diff --git a/.clang-format b/.clang-format
index 0194e0d..fca6e0e 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,3 +1,6 @@
 BasedOnStyle: LLVM
 PointerAlignment: Left
 ReflowComments: false
+
+MacroBlockBegin: "^OPER_PHASE_."
+MacroBlockEnd: "^OPER_END"
diff --git a/sim.c b/sim.c
index b2de700..1fc2cbd 100644
--- a/sim.c
+++ b/sim.c
@@ -71,39 +71,55 @@ oper_move_relative_or_explode(Field_buffer field_buffer, Markmap_buffer markmap,
   field_buffer[y * field_width + x] = '.';
 }
 
-static inline void oper_phase2_a(Field* field, Markmap_buffer markmap, Usz y,
-                                 Usz x) {
-  (void)markmap;
-  Glyph inp0 = field_peek_relative(field, y, x, 0, 1);
-  Glyph inp1 = field_peek_relative(field, y, x, 0, 2);
+#define OPER_PHASE_N(_phase_number, _oper_name)                                \
+  static inline void oper_phase##_phase_number##_##_oper_name(                 \
+      Field* field, Markmap_buffer markmap, Usz y, Usz x) {                    \
+    (void)field;                                                               \
+    (void)markmap;                                                             \
+    (void)y;                                                                   \
+    (void)x;
+
+#define OPER_PHASE_0(_oper_name) OPER_PHASE_N(0, _oper_name)
+#define OPER_PHASE_1(_oper_name) OPER_PHASE_N(1, _oper_name)
+#define OPER_PHASE_2(_oper_name) OPER_PHASE_N(2, _oper_name)
+#define OPER_END }
+
+#define OPER_PEEK_RELATIVE(_delta_y, _delta_x)                                 \
+  field_peek_relative(field, y, x, _delta_y, _delta_x)
+#define OPER_POKE_RELATIVE(_delta_y, _delta_x, _glyph)                         \
+  field_poke_relative(field, y, x, _delta_x, _delta_y, _glyph)
+#define OPER_POKE_ABSOLUTE(_y, _x, _glyph) field_poke(field, _y, _x, _glyph)
+
+#define OPER_MOVE_OR_EXPLODE(_delta_y, _delta_x)                               \
+  oper_move_relative_or_explode(field->buffer, markmap, field->height,         \
+                                field->width, 'E', y, x, 0, 1);
+
+OPER_PHASE_2(a)
+  Glyph inp0 = OPER_PEEK_RELATIVE(0, 1);
+  Glyph inp1 = OPER_PEEK_RELATIVE(0, 2);
   if (inp0 != '.' && inp1 != '.') {
     Glyph g = glyphs_sum(inp0, inp1);
     field_poke_relative(field, y, x, 1, 0, g);
   }
-}
+OPER_END
 
-static inline void oper_phase1_E(Field* field, Markmap_buffer markmap, Usz y,
-                                 Usz x) {
+OPER_PHASE_1(E)
   oper_move_relative_or_explode(field->buffer, markmap, field->height,
                                 field->width, 'E', y, x, 0, 1);
-}
+OPER_END
 
-static inline void oper_phase2_m(Field* field, Markmap_buffer markmap, Usz y,
-                                 Usz x) {
-  (void)markmap;
-  Glyph inp0 = field_peek_relative(field, y, x, 0, 1);
-  Glyph inp1 = field_peek_relative(field, y, x, 0, 2);
+OPER_PHASE_2(m)
+  Glyph inp0 = OPER_PEEK_RELATIVE(0, 1);
+  Glyph inp1 = OPER_PEEK_RELATIVE(0, 2);
   if (inp0 != '.' && inp1 != '.') {
     Glyph g = glyphs_mod(inp0, inp1);
-    field_poke_relative(field, y, x, 1, 0, g);
+    OPER_POKE_RELATIVE(1, 0, g);
   }
-}
+OPER_END
 
-static inline void oper_phase1_star(Field* field, Markmap_buffer markmap, Usz y,
-                                    Usz x) {
-  (void)markmap;
-  field_poke(field, y, x, '.');
-}
+OPER_PHASE_1(star)
+  OPER_POKE_ABSOLUTE(y, x, '.');
+OPER_END
 
 void orca_run(Field* field, Markmap_buffer markmap) {
   Usz ny = field->height;