https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109007
--- Comment #7 from bugreporter66 at gmail dot com ---
After disassembling the instruction in question is stxv at 100034b0:
0000000010003470 <_GLOBAL__sub_I_eh_alloc.cc>:
10003470: 15 10 40 3c lis r2,4117
10003474: 00 7c 42 38 addi r2,r2,31744
10003478: a6 02 08 7c mflr r0
1000347c: f0 ff c1 fb std r30,-16(r1)
10003480: f8 ff e1 fb std r31,-8(r1)
10003484: 10 00 01 f8 std r0,16(r1)
10003488: d1 ff 21 f8 stdu r1,-48(r1)
1000348c: 01 00 e0 3f lis r31,1
10003490: d0 02 00 f0 xxspltib vs0,0
10003494: 00 00 c0 3b li r30,0
10003498: 00 00 00 60 nop
1000349c: 00 1c ff 63 ori r31,r31,7168
100034a0: 00 00 00 60 nop
100034a4: f0 c7 22 39 addi r9,r2,-14352
100034a8: 78 fb e3 7f mr r3,r31
100034ac: 28 c8 e2 fb std r31,-14296(r2)
100034b0: 05 00 09 f4 stxv vs0,0(r9)
100034b4: 15 00 09 f4 stxv vs0,16(r9)
100034b8: 00 00 00 60 nop
100034bc: 10 c8 c2 fb std r30,-14320(r2)
100034c0: 29 6a 07 48 bl 10079ee8 <__libc_malloc+0x8>
