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[Patch, microblaze]: Fix bswaphi2 implementation

From: David Holsgrove <david dot holsgrove at xilinx dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Michael Eager <eager at eagerm dot com>, Edgar Iglesias <edgari at xilinx dot com>, John Williams <jwilliams at xilinx dot com>, Vinod Kathail <vinodk at xilinx dot com>, Vidhumouli Hunsigida <vidhum at xilinx dot com>, Nagaraju Mekala <nmekala at xilinx dot com>, Tom Shui <tshui at xilinx dot com>
Date: Mon, 15 Jul 2013 14:49:43 +1000
Subject: [Patch, microblaze]: Fix bswaphi2 implementation

MicroBlaze insn swaph swaps the contents of register rA as two
halfwords placing result in rD;

(rD)[0:15]  <- (rA)[16:31]
(rD)[16:31] <- (rA)[0:15]

gcc bswaphi2 is intended to reverse the order of the bytes in the
half integer in rA

(rD)[8:15]  <- (rA)[0:7]
(rD)[7:0]   <- (rA)[8:15]
(rD)[24:31] <- (rA)[16:23]
(rD)[16:23] <- (rA)[24:31]

Correct the microblaze bswaphi2 insn pattern to be a swapb followed
by swaph

Changelog entry would be:

2013-07-15  David Holsgrove <david.holsgrove@xilinx.com>

 * gcc/config/microblaze/microblaze.md: Fix bswaphi2


Can this also be backported to the gcc-4_8-branch?

thanks,
David

Attachment: 0002-Patch-microblaze-Fix-bswaphi2-implementation.patch
Description: Binary data

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