[Bug tree-optimization/113622] [11/12/13 Regression] ICE with vectors in named registers

[xry111 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113622

--- Comment #21 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
This still blows up on LoongArch even after r14-8498:

typedef float __attribute__ ((vector_size (16))) vec;
typedef int __attribute__ ((vector_size (16))) ivec;
register vec a asm("f25"), b asm("f26");
register ivec c asm("f27");

void
test (void)
{
  for (int i = 0; i < 4; i++)
    c[i] = a[i] < b[i] ? -1 : 1;
}

$ gcc/cc1 -msimd=lsx t.c -O2 -fno-vect-cost-model -nostdinc
t.c: In function ‘test’:
t.c:7:1: internal compiler error: in expand_expr_addr_expr_1, at expr.cc:9139
    7 | test (void)
      | ^~~~
0x102d7cb expand_expr_addr_expr_1
        ../../gcc/gcc/expr.cc:9139
0x102e13e expand_expr_addr_expr
        ../../gcc/gcc/expr.cc:9252
0x103df07 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        ../../gcc/gcc/expr.cc:12585
0x102e824 expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
rtx_def**, bool)
        ../../gcc/gcc/expr.cc:9440
0xe45096 expand_expr(tree_node*, rtx_def*, machine_mode, expand_modifier)
        ../../gcc/gcc/expr.h:316
0x102fc56 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        ../../gcc/gcc/expr.cc:9762
0x10361c9 expand_expr_real_gassign(gassign*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        ../../gcc/gcc/expr.cc:11096
0xe798de expand_gimple_stmt_1
        ../../gcc/gcc/cfgexpand.cc:4010
0xe79b81 expand_gimple_stmt
        ../../gcc/gcc/cfgexpand.cc:4071
0xe825e3 expand_gimple_basic_block
        ../../gcc/gcc/cfgexpand.cc:6127
0xe84b95 execute
        ../../gcc/gcc/cfgexpand.cc:6866

Interestingly -fno-vect-cost-model is needed to trigger the ICE.