From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 19 Mar 2021 23:40:38 +0000 (+0000)
Subject: more comments for TestIssuer when adding predication
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a4e42937cb0545d6ace1e03e70ba801b34d749de;p=soc.git

more comments for TestIssuer when adding predication
---

diff --git a/src/soc/simple/issuer.py b/src/soc/simple/issuer.py
index 805940c7..2d02ea1a 100644
--- a/src/soc/simple/issuer.py
+++ b/src/soc/simple/issuer.py
@@ -469,6 +469,9 @@ class TestIssuerInternal(Elaboratable):
                 #    from self.srcmask and self.dstmask
                 #    https://bugs.libre-soc.org/show_bug.cgi?id=617#c3
                 #    but still without exceeding VL in either case
+                # IMPORTANT: when changing src/dest step, have to
+                # jump to m.next = "DECODE_SV" to deal with the change in
+                # SVSTATE
                 comb += exec_insn_valid_i.eq(1) # trigger execute
                 with m.If(exec_insn_ready_o):   # execute acknowledged us
                     m.next = "EXECUTE_WAIT"