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[PATCH, i386]: Fix PR59952, -march=core-avx2 should not enable RTM

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: Thu, 8 May 2014 21:12:26 +0200
Subject: [PATCH, i386]: Fix PR59952, -march=core-avx2 should not enable RTM
Authentication-results: sourceware.org; auth=none

Hello!

Apparently, not all Haswell processors have TSX. Attached patch
removes PTA_RTM from default Haswell flags. PTA_HLX still makes sense
for Haswell processors, since the prefix is ignored on non-TSX
processors.

2014-05-08  Uros Bizjak  <ubizjak@gmail.com>

    PR target/59952
    * config/i386/i386.c (PTA_HASWELL): Remove PTA_RTM.

Bootstrapped and regression tested on x86_64-pc-linux-gnu. The patch
is committed on mainline, will be backported to all relevant release
branches.

Uros.

Attachment: p.diff.txt
Description: Text document

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