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diff --git a/3d_gpu/architecture/dynamic_simd/simdscope.mdwn b/3d_gpu/architecture/dynamic_simd/simdscope.mdwn
index f1b3c9639615ec0dd170707105cd6caddca35552..a81358c6928bd71f1d1de69d2185640d937b4e07 100644 (file)
--- a/3d_gpu/architecture/dynamic_simd/simdscope.mdwn
+++ b/3d_gpu/architecture/dynamic_simd/simdscope.mdwn
@@ -27,7 +27,8 @@ SimdScope is used as follows:
         a = s.Signal(64)
         b = s.Signal(32)
 
-    m.d.comb += b.eq(a[:32])
+    with m.If(a > Const(2)):
+        m.d.comb += b.eq(a[:32])
 
 Note that the scalar parameter is selected from a runtime/compiletime
 configuration parameter which can alter the context between scalar and