Add following files as maintained within the main MIPS target
section in MAINTAINERS:

default-configs/mips64el-linux-user.mak
default-configs/mips64-linux-user.mak
default-configs/mipsn32el-linux-user.mak
default-configs/mipsn32-linux-user.mak
default-configs/mipsel-linux-user.mak
default-configs/mips-linux-user.mak
default-configs/mips64el-softmmu.mak
default-configs/mips64-softmmu.mak
default-configs/mipsel-softmmu.mak
default-configs/mips-softmmu.mak
default-configs/mips-softmmu-common.mak

Future nanoMIPS user mode will also have its .mak file, and
because of that "*mips*" was used instead of "mips*" as a
shorthand in the new item in MAINTAINERS.
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>

Host support for riscv64.
Dead code elimination pass.
Register allocation improvements.

# gpg: Signature made Tue 25 Dec 2018 20:52:34 GMT
# gpg:                using RSA key 64DF38E8AF7E215F
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>"
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-tcg-20181226: (42 commits)
  tcg: Improve call argument loading
  tcg: Record register preferences during liveness
  tcg: Add TCG_OPF_BB_EXIT
  tcg: Split out more subroutines from liveness_pass_1
  tcg: Rename and adjust liveness_pass_1 helpers
  tcg: Reindent parts of liveness_pass_1
  tcg: Dump register preference info with liveness
  tcg: Improve register allocation for matching constraints
  tcg: Add output_pref to TCGOp
  tcg: Add preferred_reg argument to tcg_reg_alloc_do_movi
  tcg: Add preferred_reg argument to temp_sync
  tcg: Add preferred_reg argument to temp_load
  tcg: Add preferred_reg argument to tcg_reg_alloc
  tcg: Add reachable_code_pass
  tcg: Reference count labels
  tcg: Add TCG_CALL_NO_RETURN
  tcg: Renumber TCG_CALL_* flags
  linux-user: Add safe_syscall for riscv64 host
  disas/microblaze: Remove unused REG_SP macro
  configure: Add support for building RISC-V host
  ...
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Free the argument register only after we have verified that the
temporary is not already in that register.  This case is likely
now that we are back propagating the preferred register.
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

With these preferences, we can arrange for function call arguments to
be computed into the proper registers instead of requiring extra moves.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Use this to notice the opcodes that exit the TB, which implies
that local temps are really dead and need not be synced.

Previously we so marked the true end of the TB, but that was
immediately overwritten by the la_bb_end invoked by any
TCG_OPF_BB_END opcode, like exit_tb.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

No need for a "tcg_" prefix for a static function; we already
have another "la_" prefix for indicating liveness analysis.
Pass in nb_globals and nb_temps, as we will already have them
in registers for other loops within the parent function.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

There are two blocks of the form

    if (foo) {
        stuff1;
        goto bar;
    } else {
    baz:
        stuff2;
    }

which have unnecessary and confusing indentation.
Remove the else and unindent stuff2.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Try harder to honor the output_pref.  When we're forced to allocate
a second register for the input, it does not need to use the input
constraint; that will be honored by the register we allocate for the
output and a move is already required.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Allocate storage for, but do not yet fill in, per-opcode
preferences for the output operands.  Pass it in to the
register allocation routines for output operands.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Pass this through to temp_sync.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Pass this through to tcg_reg_alloc.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Pass this through to tcg_reg_alloc.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

This new argument will aid register allocation by indicating how
the temporary will be used in future.  If the preference cannot
be satisfied, fall back to the constraints of the current insn.

Short circuit the preference when it cannot be satisfied or if
it does not further constrain the operation.

With an eye toward optimizing function call sequences, optimize
for the preferred_reg set containing a single register.

For the moment, all users pass 0 for preference.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Delete trivially dead code that follows unconditional branches and
noreturn helpers.  These can occur either via optimization or via
the structure of a target's translator following an exception.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Increment when adding branches, and decrement when removing them.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Remember which helpers have been marked noreturn.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Previously, the low 4 bits were used for TCG_CALL_TYPE_MASK,
which was removed in 6a18ae2d.
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Reviewed-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

This causes a build error with debian sid, riscv64 host:

disas/microblaze.c:179: error: "REG_SP" redefined [-Werror]
 #define REG_SP  1 /* stack pointer */

In file included from /usr/include/signal.h:306,
                 from include/qemu/osdep.h:101,
                 from disas/microblaze.c:36:
/usr/include/riscv64-linux-gnu/sys/ucontext.h:36: note: this is the location of the previous definition
 # define REG_SP 2
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <52160afacecc5b109dc43a412fa3e74ddd6277fb.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <caa478c8987d6042434bb9582017cdf0ea192208.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <c445175310fa836b61fd862a55628907f0093194.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <dd6e439ab81883974b8fd91f904f6de26ab5d697.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <c4d023127967a0217d8d1eabdf5de6c0e8f8c228.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <7c47f00cb4a9a777120456e0704b4076a5d943ab.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <2e047a95c39c007c66cda024c095e29b0ac4c43e.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <1a0a7e8f3347764f212c5efa5c07c9be17efdec6.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <c356657e627168d89cb5b012b7e21e4efbbe83f3.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <5665a57809e32b35775e8e98fdab898853af37b8.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <d5d88ff29163788938368bbdbd18815d59cef6a0.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <c4d2afba46efefa9388cf3205fcedbb9a5fa411f.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <bd6a45c73a67b77ddaa2fe590a6bb8ee422b9683.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <6ac4f4b0d5ea93cb0ee9a3b8b47ee9f7b3711494.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <c740aca183675625bb9cf3ce7b9e8b9d431ca694.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <d54dc56303fd1b0d7ed53869de2dbb59b111c7ca.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <dba7315e4e20e879933f72d47ccf98f1cc612b8a.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <6e43abaa64361d57b9bc9439820d0e7701f2d47e.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-Id: <a135ee1a88cd7bd08993a519d4d654da27785254.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>