diff --git a/src/intrinsic/llvm.rs b/src/intrinsic/llvm.rs
index 2287c96b41b..614bdbe26b8 100644
--- a/src/intrinsic/llvm.rs
+++ b/src/intrinsic/llvm.rs
@@ -182,7 +182,10 @@ pub fn adjust_intrinsic_arguments<'a, 'b, 'gcc, 'tcx>(
             | "__builtin_ia32_vplzcntd_128_mask"
             | "__builtin_ia32_vplzcntq_512_mask"
             | "__builtin_ia32_vplzcntq_256_mask"
-            | "__builtin_ia32_vplzcntq_128_mask" => {
+            | "__builtin_ia32_vplzcntq_128_mask"
+            | "__builtin_ia32_cvtqq2pd128_mask"
+            | "__builtin_ia32_cvtqq2pd256_mask"
+            | "__builtin_ia32_cvtqq2ps256_mask" => {
                 let mut new_args = args.to_vec();
                 // Remove last arg as it doesn't seem to be used in GCC and is always false.
                 new_args.pop();
@@ -378,6 +381,23 @@ pub fn adjust_intrinsic_arguments<'a, 'b, 'gcc, 'tcx>(
                 );
                 args = vec![arg.get_address(None)].into();
             }
+            "__builtin_ia32_cvtqq2pd512_mask" | "__builtin_ia32_cvtqq2ps512_mask" => {
+                let mut old_args = args.to_vec();
+                let mut new_args = vec![];
+                new_args.push(old_args.swap_remove(0));
+                let arg2_type = gcc_func.get_param_type(1);
+                let vector_type = arg2_type.dyncast_vector().expect("vector type");
+                let zero = builder.context.new_rvalue_zero(vector_type.get_element_type());
+                let num_units = vector_type.get_num_units();
+                let first_arg =
+                    builder.context.new_rvalue_from_vector(None, arg2_type, &vec![zero; num_units]);
+                new_args.push(first_arg);
+                let arg3_type = gcc_func.get_param_type(2);
+                let minus_one = builder.context.new_rvalue_from_int(arg3_type, -1);
+                new_args.push(minus_one);
+                new_args.push(old_args.swap_remove(0));
+                args = new_args.into();
+            }
             _ => (),
         }
     } else {
@@ -987,6 +1007,29 @@ pub fn intrinsic<'gcc, 'tcx>(name: &str, cx: &CodegenCx<'gcc, 'tcx>) -> Function
         "llvm.x86.avx512.vpdpbusds.128" => "__builtin_ia32_vpdpbusds_v4si",
         "llvm.x86.xsave" => "__builtin_ia32_xsave",
         "llvm.x86.xsaveopt" => "__builtin_ia32_xsaveopt",
+        "llvm.x86.avx512.mask.loadu.w.512" => "__builtin_ia32_loaddquhi512_mask",
+        "llvm.x86.avx512.mask.loadu.b.512" => "__builtin_ia32_loaddquqi512_mask",
+        "llvm.x86.avx512.mask.loadu.w.256" => "__builtin_ia32_loaddquhi256_mask",
+        "llvm.x86.avx512.mask.loadu.b.256" => "__builtin_ia32_loaddquqi256_mask",
+        "llvm.x86.avx512.mask.loadu.w.128" => "__builtin_ia32_loaddquhi128_mask",
+        "llvm.x86.avx512.mask.loadu.b.128" => "__builtin_ia32_loaddquqi128_mask",
+        "llvm.x86.avx512.mask.storeu.w.512" => "__builtin_ia32_storedquhi512_mask",
+        "llvm.x86.avx512.mask.storeu.b.512" => "__builtin_ia32_storedquqi512_mask",
+        "llvm.x86.avx512.mask.storeu.w.256" => "__builtin_ia32_storedquhi256_mask",
+        "llvm.x86.avx512.mask.storeu.b.256" => "__builtin_ia32_storedquqi256_mask",
+        "llvm.x86.avx512.mask.storeu.w.128" => "__builtin_ia32_storedquhi128_mask",
+        "llvm.x86.avx512.mask.storeu.b.128" => "__builtin_ia32_storedquqi128_mask",
+        "llvm.x86.avx512.mask.expand.load.w.512" => "__builtin_ia32_expandloadhi512_mask",
+        "llvm.x86.avx512.mask.expand.load.w.256" => "__builtin_ia32_expandloadhi256_mask",
+        "llvm.x86.avx512.mask.expand.load.w.128" => "__builtin_ia32_expandloadhi128_mask",
+        "llvm.x86.avx512.mask.expand.load.b.512" => "__builtin_ia32_expandloadqi512_mask",
+        "llvm.x86.avx512.mask.expand.load.b.256" => "__builtin_ia32_expandloadqi256_mask",
+        "llvm.x86.avx512.mask.expand.load.b.128" => "__builtin_ia32_expandloadqi128_mask",
+        "llvm.x86.avx512.sitofp.round.v8f64.v8i64" => "__builtin_ia32_cvtqq2pd512_mask",
+        "llvm.x86.avx512.sitofp.round.v2f64.v2i64" => "__builtin_ia32_cvtqq2pd128_mask",
+        "llvm.x86.avx512.sitofp.round.v4f64.v4i64" => "__builtin_ia32_cvtqq2pd256_mask",
+        "llvm.x86.avx512.sitofp.round.v8f32.v8i64" => "__builtin_ia32_cvtqq2ps512_mask",
+        "llvm.x86.avx512.sitofp.round.v4f32.v4i64" => "__builtin_ia32_cvtqq2ps256_mask",
 
         // NOTE: this file is generated by https://github.com/GuillaumeGomez/llvmint/blob/master/generate_list.py
         _ => include!("archs.rs"),
diff --git a/src/intrinsic/simd.rs b/src/intrinsic/simd.rs
index d1b4a9689a9..a0d8ff6346f 100644
--- a/src/intrinsic/simd.rs
+++ b/src/intrinsic/simd.rs
@@ -201,7 +201,7 @@ macro_rules! require_simd {
         bx.context.new_bitcast(None, shuffled, v_type)
     };
 
-    if name == sym::simd_bswap || name == sym::simd_bitreverse {
+    if matches!(name, sym::simd_bswap | sym::simd_bitreverse | sym::simd_ctpop) {
         require!(
             bx.type_kind(bx.element_type(llret_ty)) == TypeKind::Integer,
             InvalidMonomorphization::UnsupportedOperation { span, name, in_ty, in_elem }
@@ -212,6 +212,22 @@ macro_rules! require_simd {
         return Ok(simd_bswap(bx, args[0].immediate()));
     }
 
+    let simd_ctpop = |bx: &mut Builder<'a, 'gcc, 'tcx>, vector: RValue<'gcc>| -> RValue<'gcc> {
+        let mut vector_elements = vec![];
+        let elem_ty = bx.element_type(llret_ty);
+        for i in 0..in_len {
+            let index = bx.context.new_rvalue_from_long(bx.ulong_type, i as i64);
+            let element = bx.extract_element(vector, index).to_rvalue();
+            let result = bx.context.new_cast(None, bx.pop_count(element), elem_ty);
+            vector_elements.push(result);
+        }
+        bx.context.new_rvalue_from_vector(None, llret_ty, &vector_elements)
+    };
+
+    if name == sym::simd_ctpop {
+        return Ok(simd_ctpop(bx, args[0].immediate()));
+    }
+
     // We use a different algorithm from non-vector bitreverse to take advantage of most
     // processors' vector shuffle units.  It works like this:
     // 1. Generate pre-reversed low and high nibbles as a vector.