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PR84239, Reimplement CET intrinsics for rdssp/incssp insn

From: "Tsimbalist, Igor V" <igor dot v dot tsimbalist at intel dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Uros Bizjak <ubizjak at gmail dot com>, Sandra Loosemore <sandra at codesourcery dot com>, "Tsimbalist, Igor V" <igor dot v dot tsimbalist at intel dot com>
Date: Fri, 9 Feb 2018 12:50:56 +0000
Subject: PR84239, Reimplement CET intrinsics for rdssp/incssp insn
Authentication-results: sourceware.org; auth=none
Dlp-product: dlpe-windows
Dlp-reaction: no-action
Dlp-version: 11.0.0.116

Introduce a couple of new CET intrinsics for reading and updating a shadow stack
pointer (_get_ssp and _inc_ssp), which are more user friendly. They replace the existing
_rdssp[d|q] and _incssp[d|q] instrinsics. The _get_ssp intrinsic has more deterministic
semantic: it returns a value of the shadow stack pointer if HW is CET capable and
0 otherwise.

Ok for trunk?

Igor

Attachment: 0001-Reimplement-CET-intrinsics-for-rdssp-incssp-insn.patch
Description: 0001-Reimplement-CET-intrinsics-for-rdssp-incssp-insn.patch

Follow-Ups:
- Re: PR84239, Reimplement CET intrinsics for rdssp/incssp insn
  - From: Sandra Loosemore

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