https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120839
Bug ID: 120839 Summary: ICE on x86_64-linux-gnu: in ix86_finalize_stack_frame_flags, at config/i386/i386.cc:8738 at -O1 and above with aligned on struct Product: gcc Version: 16.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: jiangchangwu at smail dot nju.edu.cn Target Milestone: --- Compiler Explorer: https://gcc.godbolt.org/z/e7M4d86c5 ******************************************************************************* gcc version: Using built-in specs. COLLECT_GCC=gcc-trunk COLLECT_LTO_WRAPPER=/home/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc/configure --disable-multilib --disable-bootstrap --enable-languages=c,c++ --prefix=/home/software/gcc-trunk --enable-coverage --disable-werror --enable-checking=yes Thread model: posix Supported LTO compression algorithms: zlib gcc version 16.0.0 20250613 (experimental) (GCC) ******************************************************************************* Program: $ cat mutant.c typedef struct { long double a, b } c __attribute__((aligned(32))); double d; void e(c f) { d = f.a; } ******************************************************************************* Command Lines: $ gcc -O1 mutant.c mutant.c:3:1: warning: no semicolon at end of struct or union 3 | } c __attribute__((aligned(32))); | ^ during RTL pass: pro_and_epilogue mutant.c: In function 'e': mutant.c:5:24: internal compiler error: in ix86_finalize_stack_frame_flags, at config/i386/i386.cc:8738 5 | void e(c f) { d = f.a; } | ^ 0x5554b38 internal_error(char const*, ...) ../../gcc/gcc/diagnostic-global-context.cc:517 0x54d2d0a fancy_abort(char const*, int, char const*) ../../gcc/gcc/diagnostic.cc:1803 0x2af82c6 ix86_finalize_stack_frame_flags ../../gcc/gcc/config/i386/i386.cc:8738 0x2b00b9e ix86_expand_epilogue(int) ../../gcc/gcc/config/i386/i386.cc:10039 0x40ca69d gen_epilogue() ../../gcc/gcc/config/i386/i386.md:21030 0x2accf69 target_gen_epilogue ../../gcc/gcc/config/i386/i386.md:20528 0x17a2a30 make_epilogue_seq ../../gcc/gcc/function.cc:6013 0x17a2c74 thread_prologue_and_epilogue_insns() ../../gcc/gcc/function.cc:6095 0x17a4f39 rest_of_handle_thread_prologue_and_epilogue ../../gcc/gcc/function.cc:6609 0x17a5387 execute ../../gcc/gcc/function.cc:6695 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.