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diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
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--- a/gcc/doc/md.texi
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@@ -2020,6 +2020,22 @@ Floating-point register that can hold 32- or 64-bit values.
@item e
Floating-point register that can hold 64- or 128-bit values.
+@item c
+Floating-point condition code register.
+
+@item d
+Floating-point register that can hold 32- or 64-bit values.
+It is only valid on the SPARC-V9 architecture when the Visual
+Instructions Set is available.
+
+@item b
+Floating-point register that can hold 64- or 128-bit values.
+It is only valid on the SPARC-V9 architecture when the Visual
+Instructions Set is available.
+
+@item h
+64-bit global or out register for the SPARC-V8+ architecture.
+
@item I
Signed 13-bit constant