diff --git a/basis/compiler/cfg/instructions/instructions.factor b/basis/compiler/cfg/instructions/instructions.factor
index 5712455988..d4d84a088a 100644
--- a/basis/compiler/cfg/instructions/instructions.factor
+++ b/basis/compiler/cfg/instructions/instructions.factor
@@ -417,12 +417,12 @@ def: dst/scalar-rep
 use: src
 literal: rep ;
 
-PURE-INSN: ##horizontal-shl-vector
+PURE-INSN: ##horizontal-shl-vector-imm
 def: dst
 use: src1
 literal: src2 rep ;
 
-PURE-INSN: ##horizontal-shr-vector
+PURE-INSN: ##horizontal-shr-vector-imm
 def: dst
 use: src1
 literal: src2 rep ;
@@ -462,6 +462,16 @@ def: dst
 use: src
 literal: rep ;
 
+PURE-INSN: ##shl-vector-imm
+def: dst
+use: src1
+literal: src2 rep ;
+
+PURE-INSN: ##shr-vector-imm
+def: dst
+use: src1
+literal: src2 rep ;
+
 PURE-INSN: ##shl-vector
 def: dst
 use: src1 src2/int-scalar-rep
diff --git a/basis/compiler/cfg/intrinsics/intrinsics.factor b/basis/compiler/cfg/intrinsics/intrinsics.factor
index 2af810ba49..a03f04f182 100644
--- a/basis/compiler/cfg/intrinsics/intrinsics.factor
+++ b/basis/compiler/cfg/intrinsics/intrinsics.factor
@@ -187,10 +187,10 @@ IN: compiler.cfg.intrinsics
         { math.vectors.simd.intrinsics:(simd-vany?) [ [ vcc-any ^^test-vector ] emit-unary-vector-op ] }
         { math.vectors.simd.intrinsics:(simd-vall?) [ [ vcc-all ^^test-vector ] emit-unary-vector-op ] }
         { math.vectors.simd.intrinsics:(simd-vnone?) [ [ vcc-none ^^test-vector ] emit-unary-vector-op ] }
-        { math.vectors.simd.intrinsics:(simd-vlshift) [ [ ^^shl-vector ] emit-binary-vector-op ] }
-        { math.vectors.simd.intrinsics:(simd-vrshift) [ [ ^^shr-vector ] emit-binary-vector-op ] }
-        { math.vectors.simd.intrinsics:(simd-hlshift) [ [ ^^horizontal-shl-vector ] emit-horizontal-shift ] }
-        { math.vectors.simd.intrinsics:(simd-hrshift) [ [ ^^horizontal-shr-vector ] emit-horizontal-shift ] }
+        { math.vectors.simd.intrinsics:(simd-vlshift) [ [ ^^shl-vector-imm ] [ ^^shl-vector ] emit-shift-vector-op ] }
+        { math.vectors.simd.intrinsics:(simd-vrshift) [ [ ^^shr-vector-imm ] [ ^^shr-vector ] emit-shift-vector-op ] }
+        { math.vectors.simd.intrinsics:(simd-hlshift) [ [ ^^horizontal-shl-vector-imm ] emit-shift-vector-imm-op ] }
+        { math.vectors.simd.intrinsics:(simd-hrshift) [ [ ^^horizontal-shr-vector-imm ] emit-shift-vector-imm-op ] }
         { math.vectors.simd.intrinsics:(simd-with) [ [ ^^with-vector ] emit-unary-vector-op ] }
         { math.vectors.simd.intrinsics:(simd-gather-2) [ emit-gather-vector-2 ] }
         { math.vectors.simd.intrinsics:(simd-gather-4) [ emit-gather-vector-4 ] }
diff --git a/basis/compiler/cfg/intrinsics/simd/simd.factor b/basis/compiler/cfg/intrinsics/simd/simd.factor
index 84646be78b..a8dfaab2dd 100644
--- a/basis/compiler/cfg/intrinsics/simd/simd.factor
+++ b/basis/compiler/cfg/intrinsics/simd/simd.factor
@@ -55,10 +55,15 @@ MACRO: if-literals-match ( quots -- )
 : [unary/param] ( quot -- quot' )
     '[ [ -2 inc-d ds-pop ] 2dip @ ds-push ] ; inline
 
-: emit-horizontal-shift ( node quot -- )
+: emit-shift-vector-imm-op ( node quot -- )
     [unary/param]
     { [ integer? ] [ representation? ] } if-literals-match ; inline
 
+:: emit-shift-vector-op ( node imm-quot var-quot -- )
+    node node-input-infos 2 tail-slice* first literal>> integer?
+    [ node imm-quot emit-shift-vector-imm-op ]
+    [ node var-quot emit-binary-vector-op ] if ; inline
+
 : emit-gather-vector-2 ( node -- )
     [ ^^gather-vector-2 ] emit-binary-vector-op ;
 
@@ -241,6 +246,14 @@ MACRO: if-literals-match ( quots -- )
                 src zero rep ^^merge-vector-head
             ]
         }
+        {
+            [ rep widen-vector-rep %shr-vector-imm-reps member? ]
+            [
+                src src rep ^^merge-vector-head
+                rep rep-component-type
+                heap-size 8 * rep widen-vector-rep ^^shr-vector-imm
+            ]
+        }
         [
             rep ^^zero-vector :> zero
             zero src rep cc> ^^compare-vector :> sign
@@ -268,6 +281,14 @@ MACRO: if-literals-match ( quots -- )
                 src zero rep ^^merge-vector-tail
             ]
         }
+        {
+            [ rep widen-vector-rep %shr-vector-imm-reps member? ]
+            [
+                src src rep ^^merge-vector-tail
+                rep rep-component-type
+                heap-size 8 * rep widen-vector-rep ^^shr-vector-imm
+            ]
+        }
         [
             rep ^^zero-vector :> zero
             zero src rep cc> ^^compare-vector :> sign
diff --git a/basis/compiler/codegen/codegen.factor b/basis/compiler/codegen/codegen.factor
index e8f3ca7d64..15c4e14ac1 100755
--- a/basis/compiler/codegen/codegen.factor
+++ b/basis/compiler/codegen/codegen.factor
@@ -181,14 +181,16 @@ CODEGEN: ##dot-vector %dot-vector
 CODEGEN: ##sqrt-vector %sqrt-vector
 CODEGEN: ##horizontal-add-vector %horizontal-add-vector
 CODEGEN: ##horizontal-sub-vector %horizontal-sub-vector
-CODEGEN: ##horizontal-shl-vector %horizontal-shl-vector
-CODEGEN: ##horizontal-shr-vector %horizontal-shr-vector
+CODEGEN: ##horizontal-shl-vector-imm %horizontal-shl-vector-imm
+CODEGEN: ##horizontal-shr-vector-imm %horizontal-shr-vector-imm
 CODEGEN: ##abs-vector %abs-vector
 CODEGEN: ##and-vector %and-vector
 CODEGEN: ##andn-vector %andn-vector
 CODEGEN: ##or-vector %or-vector
 CODEGEN: ##xor-vector %xor-vector
 CODEGEN: ##not-vector %not-vector
+CODEGEN: ##shl-vector-imm %shl-vector-imm
+CODEGEN: ##shr-vector-imm %shr-vector-imm
 CODEGEN: ##shl-vector %shl-vector
 CODEGEN: ##shr-vector %shr-vector
 CODEGEN: ##integer>scalar %integer>scalar
diff --git a/basis/cpu/architecture/architecture.factor b/basis/cpu/architecture/architecture.factor
index c411d97558..75fbb85542 100644
--- a/basis/cpu/architecture/architecture.factor
+++ b/basis/cpu/architecture/architecture.factor
@@ -107,6 +107,16 @@ scalar-rep ;
         { ulonglong-scalar-rep longlong-scalar-rep }
     } ?at drop ;
 
+: widen-vector-rep ( rep -- rep' )
+    {
+        { char-16-rep     short-8-rep     }
+        { short-8-rep     int-4-rep       }
+        { int-4-rep       longlong-2-rep  }
+        { uchar-16-rep    ushort-8-rep    }
+        { ushort-8-rep    uint-4-rep      }
+        { uint-4-rep      ulonglong-2-rep }
+    } at ;
+
 ! Register classes
 SINGLETONS: int-regs float-regs ;
 
@@ -277,8 +287,10 @@ HOOK: %xor-vector cpu ( dst src1 src2 rep -- )
 HOOK: %not-vector cpu ( dst src rep -- )
 HOOK: %shl-vector cpu ( dst src1 src2 rep -- )
 HOOK: %shr-vector cpu ( dst src1 src2 rep -- )
-HOOK: %horizontal-shl-vector cpu ( dst src1 src2 rep -- )
-HOOK: %horizontal-shr-vector cpu ( dst src1 src2 rep -- )
+HOOK: %shl-vector-imm cpu ( dst src1 src2 rep -- )
+HOOK: %shr-vector-imm cpu ( dst src1 src2 rep -- )
+HOOK: %horizontal-shl-vector-imm cpu ( dst src1 src2 rep -- )
+HOOK: %horizontal-shr-vector-imm cpu ( dst src1 src2 rep -- )
 
 HOOK: %integer>scalar cpu ( dst src rep -- )
 HOOK: %scalar>integer cpu ( dst src rep -- )
@@ -324,8 +336,10 @@ HOOK: %xor-vector-reps cpu ( -- reps )
 HOOK: %not-vector-reps cpu ( -- reps )
 HOOK: %shl-vector-reps cpu ( -- reps )
 HOOK: %shr-vector-reps cpu ( -- reps )
-HOOK: %horizontal-shl-vector-reps cpu ( -- reps )
-HOOK: %horizontal-shr-vector-reps cpu ( -- reps )
+HOOK: %shl-vector-imm-reps cpu ( -- reps )
+HOOK: %shr-vector-imm-reps cpu ( -- reps )
+HOOK: %horizontal-shl-vector-imm-reps cpu ( -- reps )
+HOOK: %horizontal-shr-vector-imm-reps cpu ( -- reps )
 
 M: object %zero-vector-reps { } ;
 M: object %fill-vector-reps { } ;
@@ -366,8 +380,10 @@ M: object %xor-vector-reps { } ;
 M: object %not-vector-reps { } ;
 M: object %shl-vector-reps { } ;
 M: object %shr-vector-reps { } ;
-M: object %horizontal-shl-vector-reps { } ;
-M: object %horizontal-shr-vector-reps { } ;
+M: object %shl-vector-imm-reps { } ;
+M: object %shr-vector-imm-reps { } ;
+M: object %horizontal-shl-vector-imm-reps { } ;
+M: object %horizontal-shr-vector-imm-reps { } ;
 
 HOOK: %unbox-alien cpu ( dst src -- )
 HOOK: %unbox-any-c-ptr cpu ( dst src temp -- )
diff --git a/basis/cpu/x86/x86.factor b/basis/cpu/x86/x86.factor
index 07b21c9612..869f973b30 100644
--- a/basis/cpu/x86/x86.factor
+++ b/basis/cpu/x86/x86.factor
@@ -1155,18 +1155,18 @@ M: x86 %horizontal-add-vector-reps
         { sse3? { float-4-rep double-2-rep } }
     } available-reps ;
 
-M: x86 %horizontal-shl-vector ( dst src1 src2 rep -- )
+M: x86 %horizontal-shl-vector-imm ( dst src1 src2 rep -- )
     two-operand PSLLDQ ;
 
-M: x86 %horizontal-shl-vector-reps
+M: x86 %horizontal-shl-vector-imm-reps
     {
         { sse2? { char-16-rep uchar-16-rep short-8-rep ushort-8-rep int-4-rep uint-4-rep longlong-2-rep ulonglong-2-rep } }
     } available-reps ;
 
-M: x86 %horizontal-shr-vector ( dst src1 src2 rep -- )
+M: x86 %horizontal-shr-vector-imm ( dst src1 src2 rep -- )
     two-operand PSRLDQ ;
 
-M: x86 %horizontal-shr-vector-reps
+M: x86 %horizontal-shr-vector-imm-reps
     {
         { sse2? { char-16-rep uchar-16-rep short-8-rep ushort-8-rep int-4-rep uint-4-rep longlong-2-rep ulonglong-2-rep } }
     } available-reps ;
@@ -1282,6 +1282,11 @@ M: x86 %shr-vector-reps
         { sse2? { short-8-rep ushort-8-rep int-4-rep uint-4-rep ulonglong-2-rep } }
     } available-reps ;
 
+M: x86 %shl-vector-imm %shl-vector ;
+M: x86 %shl-vector-imm-reps %shl-vector-reps ;
+M: x86 %shr-vector-imm %shr-vector ;
+M: x86 %shr-vector-imm-reps %shr-vector-reps ;
+
 : scalar-sized-reg ( reg rep -- reg' )
     rep-size 8 * n-bit-version-of ;
 
diff --git a/basis/math/vectors/simd/intrinsics/intrinsics.factor b/basis/math/vectors/simd/intrinsics/intrinsics.factor
index 649e444915..003b42fe83 100644
--- a/basis/math/vectors/simd/intrinsics/intrinsics.factor
+++ b/basis/math/vectors/simd/intrinsics/intrinsics.factor
@@ -181,8 +181,8 @@ M: vector-rep supported-simd-op?
         { \ (simd-vnot)          [ %xor-vector-reps            ] }
         { \ (simd-vlshift)       [ %shl-vector-reps            ] }
         { \ (simd-vrshift)       [ %shr-vector-reps            ] }
-        { \ (simd-hlshift)       [ %horizontal-shl-vector-reps ] }
-        { \ (simd-hrshift)       [ %horizontal-shr-vector-reps ] }
+        { \ (simd-hlshift)       [ %horizontal-shl-vector-imm-reps ] }
+        { \ (simd-hrshift)       [ %horizontal-shr-vector-imm-reps ] }
         { \ (simd-vshuffle-elements) [ (%shuffle-imm-reps)         ] }
         { \ (simd-vshuffle-bytes)    [ %shuffle-vector-reps        ] }
         { \ (simd-(vmerge-head)) [ %merge-vector-reps          ] }