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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100152] [10/11/12 Regression] used caller-saved register
 not preserved across a call.
Date: Mon, 03 May 2021 07:54:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100152

--- Comment #46 from Iain Sandoe <iains at gcc dot gnu.org> ---
Created attachment 50737
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50737&action=3Dedit
trial patch for testing

looking at the way other ports handle things like use of registers in venee=
rs
etc. it seems that adding to clobbers in the call lowering is a usable
mechanism.  This patch does seem the DTRT on gcc-10.3 when tested against t=
he
original code (although the patch is against master).

Otherwise, this is as yet untested ..=