From: lkcl <lkcl@web>
Date: Thu, 28 Jan 2021 17:18:53 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~269
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3f52776c812ccf64306422404cf483a13302ce9e;p=libreriscv.git

---

diff --git a/openpower/sv/bitmanip.mdwn b/openpower/sv/bitmanip.mdwn
index 7a6bf065a..87c0153d6 100644
--- a/openpower/sv/bitmanip.mdwn
+++ b/openpower/sv/bitmanip.mdwn
@@ -20,8 +20,6 @@ minor opcode allocation
 | dest | src1 | subop | op       |
 | ---- | ---- | ----- | -------- |
 | RT   | RA   | ..    | bmatflip | 
-| RT   | RA   | size  | crc32    | 
-| RT   | RA   | size  | crc32c   | 
 
 2-op and variants
 
@@ -553,36 +551,6 @@ def gf_invert(a, mod=0x1B) :
   return g1
 ```
 
-# crc
-
-* <https://stackoverflow.com/questions/21171733/calculating-constants-for-crc32-using-pclmulqdq>
-* <https://en.wikipedia.org/wiki/Cyclic_redundancy_check>
-
-```
-uint_xlen_t crc32(uint_xlen_t x, int nbits)
-{
-    for (int i = 0; i < nbits; i++)
-        x = (x >> 1) ^ (0xEDB88320 & ~((x&1)-1));
-    return x;
-}
-uint_xlen_t crc32c(uint_xlen_t x, int nbits)
-{
-    for (int i = 0; i < nbits; i++)
-        x = (x >> 1) ^ (0x82F63B78 & ~((x&1)-1));
-    return x;
-}
-uint_xlen_t crc32_b(uint_xlen_t RA) { return crc32(RA, 8); }
-uint_xlen_t crc32_h(uint_xlen_t RA) { return crc32(RA, 16); }
-uint_xlen_t crc32_w(uint_xlen_t RA) { return crc32(RA, 32); }
-uint_xlen_t crc32c_b(uint_xlen_t RA) { return crc32c(RA, 8); }
-uint_xlen_t crc32c_h(uint_xlen_t RA) { return crc32c(RA, 16); }
-uint_xlen_t crc32c_w(uint_xlen_t RA) { return crc32c(RA, 32); }
-#if XLEN > 32
-uint_xlen_t crc32_d (uint_xlen_t RA) { return crc32 (RA, 64); }
-uint_xlen_t crc32c_d(uint_xlen_t RA) { return crc32c(RA, 64); }
-#endif
-```
-
 # bitmatrix
 
 ```