move mul data struct to separate module

[ieee754fpu.git] / src / ieee754 / fpmul / datastructs.py

diff --git a/src/ieee754/fpmul/datastructs.py b/src/ieee754/fpmul/datastructs.py
new file mode 100644 (file)
index 0000000..26914e5
--- /dev/null
+++ b/src/ieee754/fpmul/datastructs.py
@@ -0,0 +1,28 @@
+"""IEEE754 Floating Point Multiplier Pipeline
+
+Copyright (C) 2019 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
+
+"""
+
+from nmigen import Signal
+
+from ieee754.fpcommon.fpbase import FPNumBaseRecord
+from ieee754.fpcommon.getop import FPPipeContext
+
+
+class FPMulStage0Data:
+
+    def __init__(self, pspec):
+        width = pspec.width
+        self.z = FPNumBaseRecord(width, False)
+        self.out_do_z = Signal(reset_less=True)
+        self.oz = Signal(width, reset_less=True)
+        mw = (self.z.m_width)*2 - 1 + 3 # sticky/round/guard bits + (2*mant) - 1
+        self.product = Signal(mw, reset_less=True)
+        self.ctx = FPPipeContext(pspec)
+        self.muxid = self.ctx.muxid
+
+    def eq(self, i):
+        return [self.z.eq(i.z), self.out_do_z.eq(i.out_do_z), self.oz.eq(i.oz),
+                self.product.eq(i.product), self.ctx.eq(i.ctx)]
+