Guard x86_64 code path

1 files changed, 1 insertions, 1 deletions

diff --git a/donna_64.h b/donna_64.h
index 537e313c..d98ad640 100644
--- a/donna_64.h
+++ b/donna_64.h
@@ -64,7 +64,7 @@ struct word128 { word64 lo, hi; };
 # define lo128(a) (a.lo)

 # define hi128(a) (a.hi)

 

-#elif defined(__GNUC__)

+#elif defined(__GNUC__) && (defined(__amd64__) || defined(__x86_64__))

 struct word128 { word64 lo, hi; };

 # define mul64x64_128(out,a,b) __asm__ ("mulq %3" : "=a" (out.lo), "=d" (out.hi) : "a" (a), "rm" (b));

 # define shr128_pair(out,hi,lo,shift) __asm__ ("shrdq %2,%1,%0" : "+r" (lo) : "r" (hi), "J" (shift)); out = lo;