symm/gcm-arm64-pmull.S (mul192): Fix commentary.

diff --git a/symm/gcm-arm64-pmull.S b/symm/gcm-arm64-pmull.S
index 0e4bd79..4935e46 100644 (file)
--- a/symm/gcm-arm64-pmull.S
+++ b/symm/gcm-arm64-pmull.S
@@ -272,7 +272,7 @@
        vshr128 v23, v20, 64            // (0; d_1)
        eor     v16.16b, v16.16b, v21.16b // (x_1; x_0)
        eor     v17.16b, v17.16b, v22.16b // (x_3; x_2)
-       eor     v18.16b, v18.16b, v23.16b // (x_3; x_2)
+       eor     v18.16b, v18.16b, v23.16b // (x_5; x_4)
 
        // Next, the reduction.  Our polynomial this time is p(x) = t^192 +
        // t^7 + t^2 + t + 1.  Yes, the magic numbers are the same as the