add cross-ref links

diff --git a/3d_gpu/isa_to_virtual_regs.mdwn b/3d_gpu/isa_to_virtual_regs.mdwn
index a486389c49666e565c5b8f196c4b8b6aa6185fd3..f94ae28fc447d4b50c0e1faab155d5541f3e4cf3 100644 (file)
--- a/3d_gpu/isa_to_virtual_regs.mdwn
+++ b/3d_gpu/isa_to_virtual_regs.mdwn
@@ -1,5 +1,10 @@
 # Lookup table for Virtual Registers including renaming
 
+Links
+
+* <https://groups.google.com/g/comp.arch/c/vdgvrYGoxTM/m/KerzlHs0BgAJ>
+* <https://bugs.libre-soc.org/show_bug.cgi?id=352>
+
 [[!img isa_to_virtual_regs_table.jpg size="850x"]]
 
 Explanation: