From 05b92eee2c5f5792d148b671e67fc92392e99eee Mon Sep 17 00:00:00 2001
From: Erik Schnetter <schnetter@gmail.com>
Date: Mon, 9 Sep 2013 16:37:48 -0400
Subject: Use __builtin_clzs if available

---
 vec_pseudo.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'vec_pseudo.h')

diff --git a/vec_pseudo.h b/vec_pseudo.h
index c553fa3..ec3bcb2 100644
--- a/vec_pseudo.h
+++ b/vec_pseudo.h
@@ -368,10 +368,12 @@ namespace vecmathlib {
         for (int d=0; d<size; ++d) res.v[d] = __builtin_clzll(v[d]);
       } else if (sizeof(int_t) == sizeof(long)) {
         for (int d=0; d<size; ++d) res.v[d] = __builtin_clzl(v[d]);
-      } else if (sizeof(int_t) <= sizeof(int)) {
+      } else if (sizeof(int_t) == sizeof(int)) {
+        for (int d=0; d<size; ++d) res.v[d] = __builtin_clz(v[d]);
+      } else if (sizeof(int_t) <= sizeof(short)) {
         for (int d=0; d<size; ++d)
           res.v[d] =
-            CHAR_BIT * (sizeof(int) - sizeof(int_t)) + __builtin_clz(v[d]);
+            CHAR_BIT * (sizeof(short) - sizeof(int_t)) + __builtin_clzs(v[d]);
       } else {
         __builtin_unreachable();
       }
-- 
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