Clang from Xcode 5 does not support uxtl.
---
 gas-preprocessor.pl | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gas-preprocessor.pl b/gas-preprocessor.pl
index ed01141..3392668 100755
--- a/gas-preprocessor.pl
+++ b/gas-preprocessor.pl
@@ -629,6 +629,10 @@ sub handle_serialized_line {
         if ($line =~ 
/^\s*movi\s+(v[0-3]?\d\.(?:2|4|8|16)[bhsBHS])\s*,\s*(#\w+)\b\s*$/) {
           $line = "        movi $1, $2, lsl #0\n";
         }
+        # Xcode 5 misses the alias uxtl replace it with the more general ushll
+        if ($line =~ 
/^\s*uxtl(2)?\s+(v[0-3]?\d\.[248][hsdHSD])\s*,\s*(v[0-3]?\d\.(?:4|8|16)[bhsBHS])\b\s*$/)
 {
+          $line = "        ushll$1 $2, $3, #0\n";
+        }
     }
 
     print ASMFILE $line;
-- 
1.8.5.2

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