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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/102107] protocol register (r12) corrupted before a tail
 call
Date: Mon, 30 Aug 2021 19:58:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102107

Segher Boessenkool <segher at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |segher at gcc dot gnu.org

--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I get (-mcpu=3Dpower10 -mabi=3Delfv2 -O2):

.L2:
        ld 9,0(30)       # 59   [c=3D8 l=3D4]  *movdi_internal64/1
        addi 1,1,112     # 124  [c=3D4 l=3D4]  *adddi3/1
        .cfi_def_cfa_offset 0
        li 3,0           # 63   [c=3D4 l=3D4]  *movdi_internal64/3
        ld 0,16(1)       # 125  [c=3D8 l=3D4]  *movdi_internal64/1
        ld 31,-8(1)      # 129  [c=3D8 l=3D4]  *movdi_internal64/1
        ld 12,0(9)       # 62   [c=3D8 l=3D4]  *movdi_internal64/1
        addi 9,9,8       # 60   [c=3D4 l=3D4]  *adddi3/1
        std 9,0(30)      # 61   [c=3D4 l=3D4]  *movdi_internal64/0
        ld 30,-16(1)     # 128  [c=3D8 l=3D4]  *movdi_internal64/1
        mtlr 0           # 127  [c=3D4 l=3D4]  *movdi_internal64/23
        .cfi_restore 65
        mtctr 12                 # 103  [c=3D4 l=3D4]  *movdi_internal64/23
        lwz 12,8(1)      # 126  [c=3D8 l=3D4]  *movsi_internal1/2
        mtcrf 8,12       # 130  [c=3D4 l=3D4]  *mtcrfsi
        .cfi_restore 72
        .cfi_restore 31
        .cfi_restore 30
        bctr             # 66   [c=3D4 l=3D4]  *sibcall_value_aixdi/1

This looks just fine.  What is wrong with your build?=