https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127618
Bug ID: 127618
Summary: [17 Regression] self-test failure after recent
VEC_PACK_LO/_HI over poly constants change
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: law at gcc dot gnu.org
Target Milestone: ---
Configure and try to build riscv64-elf cross toolchain with the
"--with-cpu=spacemit-x60" flag. It will fail self-tests with:
/home/jlaw/test/gcc/gcc/fold-const.cc:17815: test_vec_unpack_folding: FAIL:
ASSERT_TRUE ((lo != (tree) __null))
cc1plus: internal compiler error: in fail, at selftest.cc:48
0x333b62c internal_error(char const*, ...)
/home/jlaw/test/gcc/gcc/diagnostic-global-context.cc:787
0xe899d7 fancy_abort(char const*, int, char const*)
/home/jlaw/test/gcc/gcc/diagnostics/context.cc:1813
0x3332a27 selftest::fail(selftest::location const&, char const*)
/home/jlaw/test/gcc/gcc/selftest.cc:48
0x36bb4ec internal_error(char const*, ...)
/home/jlaw/test/gcc/gcc/diagnostic-global-context.cc:787
0xf8148f fancy_abort(char const*, int, char const*)
/home/jlaw/test/gcc/gcc/diagnostics/context.cc:1813
0x36b28e7 selftest::fail(selftest::location const&, char const*)
/home/jlaw/test/gcc/gcc/selftest.cc:48
0x12327ae test_vec_unpack_folding
/home/jlaw/test/gcc/gcc/fold-const.cc:17815
0x1232b37 selftest::fold_const_cc_tests()
/home/jlaw/test/gcc/gcc/fold-const.cc:17956
0x312b3fa selftest::run_tests()
/home/jlaw/test/gcc/gcc/selftest-run-tests.cc:108
0x168abea toplev::run_self_tests()
/home/jlaw/test/gcc/gcc/toplev.cc:2287
Bisected to:
commit 1743eb860b739c0bae408536d6a9459f2325fe18
Author: Tamar Christina <[email protected]>
Date: Wed Sep 23 07:57:01 2026 +0100
middle-end: fold VEC_UNPACK_LO/_HI over poly constants
Fold integer VEC_UNPACK_LO_EXPR and VEC_UNPACK_HI_EXPR for suitable
variable-length VECTOR_CSTs.
