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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/104117] [9,10,11,12 Regression] Darwin ppc64 uses
 invalid non-PIC address to access constants (in PIC code).
Date: Thu, 20 Jan 2022 14:31:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104117

--- Comment #8 from Iain Sandoe <iains at gcc dot gnu.org> ---
Created attachment 52242
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52242&action=3Dedit
RTL from LRA

this is not legal in PIC code (the symbol ref needs to be wrapped in a
UNSPEC_MACHOPIC_OFFSET:

(insn 55 10 4 2 (set (reg:DI 2 r2 [137])
        (high:DI (symbol_ref/u:DI ("*lC0") [flags 0x2])))
"/source/test/ppc/pr104117.c":10:7 11 {macho_high_di}
     (nil))
(insn 4 55 5 2 (set (reg:DI 63 f31 [orig:122 pretmp_11+-4 ] [122])
        (mem/u/c:DI (lo_sum:DI (reg:DI 2 r2 [137])
                (symbol_ref/u:DI ("*lC0") [flags 0x2])) [0  S8 A64]))
"/source/test/ppc/pr104117.c":10:7 660 {*movdi_internal64}
     (expr_list:REG_EQUAL (const_int 1 [0x1])
        (nil)))=