From: lkcl <lkcl@web>
Date: Wed, 4 May 2022 16:04:41 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~2477
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=18d7ed90f1c8396ec6494f4505c97c7306977ec3;p=libreriscv.git

---

diff --git a/openpower/sv/bitmanip.mdwn b/openpower/sv/bitmanip.mdwn
index 26f60956d..a2da88a75 100644
--- a/openpower/sv/bitmanip.mdwn
+++ b/openpower/sv/bitmanip.mdwn
@@ -467,6 +467,8 @@ uint64_t grevlut64(uint64_t RA, uint64_t RB, uint8 imm, bool iv)
 
 # grev
 
+superceded by grevlut
+
 based on RV bitmanip, this is also known as a butterfly network. however
 where a butterfly network allows setting of every crossbar setting in
 every row and every column, generalised-reverse (grev) only allows
@@ -497,6 +499,43 @@ uint64_t grev64(uint64_t RA, uint64_t RB)
 
 ```
 
+# gorc
+
+based on RV bitmanip, gorc is superceded by grevlut
+
+```
+uint32_t gorc32(uint32_t RA, uint32_t RB)
+{
+    uint32_t x = RA;
+    int shamt = RB & 31;
+    if (shamt & 1) x |= ((x & 0x55555555) << 1)   |  ((x &  0xAAAAAAAA) >> 1);
+    if (shamt & 2) x |= ((x & 0x33333333) << 2)   |  ((x &  0xCCCCCCCC) >> 2);
+    if (shamt & 4) x |= ((x & 0x0F0F0F0F) << 4)   |  ((x &  0xF0F0F0F0) >> 4);
+    if (shamt & 8) x |= ((x & 0x00FF00FF) << 8)   |  ((x &  0xFF00FF00) >> 8);
+    if (shamt & 16) x |= ((x & 0x0000FFFF) << 16) |  ((x &  0xFFFF0000) >> 16);
+    return x;
+}
+uint64_t gorc64(uint64_t RA, uint64_t RB)
+{
+    uint64_t x = RA;
+    int shamt = RB & 63;
+    if (shamt & 1) x |= ((x & 0x5555555555555555LL)   <<   1) |
+                         ((x & 0xAAAAAAAAAAAAAAAALL)  >>  1);
+    if (shamt & 2) x |= ((x & 0x3333333333333333LL)   <<   2) |
+                         ((x & 0xCCCCCCCCCCCCCCCCLL)  >>  2);
+    if (shamt & 4) x |= ((x & 0x0F0F0F0F0F0F0F0FLL)   <<   4) |
+                         ((x & 0xF0F0F0F0F0F0F0F0LL)  >>  4);
+    if (shamt & 8) x |= ((x & 0x00FF00FF00FF00FFLL)   <<   8) |
+                         ((x & 0xFF00FF00FF00FF00LL)  >>  8);
+    if (shamt & 16) x |= ((x & 0x0000FFFF0000FFFFLL)  << 16) |
+                         ((x & 0xFFFF0000FFFF0000LL)  >> 16);
+    if (shamt & 32) x |= ((x & 0x00000000FFFFFFFFLL)  << 32) |
+                         ((x & 0xFFFFFFFF00000000LL)  >> 32);
+    return x;
+}
+
+```
+
 # xperm
 
 based on RV bitmanip.
@@ -545,43 +584,6 @@ uint_xlen_t xperm_w (uint_xlen_t RA, uint_xlen_t RB)
 {  return xperm(RA, RB, 5); }
 ```
 
-# gorc
-
-based on RV bitmanip
-
-```
-uint32_t gorc32(uint32_t RA, uint32_t RB)
-{
-    uint32_t x = RA;
-    int shamt = RB & 31;
-    if (shamt & 1) x |= ((x & 0x55555555) << 1)   |  ((x &  0xAAAAAAAA) >> 1);
-    if (shamt & 2) x |= ((x & 0x33333333) << 2)   |  ((x &  0xCCCCCCCC) >> 2);
-    if (shamt & 4) x |= ((x & 0x0F0F0F0F) << 4)   |  ((x &  0xF0F0F0F0) >> 4);
-    if (shamt & 8) x |= ((x & 0x00FF00FF) << 8)   |  ((x &  0xFF00FF00) >> 8);
-    if (shamt & 16) x |= ((x & 0x0000FFFF) << 16) |  ((x &  0xFFFF0000) >> 16);
-    return x;
-}
-uint64_t gorc64(uint64_t RA, uint64_t RB)
-{
-    uint64_t x = RA;
-    int shamt = RB & 63;
-    if (shamt & 1) x |= ((x & 0x5555555555555555LL)   <<   1) |
-                         ((x & 0xAAAAAAAAAAAAAAAALL)  >>  1);
-    if (shamt & 2) x |= ((x & 0x3333333333333333LL)   <<   2) |
-                         ((x & 0xCCCCCCCCCCCCCCCCLL)  >>  2);
-    if (shamt & 4) x |= ((x & 0x0F0F0F0F0F0F0F0FLL)   <<   4) |
-                         ((x & 0xF0F0F0F0F0F0F0F0LL)  >>  4);
-    if (shamt & 8) x |= ((x & 0x00FF00FF00FF00FFLL)   <<   8) |
-                         ((x & 0xFF00FF00FF00FF00LL)  >>  8);
-    if (shamt & 16) x |= ((x & 0x0000FFFF0000FFFFLL)  << 16) |
-                         ((x & 0xFFFF0000FFFF0000LL)  >> 16);
-    if (shamt & 32) x |= ((x & 0x00000000FFFFFFFFLL)  << 32) |
-                         ((x & 0xFFFFFFFF00000000LL)  >> 32);
-    return x;
-}
-
-```
-
 # bitmatrix
 
 ```