From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 5 Jul 2021 17:33:17 +0000 (+0100)
Subject: add last_op_svshape flag to ISACaller
X-Git-Tag: xlen-bcd~348
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9325c7113e9a5036d41e95165b17b3cddcae693e;p=openpower-isa.git

add last_op_svshape flag to ISACaller
---

diff --git a/src/openpower/decoder/isa/caller.py b/src/openpower/decoder/isa/caller.py
index 06abbf28..fb17a1f2 100644
--- a/src/openpower/decoder/isa/caller.py
+++ b/src/openpower/decoder/isa/caller.py
@@ -588,10 +588,17 @@ class ISACaller:
         self.gpr = GPR(decoder2, self, self.svstate, regfile)
         self.fpr = GPR(decoder2, self, self.svstate, fpregfile)
         self.spr = SPR(decoder2, initial_sprs) # initialise SPRs before MMU
+
+        # set up 4 dummy SVSHAPEs if they aren't already set up
         for i in range(4):
             sname = 'SVSHAPE%d' % i
             if sname not in self.spr:
                 self.spr[sname] = SVSHAPE(0)
+            else:
+                # make sure it's an SVSHAPE
+                val = self.spr[sname].value
+                self.spr[sname] = SVSHAPE(val)
+        self.last_op_svshape = False
 
         # "raw" memory
         self.mem = Mem(row_bytes=8, initial_mem=initial_mem)
@@ -1437,6 +1444,13 @@ class ISACaller:
             # reset loop to zero
             self.svp64_reset_loop()
 
+        # XXX only in non-SVP64 mode!
+        # record state of whether the current operation was an svshape,
+        # to be able to know if it should apply in the next instruction.
+        # also (if going to use this instruction) should disable ability
+        # to interrupt in between. sigh.
+        self.last_op_svshape = name == 'svshape'
+
         self.update_pc_next()
 
     def update_pc_next(self):