From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 29 Aug 2022 11:13:34 +0000 (+0100)
Subject: add logging into ISACaller.handle_overflow to see what gets set
X-Git-Tag: sv_maxu_works-initial~69
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f05552305c24586fc0ddf25a993a0cf290831624;p=openpower-isa.git

add logging into ISACaller.handle_overflow to see what gets set
---

diff --git a/src/openpower/decoder/isa/caller.py b/src/openpower/decoder/isa/caller.py
index 9ce3b11f..03db3ff7 100644
--- a/src/openpower/decoder/isa/caller.py
+++ b/src/openpower/decoder/isa/caller.py
@@ -930,11 +930,13 @@ class ISACaller(ISACallerHelper, ISAFPHelpers):
             ov32 = 1 if input32_sgn[0] == input32_sgn[1] and \
                 output32_sgn != input32_sgn[0] else 0
 
+        # now update XER OV/OV32/SO
+        so = self.spr['XER'][XER_bits['SO']]
+        new_so = so | ov # sticky overflow ORs in old with new
         self.spr['XER'][XER_bits['OV']] = ov
         self.spr['XER'][XER_bits['OV32']] = ov32
-        so = self.spr['XER'][XER_bits['SO']]
-        so = so | ov
-        self.spr['XER'][XER_bits['SO']] = so
+        self.spr['XER'][XER_bits['SO']] = new_so
+        log("    set overflow", ov, ov32, so, new_so)
 
     def handle_comparison(self, outputs, cr_idx=0, overflow=None, no_so=False):
         out = outputs[0]