optimize keccak_chi

23a572b6 · George Hotz · b35c76dd · 23a572b6
Commit 23a572b6 authored Oct 13, 2021 by George Hotz
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Showing with 10 additions and 4 deletions

Lib_Keccak256.sol contracts/lib/Lib_Keccak256.sol +10 -4

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--- a/contracts/lib/Lib_Keccak256.sol
+++ b/contracts/lib/Lib_Keccak256.sol
@@ -69,13 +69,19 @@ library Lib_Keccak256 {
    uint i;
    uint64 A0;
    uint64 A1;
+    uint64 A2;
+    uint64 A3;
+    uint64 A4;
    for (i = 0; i < 25; i+=5) {
      A0 = c.A[0 + i];
      A1 = c.A[1 + i];
-      c.A[0 + i] ^= ~A1 & c.A[2 + i];
-      c.A[1 + i] ^= ~c.A[2 + i] & c.A[3 + i];
-      c.A[2 + i] ^= ~c.A[3 + i] & c.A[4 + i];
-      c.A[3 + i] ^= ~c.A[4 + i] & A0;
+      A2 = c.A[2 + i];
+      A3 = c.A[3 + i];
+      A4 = c.A[4 + i];
+      c.A[0 + i] ^= ~A1 & A2;
+      c.A[1 + i] ^= ~A2 & A3;
+      c.A[2 + i] ^= ~A3 & A4;
+      c.A[3 + i] ^= ~A4 & A0;
      c.A[4 + i] ^= ~A0 & A1;
    }
  }