diff --git a/src/include/OpenImageIO/simd.h b/src/include/OpenImageIO/simd.h
index 03e2cee491..7c69117ad0 100644
--- a/src/include/OpenImageIO/simd.h
+++ b/src/include/OpenImageIO/simd.h
@@ -306,14 +306,14 @@ class vfloat16;
 // These are removed from visibility for the OIIO codebase itself, or for any
 // downstream project that defines OIIO_DISABLE_DEPRECATED to exclude
 // declarations deprecated as of version 1.9 or later.
-typedef vbool4 mask4;    // old name
-typedef vbool4 bool4;
-typedef vbool8 bool8;
-typedef vint4 int4;
-typedef vint8 int8;
-typedef vfloat3 float3;
-typedef vfloat4 float4;
-typedef vfloat8 float8;
+OIIO_DEPRECATED("use vbool4") typedef vbool4 mask4;    // old name
+OIIO_DEPRECATED("use vbool4") typedef vbool4 bool4;
+OIIO_DEPRECATED("use vbool8") typedef vbool8 bool8;
+OIIO_DEPRECATED("use vint4") typedef vint4 int4;
+OIIO_DEPRECATED("use vint8") typedef vint8 int8;
+OIIO_DEPRECATED("use vfloat3") typedef vfloat3 float3;
+OIIO_DEPRECATED("use vfloat4") typedef vfloat4 float4;
+OIIO_DEPRECATED("use vfloat8") typedef vfloat8 float8;
 #endif
 
 } // namespace simd
@@ -964,10 +964,6 @@ class vint4 {
     typedef vbool4 vbool_t;   ///< bool type of the same length
     typedef vfloat4 vfloat_t; ///< float type of the same length
     typedef vint4 vint_t;     ///< int type of the same length
-    OIIO_DEPRECATED("use vbool_t (1.8)")
-    typedef vbool4 bool_t;   // old name (deprecated 1.8)
-    OIIO_DEPRECATED("use vfloat_t (1.8)")
-    typedef vfloat4 float_t; // old name (deprecated 1.8)
     static constexpr size_t size() noexcept { return elements; }
 
     /// Default constructor (contents undefined)
@@ -1225,6 +1221,7 @@ vint4 max (const vint4& a, const vint4& b);
 /// Circular bit rotate by s bits, for N values at once.
 vint4 rotl (const vint4& x, const int s);
 // DEPRECATED(2.1)
+OIIO_DEPRECATED("Use rotl instead")
 vint4 rotl32 (const vint4& x, const unsigned int k);
 
 /// andnot(a,b) returns ((~a) & b)
@@ -1260,10 +1257,6 @@ class vint8 {
     typedef vbool8 vbool_t;   ///< bool type of the same length
     typedef vfloat8 vfloat_t; ///< float type of the same length
     typedef vint8 vint_t;     ///< int type of the same length
-    OIIO_DEPRECATED("use vbool_t (1.8)")
-    typedef vbool8 bool_t;   // old name (deprecated 1.8)
-    OIIO_DEPRECATED("use vfloat_t (1.8)")
-    typedef vfloat8 float_t; // old name (deprecated 1.8)
     static constexpr size_t size() noexcept { return elements; }
 
     /// Default constructor (contents undefined)
@@ -1534,6 +1527,7 @@ vint8 max (const vint8& a, const vint8& b);
 /// Circular bit rotate by s bits, for N values at once.
 vint8 rotl (const vint8& x, const int s);
 // DEPRECATED(2.1)
+OIIO_DEPRECATED("Use rotl instead")
 vint8 rotl32 (const vint8& x, const unsigned int k);
 
 /// andnot(a,b) returns ((~a) & b)
@@ -1564,10 +1558,6 @@ class vint16 {
     typedef vbool16 vbool_t;   ///< bool type of the same length
     typedef vfloat16 vfloat_t; ///< float type of the same length
     typedef vint16 vint_t;     ///< int type of the same length
-    OIIO_DEPRECATED("use vbool_t (1.8)")
-    typedef vbool16 bool_t;   // old name (deprecated 1.8)
-    OIIO_DEPRECATED("use vfloat_t (1.8)")
-    typedef vfloat16 float_t; // old name (deprecated 1.8)
     static constexpr size_t size() noexcept { return elements; }
 
     /// Default constructor (contents undefined)
@@ -1850,6 +1840,7 @@ vint16 max (const vint16& a, const vint16& b);
 /// Circular bit rotate by s bits, for N values at once.
 vint16 rotl (const vint16& x, const int s);
 // DEPRECATED(2.1)
+OIIO_DEPRECATED("Use rotl instead")
 vint16 rotl32 (const vint16& x, const unsigned int k);
 
 /// andnot(a,b) returns ((~a) & b)
@@ -1881,10 +1872,6 @@ class vfloat4 {
     typedef vfloat4 vfloat_t; ///< SIMD int type
     typedef vint4 vint_t;     ///< SIMD int type
     typedef vbool4 vbool_t;   ///< SIMD bool type
-    OIIO_DEPRECATED("use vbool_t (1.8)")
-    typedef vint4 int_t;      // old name (deprecated 1.8)
-    OIIO_DEPRECATED("use vfloat_t (1.8)")
-    typedef vbool4 bool_t;    // old name (deprecated 1.8)
     static constexpr size_t size() noexcept { return elements; }
 
     /// Default constructor (contents undefined)
@@ -2556,10 +2543,6 @@ class vfloat8 {
     typedef vfloat8 vfloat_t; ///< SIMD int type
     typedef vint8 vint_t;     ///< SIMD int type
     typedef vbool8 vbool_t;   ///< SIMD bool type
-    OIIO_DEPRECATED("use vint_t (1.8)")
-    typedef vint8 int_t;      // old name (deprecated 1.8)
-    OIIO_DEPRECATED("use vbool_t (1.8)")
-    typedef vbool8 bool_t;    // old name (deprecated 1.8)
     static constexpr size_t size() noexcept { return elements; }
 
     /// Default constructor (contents undefined)
@@ -2823,6 +2806,7 @@ vfloat8 sign (const vfloat8& a);   ///< 1.0 when value >= 0, -1 when negative
 vfloat8 ceil (const vfloat8& a);
 vfloat8 floor (const vfloat8& a);
 vint8 ifloor (const vfloat8& a);    ///< (int)floor
+OIIO_DEPRECATED("Use ifloor instead")
 inline vint8 floori (const vfloat8& a) { return ifloor(a); }  // DEPRECATED(1.8) alias
 
 /// Per-element round to nearest integer.
@@ -2874,10 +2858,6 @@ class vfloat16 {
     typedef vfloat16 vfloat_t; ///< SIMD int type
     typedef vint16 vint_t;     ///< SIMD int type
     typedef vbool16 vbool_t;   ///< SIMD bool type
-    OIIO_DEPRECATED("use vint_t (1.8)")
-    typedef vint16 int_t;      // old name (deprecated 1.8)
-    OIIO_DEPRECATED("use vbool_t (1.8)")
-    typedef vbool16 bool_t;    // old name (deprecated 1.8)
     static constexpr size_t size() noexcept { return elements; }
 
     /// Default constructor (contents undefined)
@@ -4849,9 +4829,6 @@ OIIO_FORCEINLINE vint4 bitcast_to_int (const vbool4& x)
 #endif
 }
 
-// Old names: (DEPRECATED 1.8)
-OIIO_DEPRECATED("use bitcast_to_int() (1.8)")
-inline vint4 bitcast_to_int4 (const vbool4& x) { return bitcast_to_int(x); }
 
 
 OIIO_FORCEINLINE vint4 vreduce_add (const vint4& v) {
@@ -5003,6 +4980,7 @@ OIIO_FORCEINLINE vint4 rotl(const vint4& x, int s) {
 }
 
 // DEPRECATED (2.1)
+OIIO_DEPRECATED("Use rotl instead")
 OIIO_FORCEINLINE vint4 rotl32 (const vint4& x, const unsigned int k) {
     return rotl(x, k);
 }
@@ -5831,6 +5809,7 @@ OIIO_FORCEINLINE vint8 rotl(const vint8& x, int s) {
 }
 
 // DEPRECATED (2.1)
+OIIO_DEPRECATED("Use rotl instead")
 OIIO_FORCEINLINE vint8 rotl32 (const vint8& x, const unsigned int k) {
     return rotl(x, k);
 }
@@ -6638,6 +6617,7 @@ OIIO_FORCEINLINE vint16 rotl(const vint16& x, int s) {
 }
 
 // DEPRECATED (2.1)
+OIIO_DEPRECATED("Use rotl instead")
 OIIO_FORCEINLINE vint16 rotl32 (const vint16& x, const unsigned int k) {
     return rotl(x, k);
 }