[Bug target/44551] [missed optimization] AVX vextractf128 after vinsertf128

["helloqirun at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44551

Qirun Zhang <helloqirun at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |helloqirun at gmail dot com

--- Comment #15 from Qirun Zhang <helloqirun at gmail dot com> ---
This regression crashes the current trunk.


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20160211 (experimental) [trunk revision 233345] (GCC) 


$ gcc-trunk pr44551-1.c 
pr44551-1.c: In function âfooâ:
pr44551-1.c:7:1: note: The ABI for passing parameters with 32-byte alignment
has changed in GCC 4.6
 foo (__m256i x, __m128i y)
 ^~~
pr44551-1.c:7:1: warning: AVX vector argument without AVX enabled changes the
ABI [-Wpsabi]
In file included from
/home/absozero/trunk/root-gcc/lib/gcc/x86_64-pc-linux-gnu/6.0.0/include/immintrin.h:41:0,
                 from pr44551-1.c:4:
pr44551-1.c:9:15: error: â__builtin_ia32_vinsertf128_si256â needs isa option
-m32
   __m256i r = _mm256_insertf128_si256(x, y, 1);
               ^
pr44551-1.c:9:15: internal compiler error: in emit_move_insn, at expr.c:3546
0x851c6f emit_move_insn(rtx_def*, rtx_def*)
        ../../gcc/gcc/expr.c:3545
0x85859d store_expr_with_bounds(tree_node*, rtx_def*, int, bool, bool,
tree_node*)
        ../../gcc/gcc/expr.c:5583
0x859b88 expand_assignment(tree_node*, tree_node*, bool)
        ../../gcc/gcc/expr.c:5175
0x74dd8a expand_call_stmt
        ../../gcc/gcc/cfgexpand.c:2646
0x74dd8a expand_gimple_stmt_1
        ../../gcc/gcc/cfgexpand.c:3536
0x74dd8a expand_gimple_stmt
        ../../gcc/gcc/cfgexpand.c:3702
0x74fbe8 expand_gimple_basic_block
        ../../gcc/gcc/cfgexpand.c:5708
0x755bf6 execute
        ../../gcc/gcc/cfgexpand.c:6323
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