X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/catacomb/blobdiff_plain/70bc6059902c30dcbd1cddbdb628e4bcbd9cc6f5..a13b573023a59dc1e2febef1142aa4b1d1af67b7:/base/asm-common.h

diff --git a/base/asm-common.h b/base/asm-common.h
index 0d32ccf9..20a1d6a8 100644
--- a/base/asm-common.h
+++ b/base/asm-common.h
@@ -170,6 +170,12 @@ name:
 #  define INTADDR__1(addr, got) addr
 #endif
 
+// Permutations for SIMD instructions.  SHUF(D, C, B, A) is an immediate,
+// suitable for use in `pshufd' or `shufpd', which copies element D
+// (0 <= D < 4) of the source to element 3 of the destination, element C to
+// element 2, element B to element 1, and element A to element 0.
+#define SHUF(d, c, b, a) (64*(d) + 16*(c) + 4*(b) + (a))
+
 #endif
 
 ///--------------------------------------------------------------------------