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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/104868] powerpc: Compiling libgfortran with -flto failing
 with GCC 12
Date: Thu, 10 Mar 2022 18:23:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104868

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

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

--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
operands[1] is "b", but is given GPR 0 here.  The instruction pattern should
handle that case.  Luckily it can just use "r" here.

=3D=3D=3D
diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index b53de1038725..a84ae5df7c0c 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -4576,7 +4576,7 @@ (define_expand "vsx_splat_<mode>"
 (define_insn "vsx_splat_<mode>_reg"
   [(set (match_operand:VSX_D 0 "vsx_register_operand" "=3Dwa,we")
        (vec_duplicate:VSX_D
-        (match_operand:<VS_scalar> 1 "gpc_reg_operand" "wa,b")))]
+        (match_operand:<VS_scalar> 1 "gpc_reg_operand" "wa,r")))]
   "VECTOR_MEM_VSX_P (<MODE>mode)"
   "@
    xxpermdi %x0,%x1,%x1,0
=3D=3D=3D

Try with that?=