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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/102347] "fatal error: target specific builtin not
 available" with MMA and LTO
Date: Fri, 17 Sep 2021 14:15:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102347

--- Comment #6 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Quickly looking at the rs6000 code, it fails here:

#1  0x0000000011a0993c in rs6000_invalid_builtin
(fncode=3DMMA_BUILTIN_DISASSEMBLE_ACC_INTERNAL) at
../../gcc/config/rs6000/rs6000-call.c:11643
#2  0x0000000011a13134 in rs6000_builtin_decl (code=3D1603, initialize_p=3D=
true) at
../../gcc/config/rs6000/rs6000-call.c:13870
#3  0x00000000115c3900 in unpack_ts_function_decl_value_fields
(bp=3D0x3fffffffe2f0, expr=3D0x3fffaf195700) at ../../gcc/tree-streamer-in.=
c:361
#4  0x00000000115c4790 in streamer_read_tree_bitfields (ib=3D0x3fffffffe6a0,
data_in=3D0x132d1910, expr=3D0x3fffaf195700) at ../../gcc/tree-streamer-in.=
c:528
#5  0x0000000010deaa28 in lto_read_tree_1 (ib=3D0x3fffffffe6a0,
data_in=3D0x132d1910, expr=3D0x3fffaf195700) at ../../gcc/lto-streamer-in.c=
:1697

which relies on rs6000_builtin_mask. Note the mask is set here:
rs6000_builtin_mask =3D rs6000_builtin_mask_calculate ();

where rs6000_builtin_mask_calculate is based on TARGET_* values.

I think the mask check should be deferred later as it should be based on pr=
oper
target_node that is set via rs6000_set_current_function. It should not check
it in lto_read_tree_1.=