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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91804] [10 regression] r265398 breaks
 gcc.target/powerpc/vec-rlmi-rlnm.c
Date: Wed, 01 Apr 2020 19:49:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91804

--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
The copy us inserted by IRA's find_moveable_pseudos() function.  The problem
seems to be that the new pseudo r134 has a different preferred reg class th=
an
the original pseudo r133.=20

    r134: preferred VSX_REGS, alternative NO_REGS, allocno VSX_REGS
    a7 (r134,l0) best VSX_REGS, allocno VSX_REGS
    r133: preferred ALTIVEC_REGS, alternative VSX_REGS, allocno VSX_REGS

This leads to:

...
      Popping a7(r134,l0)  -- assign reg 32
      Popping a4(r127,l0)  -- assign reg 64
      Popping a6(r133,l0)  -- assign reg 64

So r134 is assigned the first VSX reg and r133 gets the first Altivec reg.=