https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100085
--- Comment #21 from Steven Munroe <munroesj at gcc dot gnu.org> --- Yes I was told by Peter Bergner that the fix from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100085#c15 had been back ported top AT15.0-1. But when ran this test with AT15.0-1 I saw: 0000000000000000 <test_xfer_bin128_2_vui32t_V0>: 0: 20 00 20 39 li r9,32 4: d0 ff 41 39 addi r10,r1,-48 8: 57 12 42 f0 xxswapd vs34,vs34 c: 99 4f 4a 7c stxvd2x vs34,r10,r9 10: ce 48 4a 7c lvx v2,r10,r9 14: 20 00 80 4e blr 0000000000000030 <test_xfer_bin128_2_vui64t_V0>: 30: 20 00 20 39 li r9,32 34: d0 ff 41 39 addi r10,r1,-48 38: 57 12 42 f0 xxswapd vs34,vs34 3c: 99 4f 4a 7c stxvd2x vs34,r10,r9 40: ce 48 4a 7c lvx v2,r10,r9 44: 20 00 80 4e blr 0000000000000060 <test_xfer_bin128_2_vui128t_V0>: 60: 20 00 20 39 li r9,32 64: d0 ff 41 39 addi r10,r1,-48 68: 57 12 42 f0 xxswapd vs34,vs34 6c: 99 4f 4a 7c stxvd2x vs34,r10,r9 70: 99 4e 4a 7c lxvd2x vs34,r10,r9 74: 57 12 42 f0 xxswapd vs34,vs34 78: 20 00 80 4e blr 0000000000000090 <test_xfer_bin128_2_ui128t_V0>: 90: 57 12 42 f0 xxswapd vs34,vs34 94: 20 00 40 39 li r10,32 98: d0 ff 01 39 addi r8,r1,-48 9c: f0 ff 21 39 addi r9,r1,-16 a0: 99 57 48 7c stxvd2x vs34,r8,r10 a4: 00 00 69 e8 ld r3,0(r9) a8: 08 00 89 e8 ld r4,8(r9) ac: 20 00 80 4e blr So either the patch for AT15.0-1 is not applied correctly or is non-functional because of some difference between GCC11/GCC12. Or regressed because of some other change/patch. In my experience this part of GCC is fragile (based on the long/sad history of IBM long double). So this needs to monitored with each new update.
