LoongArch: Fix vec_initv32qiv16qi template to avoid ICE.

Following test code triggers unrecognized insn ICE on LoongArch target
with "-O3 -mlasx":

void
foo (unsigned char *dst, unsigned char *src)
{
  for (int y = 0; y < 16; y++)
    {
      for (int x = 0; x < 16; x++)
        dst[x] = src[x] + 1;
      dst += 32;
      src += 32;
    }
}

ICE info:
./test.c: In function ‘foo’:
./test.c:8:1: error: unrecognizable insn:
    8 | }
      | ^
(insn 15 14 16 4 (set (reg:V32QI 185 [ vect__24.7 ])
        (vec_concat:V32QI (reg:V16QI 186)
            (const_vector:V16QI [
                    (const_int 0 [0]) repeated x16
                ]))) "./test.c":4:19 -1
     (nil))
during RTL pass: vregs
./test.c:8:1: internal compiler error: in extract_insn, at recog.cc:2791
0x12028023b _fatal_insn(char const*, rtx_def const*, char const*, int, char const*)
        /home/panchenghui/upstream/gcc/gcc/rtl-error.cc:108
0x12028026f _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/panchenghui/upstream/gcc/gcc/rtl-error.cc:116
0x120a03c5b extract_insn(rtx_insn*)
        /home/panchenghui/upstream/gcc/gcc/recog.cc:2791
0x12067ff73 instantiate_virtual_regs_in_insn
        /home/panchenghui/upstream/gcc/gcc/function.cc:1610
0x12067ff73 instantiate_virtual_regs
        /home/panchenghui/upstream/gcc/gcc/function.cc:1983
0x12067ff73 execute
        /home/panchenghui/upstream/gcc/gcc/function.cc:2030

This RTL is generated inside loongarch_expand_vector_group_init function (related
to vec_initv32qiv16qi template). Original impl doesn't ensure all vec_concat arguments
are register type. This patch adds force_reg() to the vec_concat argument generation.

gcc/ChangeLog:

	* config/loongarch/loongarch.cc (loongarch_expand_vector_group_init):
	fix impl related to vec_initv32qiv16qi template to avoid ICE.

gcc/testsuite/ChangeLog:

	* gcc.target/loongarch/vector/lasx/lasx-vec-init-1.c: New test.

0 files changed, 0 insertions, 0 deletions