Add MMX SIMD implementation of computationally intensive routines.

git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@17 632fc199-4ca6-4c93-a231-07263d6284db

1 files changed, 6 insertions, 0 deletions

diff --git a/jdct.h b/jdct.h
index c834410..7b49a97 100644
--- a/jdct.h
+++ b/jdct.h
@@ -28,10 +28,16 @@
  */
 
 #if BITS_IN_JSAMPLE == 8
+#ifndef WITH_SIMD
 typedef int DCTELEM;		/* 16 or 32 bits is fine */
 typedef unsigned int UDCTELEM;
 typedef unsigned long long UDCTELEM2;
 #else
+typedef short DCTELEM;  /* prefer 16 bit with SIMD for parellelism */
+typedef unsigned short UDCTELEM;
+typedef unsigned int UDCTELEM2;
+#endif
+#else
 typedef INT32 DCTELEM;		/* must have 32 bits */
 typedef UINT32 UDCTELEM;
 typedef unsigned long long UDCTELEM2;