how to configure GCC to have caller save registers instead of callee prologue

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To: gcc-help <gcc-help@xxxxxxxxxxx>
Subject: how to configure GCC to have caller save registers instead of callee prologue
From: William Tambe <tambewilliam@xxxxxxxxx>
Date: Sun, 4 Aug 2019 19:41:15 -0500

Is there a way to configure GCC so that before a function call, the
caller save any registers that it is using, instead of the callee
prologue saving registers that it is using ?

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