https://gcc.gnu.org/g:1402e63eca3baa5271a87b2bdc67096628e7b376
commit r14-12283-g1402e63eca3baa5271a87b2bdc67096628e7b376 Author: Lulu Cheng <[email protected]> Date: Mon Jan 26 11:38:59 2026 +0800 LoongArch: Fix bug123807. In the function loongarch_expand_vector_init_same, if same is MEM and the mode of same does not match imode, it will cause an ICE in force_reg (imode, same). PR target/123807 gcc/ChangeLog: * config/loongarch/loongarch.cc (loongarch_expand_vector_init_same): When same is MEM and GET_MODE(same) != imode, first load the data from memory and then process it further. gcc/testsuite/ChangeLog: * gcc.target/loongarch/vector/lsx/pr123807.c: New test. (cherry picked from commit 4df77a254263e96af1ab4d1288a35cff10c515a4) Diff: --- gcc/config/loongarch/loongarch.cc | 11 ++++++++++- gcc/testsuite/gcc.target/loongarch/vector/lsx/pr123807.c | 10 ++++++++++ 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc index b58405631857..cf24f41a4c84 100644 --- a/gcc/config/loongarch/loongarch.cc +++ b/gcc/config/loongarch/loongarch.cc @@ -10021,7 +10021,16 @@ loongarch_expand_vector_init_same (rtx target, rtx vals, unsigned nvar) } } - temp = force_reg (imode, same); + if (GET_CODE (same) == MEM && GET_MODE (same) != imode) + { + rtx reg_tmp = gen_reg_rtx (GET_MODE (same)); + loongarch_emit_move (reg_tmp, same); + temp = lowpart_subreg (imode, reg_tmp, GET_MODE (reg_tmp)); + } + else + temp = same; + + temp = force_reg (imode, temp); switch (vmode) { diff --git a/gcc/testsuite/gcc.target/loongarch/vector/lsx/pr123807.c b/gcc/testsuite/gcc.target/loongarch/vector/lsx/pr123807.c new file mode 100644 index 000000000000..7ec514ae41aa --- /dev/null +++ b/gcc/testsuite/gcc.target/loongarch/vector/lsx/pr123807.c @@ -0,0 +1,10 @@ +/* { dg-do compile } */ +/* { dg-options "-O0 -msimd=lsx" } */ + +typedef long long v2i64 __attribute__ ((__vector_size__ (16))); +v2i64 a, b; +void +test (int imm8) +{ + b = a << imm8; +}
