Commit graph

2748 commits

Author SHA1 Message Date
Mathieu Bridon
022d2a381d python: Better use iterators
In Python 2, iterators had a .next() method.

In Python 3, instead they have a .__next__() method, which is
automatically called by the next() builtin.

In addition, it is better to use the iter() builtin to create an
iterator, rather than calling its __iter__() method.

These were also introduced in Python 2.6, so using it makes the script
compatible with Python 2 and 3.

Signed-off-by: Mathieu Bridon <bochecha@daitauha.fr>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
2018-07-24 11:07:04 -07:00
Mathieu Bridon
5530cb1296 python: Better iterate over dictionaries
In Python 2, dictionaries have 2 sets of methods to iterate over their
keys and values: keys()/values()/items() and iterkeys()/itervalues()/iteritems().

The former return lists while the latter return iterators.

Python 3 dropped the method which return lists, and renamed the methods
returning iterators to keys()/values()/items().

Using those names makes the scripts compatible with both Python 2 and 3.

Signed-off-by: Mathieu Bridon <bochecha@daitauha.fr>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
2018-07-24 11:07:04 -07:00
Daniel Schürmann
87989339a0 nir: add 16bit type information to glsl types
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
2018-07-23 23:16:25 +02:00
Jason Ekstrand
e4d346c86d nir: Add a couple trivial abs optimizations
Spotted in a shader in Batman: Arkham City.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
2018-07-23 10:48:21 -07:00
Caio Marcelo de Oliveira Filho
52d831ff83 glsl: remove delegating constructors to allow build with C++98
Delegating constructors is a C++11 feature, so this was breaking when
compiling with C++98. Change the copy_propagation_state() calls that
used the convenience constructor to use a static member function
instead.

Since copy_propagation_state is expected to be heap allocated, this
change is a good fit.

Tested-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107305
2018-07-23 10:34:43 -07:00
Ilia Mirkin
768f143667 spirv: add support for SPV_KHR_post_depth_coverage
Allow the capability to be exposed, and convert the new execution mode
into fs state.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
2018-07-22 14:56:36 -07:00
Chih-Wei Huang
e7ffd3fb08 Android: fix a missing nir_intrinsics.h error
The commit 76dfed8ae2 changed nir_intrinsics.h to be a generated
header, but the corresponding dependency was not updated for Android.
It causes the error:

[  0% 19/4336] target  C: libmesa_pipe_radeonsi <= external/mesa/src/gallium/drivers/radeonsi/si_debug.c
...
In file included from external/mesa/src/gallium/drivers/radeonsi/si_debug.c:25:
In file included from external/mesa/src/gallium/drivers/radeonsi/si_pipe.h:28:
In file included from external/mesa/src/gallium/drivers/radeonsi/si_shader.h:140:
In file included from external/mesa/src/amd/common/ac_llvm_build.h:30:
external/mesa/src/compiler/nir/nir.h:966:10: fatal error: 'nir_intrinsics.h' file not found
         ^~~~~~~~~~~~~~~~~~
1 error generated.

Fixes: 76dfed8ae2 ("nir: mako all the intrinsics")
Signed-off-by: Chih-Wei Huang <cwhuang@linux.org.tw>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Mauro Rossi <issor.oruam@gmail.com>
2018-07-21 08:50:23 +02:00
Bas Nieuwenhuizen
e1febbefe8 nir: Fix end of function without return warning/error.
There always is a continue block, so let us just do unreachable.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Fixes: 8cacf38f52 "nir: Do not use continue block after removing it."
CC: 18.1 <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107312
2018-07-20 22:27:39 +02:00
Bas Nieuwenhuizen
8cacf38f52 nir: Do not use continue block after removing it.
Reinserting code directly before a jump means the block gets split
and merged, removing the original block and replacing it in the
process.

Hence keeping a pointer to the continue block over a reinsert
causes issues.

This code changes nir_opt_if to simply look for the new continue
block.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107275
CC: 18.1 <mesa-stable@lists.freedesktop.org>
2018-07-20 12:09:19 +02:00
Caio Marcelo de Oliveira Filho
507a8037a7 glsl: don't let an 'if' then-branch kill copy propagation (elements) for else-branch
When handling 'if' in copy propagation elements, if a certain variable
was killed when processing the first branch of the 'if', then the
second would get any propagation from previous nodes.

    x = y;
    if (...) {
        z = x;  // This would turn into z = y.
        x = 22; // x gets killed.
    } else {
        w = x;  // This would NOT turn into w = y.
    }

With the change, we let copy propagation happen independently in the
two branches and only then apply the killed values for the subsequent
code.

One example in shader-db part of shaders/unity/8.shader_test:

    (assign  (xyz) (var_ref col_1)  (var_ref tmpvar_8) )
    (if (expression bool < (swiz y (var_ref xlv_TEXCOORD0) )(constant float (0.000000)) ) (
      (assign  (xyz) (var_ref col_1)  (expression vec3 + (var_ref tmpvar_8) ... ) ... )
    )
    (
      (assign  (xyz) (var_ref col_1)  (expression vec3 lrp (var_ref col_1) ... ) ... )
    ))

The variable col_1 was replaced by tmpvar_8 in the then-part but not
in the else-part.

NIR deals well with copy propagation, so it already covered for the
missing ones that this patch fixes.

Reviewed-by: Eric Anholt <eric@anholt.net>
2018-07-19 10:00:59 -07:00
Caio Marcelo de Oliveira Filho
e4f32dec23 glsl: change opt_copy_propagation_elements data structures
Instead of keeping multiple acp_entries in lists, have a single
acp_entry per variable. With this, the implementation of clone is more
convenient and now fully implemented. In the previous code, clone was
only partial.

Before this patch, each acp_entry struct represented a write to a
variable including LHS, RHS and a mask of what channels were written
to. There were two main hash tables, the first (lhs_ht) stored a list
of acp_entries per LHS variable, with the values available to copy for
that variable; the second (rhs_ht) was a "reverse index" for the first
hash table, so stored acp_entries per RHS variable.

After the patch, there's a single acp_entry struct per LHS variable,
it contains an array with references to the RHS variables per
channel. There now is a single hash table, from LHS variable to the
corresponding entry. The "reverse index" is stored in the ACP entry,
in the form of a set of variables that copy from the LHS. To make the
clone operation cheaper, the ACP entries are created on demand.

This should not change the result of copy propagation, a later patch
will take advantage of the clone operation.

v2: Add note clarifying how the hashtable is destroyed.

v3: (all from Eric Anholt)
    Add remove_unused_var_from_dsts() function for reuse.
    Remove from dsts as we go instead of clearing at the end.
    Add clarifying comment to erase().

Reviewed-by: Eric Anholt <eric@anholt.net>
2018-07-19 10:00:30 -07:00
Caio Marcelo de Oliveira Filho
7b0d395250 glsl: separate copy propagation state
Separate higher level logic of visiting instructions and chosing when
to store and use new copy data from the datastructure holding the copy
propagation information. This will also make easier later patches that
change the structure.

v2: Remove empty destructor and clarify how hash tables are destroyed.

Reviewed-by: Eric Anholt <eric@anholt.net>
2018-07-19 10:00:30 -07:00
Caio Marcelo de Oliveira Filho
df8f1637fa glsl: remove unnecessary parenthesis from macro
The "__inst" will contain the name used for the variable of type
"__type *". Parenthesis is not necessary as the name itself shouldn't
be an expression.

Fixes warning:

In file included from ../../src/mesa/main/mtypes.h:49,
                 from ../../src/intel/compiler/brw_compiler.h:30,
                 from ../../src/intel/compiler/brw_shader.h:29,
                 from ../../src/intel/compiler/brw_fs.h:31,
                 from ../../src/intel/compiler/brw_fs_cse.cpp:24:
../../src/intel/compiler/brw_fs_cse.cpp: In member function ‘bool fs_visitor::opt_cse_local(bblock_t*)’:
../../src/compiler/glsl/list.h:675:12: warning: unnecessary parentheses in declaration of ‘entry’ [-Wparentheses]
    __type *(__inst);                                      \
            ^
../../src/intel/compiler/brw_fs_cse.cpp:257:10: note: in expansion of macro ‘foreach_in_list_use_after’
          foreach_in_list_use_after(aeb_entry, entry, &aeb) {
          ^~~~~~~~~~~~~~~~~~~~~~~~~

Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
2018-07-18 08:29:51 -07:00
Caio Marcelo de Oliveira Filho
ff8abce361 spirv: initialize is_vertex_input
Fixes warning:

../../src/compiler/spirv/vtn_variables.c: In function ‘var_decoration_cb’:
../../src/compiler/spirv/vtn_variables.c:1400:12: warning: ‘is_vertex_input’ may be used uninitialized in this function [-Wmaybe-uninitialized]
       bool is_vertex_input;
            ^~~~~~~~~~~~~~~

The code used to set is_vertex_input in all possible codepaths, but
after 23edc5b1ef "spirv: translate default-block uniforms" the
compiler isn't sure all codepaths will initialize the variable.

Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
2018-07-18 08:29:51 -07:00
Rob Clark
8dfc9e22c1 nir: add lowering for gl_HelperInvocation
v2: reword comment about lower_helper_invocations to be more clear
    that it might not work on all hardware
v3: add special variant of load_sample_id which does not imply per-
    sample shading

Signed-off-by: Rob Clark <robdclark@gmail.com>
2018-07-18 10:10:44 -04:00
Rob Clark
640b8eb5b1 nir: fixup intrinsic comment
Now the deref is the first src.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
2018-07-18 10:10:44 -04:00
Timothy Arceri
e105b0ca30 nir: add a couple of ior opts to nir_opt_algebraic
One of these was seen in a Deus Ex shader.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
2018-07-18 09:53:27 +10:00
Timothy Arceri
c4188a9b9f nir: allow opt_peephole_select to handle nir_instr_type_deref
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
2018-07-18 09:53:22 +10:00
Karol Herbst
71add09e79 nir/spirv: print id for unsupported alu opcode
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-17 13:24:09 +02:00
Karol Herbst
1beef89ad8 nir: prepare for bumping up max components to 16
OpenCL knows vector of size 8 and 16.

v2: rebased on master (nir_swizzle rework)
    rework more declarations with nir_component_mask_t
    adjust print_var_decl

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-17 13:24:09 +02:00
Caio Marcelo de Oliveira Filho
ba1b41b504 glsl: do second pass of const propagation in loops
When handling loops in constant propagation, implement the "FINISHME"
comment like copy propagation: perform a first pass to find values
that can't be propagated, then perform a second pass with the ACP
containing still valid values.

Certain values are killed because the loop may run more than one
iteration, so we can't copy propagate them as they would be invalid in
the later iterations.

Reviewed-by: Eric Anholt <eric@anholt.net>
2018-07-16 16:33:39 -07:00
Caio Marcelo de Oliveira Filho
d7849fd1da glsl: don't let an 'if' then-branch kill const propagation for else-branch
When handling 'if' in constant propagation, if a certain variable was
killed when processing the first branch of the 'if', then the second
would get any propagation from previous nodes. This is similar to the
change done for copy propagation code.

    x = 1;
    if (...) {
        z = x;  // This would turn into z = 1.
        x = 22; // x gets killed.
    } else {
        w = x;  // This would NOT turn into w = 1.
    }

With the change, we let constant propagation happen independently in
the two branches and only then apply the killed values for the
subsequent code.

The new code use a single hash table for keeping the kills of both
branches (the branches only write to it), and it gets deleted after we
use -- instead of waiting for mem_ctx to collect it.

NIR deals well with constant propagation, so it already covered for
the missing ones that this patch fixes.

Reviewed-by: Eric Anholt <eric@anholt.net>
2018-07-16 16:33:39 -07:00
Roland Scheidegger
b3474645d4 nir: fix msvc build
Empty initializer braces aren't valid c (it's a gnu extension, and
it's valid in c++).
Hopefully fixes appveyor / msvc build...

Fixes a3150c1d06
2018-07-16 20:07:53 +02:00
Jason Ekstrand
f378fa94b2 nir/worklist: Rework the foreach macro
This makes the arguments match the (thing, container) pattern used in
other nir_foreach macros and also renames it to make that a bit more
clear.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
2018-07-16 11:02:10 -07:00
Jason Ekstrand
5e030deaf2 spirv: Fix a couple of image atomic load/store bugs
For one thing, the NIR opcodes for image load/store always take and
return a vec4 value regardless of the image type.  We need to fix up
both the source and destination to handle it.  For another thing, we
weren't actually setting up a destination in the OpAtomicLoad case.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Cc: mesa-stable@lists.freedesktop.org
2018-07-16 10:54:50 -07:00
Karol Herbst
87c8af2836 nir: fix printing of vec16 type
Fixes: 2f181c8c18
       "glsl_types: vec8/vec16 support"

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-15 19:28:37 +02:00
Rob Clark
427a3dbdb1 nir/spirv: implement BuiltInWorkDim
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-15 07:51:13 +02:00
Karol Herbst
39180d3931 nir/spirv: print id for unsupported builtins
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-15 07:51:13 +02:00
Jason Ekstrand
a3150c1d06 nir/lower_tex: Use nir_format_srgb_to_linear
A while ago, we added a bunch of format conversion helpers; we should
use them instead of hand-rolling sRGB conversions.

Reviewed-by: Eric Anholt <eric@anholt.net>
2018-07-13 14:02:18 -07:00
Karol Herbst
cb65246ed2 nir: cleanup oversized arrays in nir_swizzle calls
There are no fixed sized array arguments in C, those are simply pointers
to unsized arrays and as the size is passed in anyway, just rely on that.

where possible calls are replaced by nir_channel and nir_channels.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-13 15:46:57 +02:00
Caio Marcelo de Oliveira Filho
1f6ce1973a nir: delete not needed for reinserted nir_cf_list
It wasn't causing problems since there's nothing to delete, but better
be consistent with the rest of existing codebase.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
2018-07-12 14:03:51 -07:00
Caio Marcelo de Oliveira Filho
13cfd6cc96 glsl: remove struct kill_entry in constant propagation
The only value in kill_entry is the writemask, which can be stored in
the data pointer of the hash table entry.

Suggested by Eric Anholt.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Thomas Helland <thomashelland90@gmail.com>
2018-07-12 14:03:51 -07:00
Caio Marcelo de Oliveira Filho
d6e869afe9 glsl: slim the kill_entry struct used in const propagation
Since 4654439fdd "glsl: Use hash tables for
opt_constant_propagation() kill sets." uses a hash_table for storing
kill_entries, so the structs can be simplified.

Remove the exec_node from kill_entry since it is not used in an
exec_list anymore.

Remove the 'var' from kill_entry since it is now redundant with the
key of the hash table.

Suggested by Eric Anholt.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Thomas Helland <thomashelland90@gmail.com>
2018-07-12 14:03:51 -07:00
Karol Herbst
686e140ce0 nir/spirv: handle OpConstantComposites with OpUndef members
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-12 13:09:00 +02:00
Karol Herbst
154ef32e46 nir/spirv: implement BuiltInGlobalSize
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-12 13:09:00 +02:00
Karol Herbst
31cbcbdb87 nir: move lowering of SYSTEM_VALUE_LOCAL_GROUP_SIZE into a function
we already have this code duplicated and we will need it for the global
group size as well

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-12 13:09:00 +02:00
Karol Herbst
529aa9e646 compiler: add missing entries to gl_system_value_name
also reorder to match the gl_system_value enum.

It is weird that the STATIC_ASSERT doesn't trigger though.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-12 13:09:00 +02:00
Rob Clark
d4280561f5 nir/spirv: print extension name in fail msg
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-12 13:09:00 +02:00
Rob Clark
9ce0360f76 nir/spirv: Use imov where we might have 8 bit types
Otherwise nir_validate may complain about 8 bit floats, which do not exist.

Reviewed-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
2018-07-12 13:09:00 +02:00
Neil Roberts
45106a1c93 spirv: Fix InterpolateAt* instructions for vecs with dynamic index
If the glsl is something like this:

  in vec4 some_input;
  interpolateAtCentroid(some_input[idx])

then it now gets generated as if it were:

  interpolateAtCentroid(some_input)[idx]

This is necessary because the index will get generated as a series of
nir_bcsel instructions so it would no longer be an input variable. It
is similar to what is done for GLSL in ca63a5ed3e.

Although I can’t find anything explicit in the Vulkan specs to say
this should be allowed, the SPIR-V spec just says “the operand
interpolant must be a pointer to the Input Storage Class”, which I
guess doesn’t rule out any type of pointer to an input.

This was found using the spec/glsl-4.40/execution/fs-interpolateAt*
Piglit tests with the ARB_gl_spirv branch.

Signed-off-by: Neil Roberts <nroberts@igalia.com>
Signed-off-by: Alejandro Piñeiro <apinheiro@igalia.com>

v2: update after nir_deref_instr land on master. Implemented by
    Alejandro Piñeiro. Special thanks to Jason Ekstrand for guidance
    at the new nir_deref_instr world.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
2018-07-10 11:43:40 +02:00
Jordan Justen
3a133223b3
compiler/blob: Add blob_skip_bytes
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
2018-07-09 23:02:33 -07:00
Jordan Justen
2a55553be3
mesa: Add disk shader cache driver blob callback
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
2018-07-09 23:02:28 -07:00
Jose Maria Casanova Crespo
0c01bf70e0 spirv/nir: Add support for SPV_KHR_8bit_storage
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
2018-07-10 00:14:50 +02:00
Jose Maria Casanova Crespo
f29c19cd5c spirv: Include headers and grammar for SPV_KHR_8bit_storage
Updates headers and grammar to ff684ffc6a35d2a58f0f63108877d0064ea33feb

Acked-by: Jason Ekstrand <jason@jlekstrand.net>
2018-07-10 00:14:50 +02:00
zhaowei yuan
73ec437627 glsl: Treat sampler2DRect and sampler2DRectShadow as reserved in ES2
"sampler2DRect" and "sampler2DRectShadow" are specified as
reserved from GLSL 1.1 and GLSL ES 1.0

Signed-off-by: zhaowei yuan <zhaowei.yuan@samsung.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106906
Reviewed-by: Eric Anholt <eric@anholt.net>
Fixes: 34f7e761bc ("glsl/parser: Track built-in types using the glsl_type directly")
2018-07-09 11:37:08 -07:00
Jason Ekstrand
6e88561156 nir/print: Print texture and sampler indices
Commit 5fb69daa6076e56b deleted support from nir_print for printing the
texture and sampler indices on texture instructions.  This commit just
brings it back as best as we can.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
2018-07-07 09:32:33 -07:00
Mathieu Bridon
0f7b18fa0d python: Use the print function
In Python 2, `print` was a statement, but it became a function in
Python 3.

Using print functions everywhere makes the script compatible with Python
versions >= 2.6, including Python 3.

Signed-off-by: Mathieu Bridon <bochecha@daitauha.fr>
Acked-by: Eric Engestrom <eric.engestrom@intel.com>
Acked-by: Dylan Baker <dylan@pnwbakers.com>
2018-07-06 10:04:22 -07:00
Eric Anholt
4b2ba18ff3 nir: Apply fragment color clamping to gl_FragData[] as well.
From the ARB_color_buffer_float spec:

   35. Should the clamping of fragment shader output gl_FragData[n]
       be controlled by the fragment color clamp.

       RESOLVED: Since the destination of the FragData is a color
       buffer, the fragment color clamp control should apply.

Fixes arb_color_buffer_float-mrt mixed on v3d.

Reviewed-by: Rob Clark <robdclark@gmail.com>
2018-07-05 12:39:36 -07:00
Mathieu Bridon
fe8a153648 python: Stabilize some script outputs
In Python, dictionaries and sets are unordered, and as a result their
is no guarantee that running this script twice will produce the same
output.

Using ordered dicts and explicitly sorting items makes the build more
reproducible, and will make it possible to verify that we're not
breaking anything when we move the build scripts to Python 3.

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
2018-07-05 12:52:12 +01:00
Roland Scheidegger
620626a371 nir/linker: fix msvc build
Empty initializer braces aren't valid c (it's a gnu extension, and
it's valid in c++).
Hopefully fixes appveyor / msvc build...

Fixes 6677e131b8
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
2018-07-05 09:27:05 +02:00