Bug#856809: (no subject)

[Breno Leitao <brenohl@br.ibm.com>]

There is an upstream fix for this problem, targeting both gcc trunk and GCC-6:

On GCC-6 branch it is id 246509

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r246509 | meissner | 2017-03-27 16:35:35 -0300 (Mon, 27 Mar 2017) | 42 lines

[gcc]
2017-03-27  Michael Meissner  <meissner@linux.vnet.ibm.com>

        Back port from trunk
        2017-03-27  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/78543
        * config/rs6000/rs6000.md (bswaphi2_extenddi): Combine bswap
        HImode and SImode with zero extend to DImode to one insn.
        (bswap<mode>2_extenddi): Likewise.
        (bswapsi2_extenddi): Likewise.
        (bswaphi2_extendsi): Likewise.
        (bswaphi2): Combine bswap HImode and SImode into one insn.
        Separate memory insns from swapping register.
        (bswapsi2): Likewise.
        (bswap<mode>2): Likewise.
        (bswaphi2_internal): Delete, no longer used.
        (bswapsi2_internal): Likewise.
        (bswap<mode>2_load): Split bswap HImode/SImode into separate load,
        store, and gpr<-gpr swap insns.
        (bswap<mode>2_store): Likewise.
        (bswaphi2_reg): Register only splitter, combine with the splitter.
        (bswaphi2 splitter): Likewise.
        (bswapsi2_reg): Likewise.
        (bswapsi2 splitter): Likewise.
        (bswapdi2): If we have the LDBRX and STDBRX instructions, split
        the insns into load, store, and register/register insns.
        (bswapdi2_ldbrx): Likewise.
        (bswapdi2_load): Likewise.
        (bswapdi2_store): Likewise.
        (bswapdi2_reg): Likewise.