:CC 36 cc))
]) "pr64088.c":14:12 106 {*movhi}
(expr_list:REG_UNUSED (reg:CC 36 cc)
(nil)))
Target: avr
Configured with: ../../source/gcc-master/configure --target=avr --disable-nls
--with-dwarf2 --with-gnu-as --with-gnu-ld --disable-shared
--enable-languages=c,c++
Thread model: single
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240918 (experimental) (GCC)
