assembler.fs: add support for omod

regs/assembler/fs/alu_emitter.py

@@ -17,6 +17,9 @@ def emit_alpha_op(code, alpha_op):
     if alpha_op.dest.omask is not None:
         US_CMN_INST.ALPHA_OMASK(code, alpha_op.dest.omask.value)
 
+    # omod
+    US_ALU_ALPHA_INST.OMOD(code, alpha_op.omod.value)
+
     # opcode
     US_ALU_ALPHA_INST.ALPHA_OP(code, alpha_op.opcode.value)
 
@@ -59,6 +62,9 @@ def emit_rgb_op(code, rgb_op):
     if rgb_op.dest.omask is not None:
         US_CMN_INST.RGB_OMASK(code, rgb_op.dest.omask.value)
 
+    # omod
+    US_ALU_RGB_INST.OMOD(code, rgb_op.omod.value)
+
     # opcode
     US_ALU_RGBA_INST.RGB_OP(code, rgb_op.opcode.value)
 

regs/assembler/fs/alu_validator.py

@@ -110,6 +110,26 @@ class Swizzle(IntEnum):
     one = 6
     unused = 7
 
+class Omod(IntEnum):
+    mul_1 = 0
+    mul_2 = 1
+    mul_4 = 2
+    mul_8 = 3
+    div_2 = 4
+    div_4 = 5
+    div_8 = 6
+    disable = 7
+
+omod_lexemes = OrderedDict([
+    ((b"1", b"0"), Omod.mul_1),
+    ((b"2", b"0"), Omod.mul_2),
+    ((b"4", b"0"), Omod.mul_4),
+    ((b"8", b"0"), Omod.mul_8),
+    ((b"0", b"5"), Omod.div_2),
+    ((b"0", b"25"), Omod.div_4),
+    ((b"0", b"125"), Omod.div_8),
+])
+
 @dataclass
 class SwizzleSel:
     src: SwizzleSelSrc
@@ -119,12 +139,14 @@ class SwizzleSel:
 @dataclass
 class AlphaOperation:
     dest: AlphaDest
+    omod: Omod
     opcode: AlphaOp
     sels: list[SwizzleSel]
 
 @dataclass
 class RGBOperation:
     dest: RGBDest
+    omod: Omod
     opcode: RGBOp
     sels: list[SwizzleSel]
 
@@ -413,14 +435,27 @@ def validate_instruction_operation_sels(swizzle_sels, is_alpha):
         sels.append(SwizzleSel(src, swizzle, mod))
     return sels
 
+def validate_omod_operation(operation):
+    omod = Omod.mul_1
+    if operation.omod != None:
+        integer, decimal = operation.omod
+        key = (integer.lexeme, decimal.lexeme)
+        if key not in omod_lexemes:
+            valid_omods = b", ".join(b".".join(key) for key in omod_lexemes.keys()).decode('utf-8')
+            raise ValidatorError(f"invalid omod, expected one of [{valid_omods}]", integer)
+        omod = omod_lexemes[key]
+    return omod
+
 def validate_alpha_instruction_operation(operation):
     dest = validate_instruction_operation_dest(operation.dest_addr_swizzles,
                                                mask_lookup=alpha_masks,
                                                type_cls=AlphaDest)
+    omod = validate_omod_operation(operation)
     opcode = alpha_op_kws[operation.opcode_keyword.keyword]
     sels = validate_instruction_operation_sels(operation.swizzle_sels, is_alpha=True)
     return AlphaOperation(
         dest,
+        omod,
         opcode,
         sels
     )
@@ -429,10 +464,12 @@ def validate_rgb_instruction_operation(operation):
     dest = validate_instruction_operation_dest(operation.dest_addr_swizzles,
                                                mask_lookup=rgb_masks,
                                                type_cls=RGBDest)
+    omod = validate_omod_operation(operation)
     opcode = rgb_op_kws[operation.opcode_keyword.keyword]
     sels = validate_instruction_operation_sels(operation.swizzle_sels, is_alpha=False)
     return RGBOperation(
         dest,
+        omod,
         opcode,
         sels
     )

regs/assembler/fs/parser.py

@@ -35,6 +35,7 @@ class ALUSwizzleSel:
 @dataclass
 class ALUOperation:
     dest_addr_swizzles: list[DestAddrSwizzle]
+    omod: tuple[Token, Token]
     opcode_keyword: Token
     swizzle_sels: list[ALUSwizzleSel]
 
@@ -115,6 +116,15 @@ class Parser(BaseParser):
             return token.keyword in opcode_keywords
         return False
 
+    def alu_is_omod(self):
+        is_omod = (
+            self.match(TT.identifier, offset=0)
+            and self.match(TT.dot, offset=1)
+            and self.match(TT.identifier, offset=2)
+            and self.match(TT.star, offset=3)
+        )
+        return is_omod
+
     def alu_is_neg(self):
         result = self.match(TT.minus)
         if result:
@@ -154,9 +164,17 @@ class Parser(BaseParser):
 
     def alu_operation(self):
         dest_addr_swizzles = []
-        while not self.alu_is_opcode():
+        while not (self.alu_is_opcode() or self.alu_is_omod()):
             dest_addr_swizzles.append(self.dest_addr_swizzle())
 
+        omod = None
+        if self.alu_is_omod():
+            omod_integer = self.consume(TT.identifier, "expected omod decimal identifier")
+            self.consume(TT.dot, "expected omod decimal dot")
+            omod_decimal = self.consume(TT.identifier, "expected omod decimal identifier")
+            self.consume(TT.star, "expected omod star")
+            omod = (omod_integer, omod_decimal)
+
         opcode_keyword = self.consume(TT.keyword, "expected opcode keyword")
 
         swizzle_sels = []
@@ -165,6 +183,7 @@ class Parser(BaseParser):
 
         return ALUOperation(
             dest_addr_swizzles,
+            omod,
             opcode_keyword,
             swizzle_sels
         )

regs/assembler/lexer.py

@@ -21,6 +21,7 @@ class TT(Enum):
     bar = auto()
     comma = auto()
     minus = auto()
+    star = auto()
 
 @dataclass
 class Token:
@@ -112,6 +113,8 @@ class Lexer:
                 return Token(*self.pos(), TT.semicolon, self.lexeme())
             elif c == ord(','):
                 return Token(*self.pos(), TT.comma, self.lexeme())
+            elif c == ord('*'):
+                return Token(*self.pos(), TT.star, self.lexeme())
             elif c == ord('-') and self.peek() == ord('-'):
                 self.advance()
                 while not self.at_end_p() and self.peek() != ord('\n'):

regs/assembler/parser.py

@@ -22,8 +22,8 @@ class BaseParser:
         self.current_ix += 1
         return token
 
-    def match(self, token_type):
+    def match(self, token_type, offset=0):
-        token = self.peek()
+        token = self.peek(offset)
         return token.type == token_type
 
     def match_keyword(self, keyword):