diff --git a/src/spur32.cog.lowcode/vmCallback.h b/src/spur32.cog.lowcode/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur32.cog.lowcode/vmCallback.h
+++ b/src/spur32.cog.lowcode/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur32.cog/vmCallback.h b/src/spur32.cog/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur32.cog/vmCallback.h
+++ b/src/spur32.cog/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur32.sista/vmCallback.h b/src/spur32.sista/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur32.sista/vmCallback.h
+++ b/src/spur32.sista/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur32.stack.lowcode/vmCallback.h b/src/spur32.stack.lowcode/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur32.stack.lowcode/vmCallback.h
+++ b/src/spur32.stack.lowcode/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur32.stack/vmCallback.h b/src/spur32.stack/vmCallback.h
index afa919ab63..d1d6d7d5c0 100644
--- a/src/spur32.stack/vmCallback.h
+++ b/src/spur32.stack/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-mt.3362 uuid: b8f74e14-6430-924d-93fb-2fc1cd50ba34
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur64.cog.lowcode/vmCallback.h b/src/spur64.cog.lowcode/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur64.cog.lowcode/vmCallback.h
+++ b/src/spur64.cog.lowcode/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur64.cog/vmCallback.h b/src/spur64.cog/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur64.cog/vmCallback.h
+++ b/src/spur64.cog/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur64.sista/vmCallback.h b/src/spur64.sista/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur64.sista/vmCallback.h
+++ b/src/spur64.sista/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur64.stack.lowcode/vmCallback.h b/src/spur64.stack.lowcode/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur64.stack.lowcode/vmCallback.h
+++ b/src/spur64.stack.lowcode/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/spur64.stack/vmCallback.h b/src/spur64.stack/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/spur64.stack/vmCallback.h
+++ b/src/spur64.stack/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/v3.cog/vmCallback.h b/src/v3.cog/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/v3.cog/vmCallback.h
+++ b/src/v3.cog/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8
 
 
diff --git a/src/v3.stack/vmCallback.h b/src/v3.stack/vmCallback.h
index ef623af1c1..d1d6d7d5c0 100644
--- a/src/v3.stack/vmCallback.h
+++ b/src/v3.stack/vmCallback.h
@@ -1,5 +1,6 @@
 /* Automatically generated by
-	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3150 uuid: 832f44e4-6d22-4545-ae94-d8453b49d54f
+	CCodeGeneratorGlobalStructure VMMaker.oscog-eem.3475 uuid: 8b989602-3968-4b65-a727-59288aa8ebcf
+	(Compiler-eem.512)
  */
 
 #define VM_CALLBACK_INC 1
@@ -12,21 +13,29 @@ typedef struct _VMCallbackContext {
 	void *savedCStackPointer;
 	void *savedCFramePointer;
 	union {
-								sqIntptr_t valword;
-								struct { int low, high; } valleint64;
-								struct { int high, low; } valbeint64;
-								double valflt64;
-								struct { void *addr; sqIntptr_t size; } valstruct;
-							}rvs;
+		sqIntptr_t valword;
+		struct { int low, high; } valleint64;
+		struct { int high, low; } valbeint64;
+		double valflt64;
+		struct { void *addr; sqIntptr_t size; } valstruct;
+		struct { sqIntptr_t a; sqIntptr_t b; } valstructll; // x86_64 Sys V ABI value struct register return types
+		struct { sqIntptr_t a; double b; } valstructld;
+		struct { double a; sqIntptr_t b; } valstructdl;
+		struct { double a; double b; } valstructdd;
+	}rvs;
 	void *savedMostRecentCallbackContext;
 	jmp_buf	trampoline;
 	jmp_buf	savedReenterInterpreter;
  } VMCallbackContext;
 
-/* The callback return type codes */
+// The callback return type codes
 #define retword 1
 #define retword64 2
 #define retdouble 3
 #define retstruct 4
+#define retstructll 5
+#define retstructld 6
+#define retstructdl 7
+#define retstructdd 8