# HG changeset patch
# User Paper <paper@tflc.us>
# Date 1732509802 0
# Node ID 6c91cd9a2f2dd52a3ccfd66f019a4b160840cb9c
# Parent  92156fe3275589671ac127ecffe9220c3c78b2ff
include/vec/vec: fix vec_avg implementation

now it's exactly the same as AltiVec's

diff -r 92156fe32755 -r 6c91cd9a2f2d include/vec/vec.h
--- a/include/vec/vec.h	Sun Nov 24 11:15:59 2024 +0000
+++ b/include/vec/vec.h	Mon Nov 25 04:43:22 2024 +0000
@@ -239,19 +239,14 @@
 
 inline vec_intmax vec_avg(vec_intmax x, vec_intmax y)
 {
-    if ((x < 0) == (y < 0)) { // same sign
-        // this gets the equivalent of:
-        // vec_int32 r = ((vec_int64)x + (vec_int64)y) / 2;
-        vec_intmax r = (x / 2) + (y / 2) + (((x % 2) + (y % 2)) / 2);
-
-        // FIXME emulate AltiVec quirks
+    vec_intmax x_d_quot   = (x / 2);
+    vec_intmax x_d_rem    = (x % 2);
+    vec_intmax y_d_quot   = (y / 2);
+    vec_intmax y_d_rem    = (y % 2);
+    vec_intmax rem_d_quot = ((x_d_rem + y_d_rem) / 2);
+    vec_intmax rem_d_rem  = ((x_d_rem + y_d_rem) % 2);
 
-        return r;
-    } else {
-        vec_intmax r = (x + y) / 2;
-        // FIXME emulate AltiVec quirks
-        return r;
-    }
+    return (x_d_quot + y_d_quot) + (rem_d_quot) + (rem_d_rem == 1);
 }
 
 inline vec_uintmax vec_uavg(vec_uintmax x, vec_uintmax y)