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-rw-r--r--apps/sigils.subx2
1 files changed, 2 insertions, 0 deletions
diff --git a/apps/sigils.subx b/apps/sigils.subx
index 74ec48b9..b076d24e 100644
--- a/apps/sigils.subx
+++ b/apps/sigils.subx
@@ -41,6 +41,8 @@
 #
 # No metadata allowed inside '*(...)'.
 # Whitespace inside '*(...)' is ok. But not immediately after the '*' or '%'.
+# We don't support conversions to floating-point registers. In particular, so
+# far there's no %xmm1.
 #
 # The code generated is sub-optimal:
 #   - displacements are always disp32, even when disp8 will do