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[PATCH, i386]: Fix PR81639, ICE in rtl_verify_bb_insns with a naked function

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Tue, 1 Aug 2017 13:07:16 +0200
Subject: [PATCH, i386]: Fix PR81639, ICE in rtl_verify_bb_insns with a naked function
Authentication-results: sourceware.org; auth=none

Hello!

Naked functions should not sibcall, since in naked functions epilogue
point (placed just above sibcal insn) is unreachable and marked with a
trap insn.

2017-08-01  Uros Bizjak  <ubizjak@gmail.com>

    PR target/81639
    * config/i386/i386.c (ix86_funciton_naked): New prototype.
    (ix86_function_ok_for_sibcall): Return false for naked functions.

testsuite/ChangeLog:

2017-08-01  Uros Bizjak  <ubizjak@gmail.com>

    PR target/81639
    * gcc.target/i386/pr81639.c: New test.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline.

Uros.

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