diff --git a/include/ircd/gpt/vector.h b/include/ircd/gpt/vector.h
index fd97bf619..755ba95fd 100644
--- a/include/ircd/gpt/vector.h
+++ b/include/ircd/gpt/vector.h
@@ -11,22 +11,6 @@
 #pragma once
 #define HAVE_IRCD_GPT_VECTOR_H
 
-#if !defined(__SIZEOF_FLOAT4__) && defined(__OPENCL_VERSION__)
-	#define __SIZEOF_FLOAT4__ 16
-#endif
-
-#if !defined(__SIZEOF_FLOAT8__) && defined(__OPENCL_VERSION__)
-	#define __SIZEOF_FLOAT8__ 32
-#endif
-
-#if !defined(__SIZEOF_FLOAT16__) && defined(__OPENCL_VERSION__)
-	#define __SIZEOF_FLOAT16__ 64
-#endif
-
-#ifndef __OPENCL_VERSION__
-	#define __constant
-#endif
-
 static __constant const uint
 ircd_gpt_context_tokens = 512, // 1024,
 ircd_gpt_vector_elems = 768,
diff --git a/include/ircd/simt/assert.h b/include/ircd/simt/assert.h
new file mode 100644
index 000000000..223844933
--- /dev/null
+++ b/include/ircd/simt/assert.h
@@ -0,0 +1,31 @@
+// Matrix Construct
+//
+// Copyright (C) Matrix Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2022 Jason Volk <jason@zemos.net>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice is present in all copies. The
+// full license for this software is available in the LICENSE file.
+
+#pragma once
+#define HAVE_IRCD_SIMT_ASSERT_H
+
+//
+// Trapping assert() on supporting platforms.
+//
+
+#if defined(__OPENCL_VERSION__)
+	#if __OPENCL_VERSION__ >= 200 \
+	&& !defined(assert) \
+	&& !defined(NDEBUG) \
+	&& __has_builtin(__builtin_trap)
+		#define assert(expr)            \
+		({                              \
+			if(unlikely(!(bool)(x)))    \
+				__builtin_trap();       \
+		})
+	#else
+		#define assert(x)
+	#endif
+#endif
diff --git a/include/ircd/simt/portable.h b/include/ircd/simt/portable.h
new file mode 100644
index 000000000..9d17a68ab
--- /dev/null
+++ b/include/ircd/simt/portable.h
@@ -0,0 +1,79 @@
+// Matrix Construct
+//
+// Copyright (C) Matrix Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2022 Jason Volk <jason@zemos.net>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice is present in all copies. The
+// full license for this software is available in the LICENSE file.
+
+#pragma once
+#define HAVE_IRCD_SIMT_PORTABLE_H
+
+//
+// Decide the proper form of the restrict qualifier for the platform, if any.
+//
+
+#if defined(__OPENCL_VERSION__)
+	#if defined(__SPIR)
+		#define restrict
+	#elif defined(__cplusplus)
+		#define restrict __restrict
+	#endif
+#endif
+
+//
+// Decide the proper form of static linkage for the platform
+//
+
+#if defined(__OPENCL_VERSION__)
+	#if __OPENCL_VERSION__ < 120
+		#define static __attribute__((internal_linkage))
+	#elif __OPENCL_VERSION__ < 200
+		#define static __constant static
+	#endif
+#endif
+
+//
+// When headers are shared between opencl and non-opencl units, address space
+// qualifiers may be required for the former and can be ignored for the latter.
+// Note this header itself may be included by both opencl and non-opencl units.
+//
+
+#if !defined(__OPENCL_VERSION__)
+	#define __constant
+#endif
+
+//
+// Silently drop calls to printf() on unsupporting platforms; this way we can
+// leave the same code unmodified and quietly discard the output.
+//
+
+#if defined(__OPENCL_VERSION__)
+	#if __OPENCL_VERSION__ < 200
+		#define printf(...)
+	#endif
+#endif
+
+//
+// XXX
+//
+
+#if defined(__OPENCL_VERSION__)
+	#if !defined(__SIZEOF_FLOAT4__)
+		#define __SIZEOF_FLOAT4__ 16
+	#endif
+#endif
+
+#if defined(__OPENCL_VERSION__)
+	#if !defined(__SIZEOF_FLOAT8__)
+		#define __SIZEOF_FLOAT8__ 32
+	#endif
+#endif
+
+#if defined(__OPENCL_VERSION__)
+	#if !defined(__SIZEOF_FLOAT16__)
+		#define __SIZEOF_FLOAT16__ 64
+	#endif
+#endif
diff --git a/include/ircd/simt/simt.h b/include/ircd/simt/simt.h
index 8089919b7..1918d0f16 100644
--- a/include/ircd/simt/simt.h
+++ b/include/ircd/simt/simt.h
@@ -11,6 +11,8 @@
 #pragma once
 #define HAVE_IRCD_SIMT_H
 
+#include "portable.h"
+#include "assert.h"
 #include "broadcast.h"
 #include "reduce_add.h"
 #include "reduce_max.h"
diff --git a/ircd/gpt_gpu.cl b/ircd/gpt_gpu.cl
index feac4a04a..df811acae 100644
--- a/ircd/gpt_gpu.cl
+++ b/ircd/gpt_gpu.cl
@@ -15,46 +15,10 @@
 #include <ircd/config.h>
 #include <ircd/portable.h>
 #include <clc/clc.h>
-
-#if !defined(assert) \
-&& !defined(NDEBUG) \
-&& defined(RB_ASSERT_INTRINSIC) \
-&& __has_builtin(__builtin_trap) \
-&& __OPENCL_VERSION__ >= 200
-	#define assert(x) ((void)(unlikely(!(bool)(x))? __builtin_trap(): 0))
-#else
-	#define assert(x)
-#endif
-
-#if defined(__SPIR)
-	#define restrict
-#elif defined(__cplusplus)
-	#define restrict __restrict
-#endif
-
-#if __OPENCL_VERSION__ < 120
-	#define static __attribute__((internal_linkage))
-#elif __OPENCL_VERSION__ < 200
-	#define static __constant static
-#endif
-
-#if __OPENCL_VERSION__ < 200
-	#define printf(...)
-#endif
-
-#pragma clang attribute push(__attribute__((always_inline)), apply_to = function)
-#pragma clang attribute push(__attribute__((internal_linkage)), apply_to = function)
 #include <ircd/simt/simt.h>
 #include <ircd/gpt/vector.h>
 #include <ircd/gpt/opts.h>
 #include <ircd/gpt/ctrl.h>
-#pragma clang attribute pop
-#pragma clang attribute pop
-
-#if __OPENCL_VERSION__ >= 120
-	#undef static
-#endif
-
 #include <ircd/gpt/gpu.h>
 
 //