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

["rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>]

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

--- Comment #23 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 30 Jan 2024, xry111 at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113622
> 
> --- Comment #22 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
> On x86_64:
> 
> $ cat t.c
> typedef float __attribute__ ((vector_size (16))) vec;
> typedef int __attribute__ ((vector_size (16))) ivec;
> register vec a asm("xmm0"), b asm("xmm1");
> register ivec c asm("xmm2");
> 
> void
> test (void)
> {
>   for (int i = 0; i < 4; i++)
>     c[i] = a[i] < b[i] ? -1 : 1;
> }
> $ gcc/cc1 -msse2 t.c -O2 -fno-vect-cost-model -nostdinc -ffixed-xmm{0,1,2}
> 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)
>       | ^~~~
> 0x10e6d6e expand_expr_addr_expr_1
>         ../../gcc/gcc/expr.cc:9139
> 0x10e76e2 expand_expr_addr_expr
>         ../../gcc/gcc/expr.cc:9252
> 0x10f73a7 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
> expand_modifier, rtx_def**, bool)
>         ../../gcc/gcc/expr.cc:12585
> 0x10e7dc8 expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
> rtx_def**, bool)
>         ../../gcc/gcc/expr.cc:9440
> 0xef7346 expand_expr(tree_node*, rtx_def*, machine_mode, expand_modifier)
>         ../../gcc/gcc/expr.h:316
> 0x10e91fa expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
> expand_modifier)
>         ../../gcc/gcc/expr.cc:9762
> 0x10ef77d expand_expr_real_gassign(gassign*, rtx_def*, machine_mode,
> expand_modifier, rtx_def**, bool)
>         ../../gcc/gcc/expr.cc:11096
> 0xf2db31 expand_gimple_stmt_1
>         ../../gcc/gcc/cfgexpand.cc:4010
> 0xf2ddd4 expand_gimple_stmt
>         ../../gcc/gcc/cfgexpand.cc:4071
> 0xf36844 expand_gimple_basic_block
>         ../../gcc/gcc/cfgexpand.cc:6127
> 0xf38ff8 execute
>         ../../gcc/gcc/cfgexpand.cc:6866
> 
> Should I open a new ticket or add back 14 Regression to the subject?

Please open a new ticked - this seems to be another vectorizer issue.

We end up with the invalid

_28 = (sizetype) &a;