From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Tue, 19 May 2020 20:58:13 +0000 (+0100)
Subject: remove SPR3 from Branch Data, rename lr and spr to SPR1 and SPR2
X-Git-Tag: div_pipeline~1060
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e4907f4b9dd32595fe43c9a5714f42db2e7922d8;p=soc.git

remove SPR3 from Branch Data, rename lr and spr to SPR1 and SPR2
---

diff --git a/src/soc/fu/branch/pipe_data.py b/src/soc/fu/branch/pipe_data.py
index 43852e05..2772236e 100644
--- a/src/soc/fu/branch/pipe_data.py
+++ b/src/soc/fu/branch/pipe_data.py
@@ -3,30 +3,24 @@
     (CompBROpSubset, CIA) not included.
 
     * CR is Condition Register (not an SPR)
-    * SPR1, SPR2 and SPR3 are all from the SPR regfile.  3 ports are needed
+    * SPR1 and SPR2 are all from the SPR regfile.  2 ports are needed
 
-    insn       CR  SPR1  SPR2    SPR3
-    ----       --  ----  ----    ----
-    op_b       xx  xx     xx     xx
-    op_ba      xx  xx     xx     xx
-    op_bl      xx  xx     xx     xx
-    op_bla     xx  xx     xx     xx
-    op_bc      CR, xx,    CTR    xx
-    op_bca     CR, xx,    CTR    xx
-    op_bcl     CR, xx,    CTR    xx
-    op_bcla    CR, xx,    CTR    xx
-    op_bclr    CR, LR,    CTR    xx
-    op_bclrl   CR, LR,    CTR    xx
-    op_bcctr   CR, xx,    CTR    xx
-    op_bcctrl  CR, xx,    CTR    xx
-    op_bctar   CR, TAR,   CTR,   xx
-    op_bctarl  CR, TAR,   CTR,   xx
-
-    op_sc      xx  xx     xx     MSR
-    op_scv     xx  LR,    SRR1,  MSR
-    op_rfscv   xx  LR,    CTR,   MSR
-    op_rfid    xx  SRR0,  SRR1,  MSR
-    op_hrfid   xx  HSRR0, HSRR1, MSR
+    insn       CR  SPR1  SPR2
+    ----       --  ----  ----
+    op_b       xx  xx     xx
+    op_ba      xx  xx     xx
+    op_bl      xx  xx     xx
+    op_bla     xx  xx     xx
+    op_bc      CR, xx,    CTR
+    op_bca     CR, xx,    CTR
+    op_bcl     CR, xx,    CTR
+    op_bcla    CR, xx,    CTR
+    op_bclr    CR, LR,    CTR
+    op_bclrl   CR, LR,    CTR
+    op_bcctr   CR, xx,    CTR
+    op_bcctrl  CR, xx,    CTR
+    op_bctar   CR, TAR,   CTR
+    op_bctarl  CR, TAR,   CTR
 """
 
 from nmigen import Signal, Const
@@ -44,47 +38,44 @@ class BranchInputData(IntegerData):
 
         self.spr1 = Signal(64, reset_less=True) # see table above, SPR1
         self.spr2 = Signal(64, reset_less=True) # see table above, SPR2
-        self.spr3 = Signal(64, reset_less=True) # see table above, SPR3
         self.cr = Signal(32, reset_less=True)   # Condition Register(s) CR0-7
         self.cia = Signal(64, reset_less=True)  # Current Instruction Address
 
         # convenience variables.  not all of these are used at once
         self.ctr = self.srr0 = self.hsrr0 = self.spr2
         self.lr = self.tar = self.srr1 = self.hsrr1 = self.spr1
-        self.msr = self.spr3
 
     def __iter__(self):
         yield from super().__iter__()
         yield self.spr1
         yield self.spr2
-        yield self.spr3
         yield self.cr
         yield self.cia
 
     def eq(self, i):
         lst = super().eq(i)
         return lst + [self.spr1.eq(i.spr1), self.spr2.eq(i.spr2),
-                      self.spr3.eq(i.spr3),
                       self.cr.eq(i.cr), self.cia.eq(i.cia)]
 
 
 class BranchOutputData(IntegerData):
     def __init__(self, pspec):
         super().__init__(pspec)
-        self.lr = Data(64, name="lr")
-        self.spr = Data(64, name="spr")
+        self.spr1 = Data(64, name="spr1")
+        self.spr2 = Data(64, name="spr2")
         self.nia = Data(64, name="nia")
 
         # convenience variables.
-        self.ctr = self.spr
+        self.lr = self.tar = self.spr1
+        self.ctr = self.spr2
 
     def __iter__(self):
         yield from super().__iter__()
-        yield from self.lr
-        yield from self.spr
+        yield from self.spr1
+        yield from self.spr2
         yield from self.nia
 
     def eq(self, i):
         lst = super().eq(i)
-        return lst + [self.lr.eq(i.lr), self.spr.eq(i.spr),
+        return lst + [self.spr1.eq(i.spr1), self.spr2.eq(i.spr2),
                       self.nia.eq(i.nia)]