From: lkcl <lkcl@web>
Date: Wed, 8 Sep 2021 11:40:10 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: DRAFT_SVP64_0_1~183
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2be07152078ced7c353ffb1e8eaf375018d0ae62;p=libreriscv.git

---

diff --git a/openpower/sv/cr_ops.mdwn b/openpower/sv/cr_ops.mdwn
index b6540eb84..52400de00 100644
--- a/openpower/sv/cr_ops.mdwn
+++ b/openpower/sv/cr_ops.mdwn
@@ -118,17 +118,29 @@ test the co-resultant CR when Rc=1.
     for i in range(VL):
         # predication test, skip all masked out elements.
         # skips when sz=0
-        if predicate_masked_out(i):
+        if sz=0 and predicate_masked_out(i):
              continue
-        # result is to go into CR. may be a 4-bit CR Field
-        # (3-bit mode) or just a single bit (5-bit mode)
-        result = op(...)
-        # obtain CRbit from BA result operand field,
-        # if this CR op has 5-bit CR result operands
+        if predicate_masked_out(i):
+           if 5bit mode:
+              # only one bit of CR to update
+              result = SNZ
+           else
+              # four copies of SNZ
+              result = SNZ || SNZ || SNZ || SNZ
+        else
+           # result is to go into CR. may be a 4-bit CR Field
+           # (3-bit mode) or just a single bit (5-bit mode)
+           result = op(...)
         if 5bit mode:
-           CRbit = BA[3:4] 
+           # if this CR op has 5-bit CR result operands
+           # the single bit result is what must be tested
+           to_test = result
+        else
+           # if however this is a 3-bit CR *field* result
+           # then the bit to be tested must be selected
+           to_test = result[CRbit]
         # now test CR, similar to branch
-        if CRnew[CRbit] != inv:
+        if to_test != inv:
             continue # test failed: cancel store
         # result optionally stored
         update_CR(result)