diff --git a/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp b/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
index e7aa8a234efd9..4cbc8dcffdce1 100644
--- a/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
@@ -89,6 +89,14 @@ static mlir::Value getMaskVecValue(CIRGenFunction &cgf, const CallExpr *expr,
   }
   return maskVec;
 }
+static mlir::Value emitX86CompressExpand(CIRGenFunction &cgf, const CallExpr *expr,ArrayRef<mlir::Value> ops, bool IsCompress, const std::string &ID){
+  auto ResultTy = cast<cir::VectorType>(ops[1].getType());
+  mlir::Value MaskValue = getMaskVecValue(cgf, expr, ops[2],  cast<cir::VectorType>(ResultTy).getSize());
+  llvm::SmallVector<mlir::Value, 4> op{ops[0], ops[1], MaskValue};
+  
+  return emitIntrinsicCallOp(cgf,expr, ID, ResultTy, op);
+
+}
 
 mlir::Value CIRGenFunction::emitX86BuiltinExpr(unsigned builtinID,
                                                const CallExpr *expr) {
@@ -454,7 +462,9 @@ mlir::Value CIRGenFunction::emitX86BuiltinExpr(unsigned builtinID,
   case X86::BI__builtin_ia32_compresshi512_mask:
   case X86::BI__builtin_ia32_compressqi128_mask:
   case X86::BI__builtin_ia32_compressqi256_mask:
-  case X86::BI__builtin_ia32_compressqi512_mask:
+  case X86::BI__builtin_ia32_compressqi512_mask:{
+    return emitX86CompressExpand(*this, expr, ops, true, "x86_avx512_mask_compress");
+  }
   case X86::BI__builtin_ia32_gather3div2df:
   case X86::BI__builtin_ia32_gather3div2di:
   case X86::BI__builtin_ia32_gather3div4df:
diff --git a/clang/test/CIR/CodeGen/X86/builtin_mask_compress.c b/clang/test/CIR/CodeGen/X86/builtin_mask_compress.c
new file mode 100644
index 0000000000000..30c0553dfc8f8
--- /dev/null
+++ b/clang/test/CIR/CodeGen/X86/builtin_mask_compress.c
@@ -0,0 +1,7 @@
+#include <immintrin.h>
+///home/cs25resch11005/myFiles/off_contrib/llvm-project/clang/lib/Headers/avx512vlvbmi2intrin.h
+
+__m128i test_mm_mask_compress(__m128i __S, __mmask8 __U, __m128i __D){
+
+    return (__m128i)_mm_mask_compress_epi16(__S, __U, __D);
+}
\ No newline at end of file
diff --git a/clang/test/CIR/CodeGen/X86/builtin_mask_compress.cir b/clang/test/CIR/CodeGen/X86/builtin_mask_compress.cir
new file mode 100644
index 0000000000000..fd0d35305f115
--- /dev/null
+++ b/clang/test/CIR/CodeGen/X86/builtin_mask_compress.cir
@@ -0,0 +1,83 @@
+!s16i = !cir.int<s, 16>
+!s64i = !cir.int<s, 64>
+!u8i = !cir.int<u, 8>
+#loc3 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":36:25)
+#loc4 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":36:33)
+#loc5 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":36:38)
+#loc6 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":36:47)
+#loc7 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":36:52)
+#loc8 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":36:60)
+#loc18 = loc("builtin_mask_compress.c":4:31)
+#loc19 = loc("builtin_mask_compress.c":4:39)
+#loc20 = loc("builtin_mask_compress.c":4:44)
+#loc21 = loc("builtin_mask_compress.c":4:53)
+#loc22 = loc("builtin_mask_compress.c":4:58)
+#loc23 = loc("builtin_mask_compress.c":4:66)
+#loc32 = loc(fused[#loc3, #loc4])
+#loc33 = loc(fused[#loc5, #loc6])
+#loc34 = loc(fused[#loc7, #loc8])
+#loc38 = loc(fused[#loc18, #loc19])
+#loc39 = loc(fused[#loc20, #loc21])
+#loc40 = loc(fused[#loc22, #loc23])
+module @"/home/cs25resch11005/myFiles/off_contrib/llvm-project/clang/test/CIR/CodeGen/X86/builtin_mask_compress.c" attributes {cir.lang = #cir.lang<c>, cir.module_asm = [], cir.triple = "x86_64-unknown-linux-gnu", dlti.dl_spec = #dlti.dl_spec<!llvm.ptr<270> = dense<32> : vector<4xi64>, !llvm.ptr<271> = dense<32> : vector<4xi64>, !llvm.ptr<272> = dense<64> : vector<4xi64>, i64 = dense<64> : vector<2xi64>, i128 = dense<128> : vector<2xi64>, f80 = dense<128> : vector<2xi64>, !llvm.ptr = dense<64> : vector<4xi64>, i1 = dense<8> : vector<2xi64>, i8 = dense<8> : vector<2xi64>, i16 = dense<16> : vector<2xi64>, i32 = dense<32> : vector<2xi64>, f16 = dense<16> : vector<2xi64>, f64 = dense<64> : vector<2xi64>, f128 = dense<128> : vector<2xi64>, "dlti.endianness" = "little", "dlti.mangling_mode" = "e", "dlti.legal_int_widths" = array<i32: 8, 16, 32, 64>, "dlti.stack_alignment" = 128 : i64>} {
+  cir.func internal private dso_local @_mm_mask_compress_epi16(%arg0: !cir.vector<2 x !s64i> loc(fused[#loc3, #loc4]), %arg1: !u8i loc(fused[#loc5, #loc6]), %arg2: !cir.vector<2 x !s64i> loc(fused[#loc7, #loc8])) -> !cir.vector<2 x !s64i> inline(always) {
+    %0 = cir.alloca !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>>, ["__S", init] {alignment = 16 : i64} loc(#loc32)
+    %1 = cir.alloca !u8i, !cir.ptr<!u8i>, ["__U", init] {alignment = 1 : i64} loc(#loc33)
+    %2 = cir.alloca !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>>, ["__D", init] {alignment = 16 : i64} loc(#loc34)
+    %3 = cir.alloca !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>>, ["__retval"] {alignment = 16 : i64} loc(#loc2)
+    cir.store %arg0, %0 : !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>> loc(#loc9)
+    cir.store %arg1, %1 : !u8i, !cir.ptr<!u8i> loc(#loc9)
+    cir.store %arg2, %2 : !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>> loc(#loc9)
+    %4 = cir.load align(16) %2 : !cir.ptr<!cir.vector<2 x !s64i>>, !cir.vector<2 x !s64i> loc(#loc10)
+    %5 = cir.cast bitcast %4 : !cir.vector<2 x !s64i> -> !cir.vector<8 x !s16i> loc(#loc10)
+    %6 = cir.load align(16) %0 : !cir.ptr<!cir.vector<2 x !s64i>>, !cir.vector<2 x !s64i> loc(#loc11)
+    %7 = cir.cast bitcast %6 : !cir.vector<2 x !s64i> -> !cir.vector<8 x !s16i> loc(#loc11)
+    %8 = cir.load align(1) %1 : !cir.ptr<!u8i>, !u8i loc(#loc12)
+    %9 = cir.cast bitcast %8 : !u8i -> !cir.vector<8 x !cir.int<u, 1>> loc(#loc12)
+    %10 = cir.call_llvm_intrinsic "x86_avx512_mask_compress" %5, %7, %9 : (!cir.vector<8 x !s16i>, !cir.vector<8 x !s16i>, !cir.vector<8 x !cir.int<u, 1>>) -> !cir.vector<8 x !s16i> loc(#loc13)
+    %11 = cir.cast bitcast %10 : !cir.vector<8 x !s16i> -> !cir.vector<2 x !s64i> loc(#loc35)
+    cir.store %11, %3 : !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>> loc(#loc36)
+    %12 = cir.load %3 : !cir.ptr<!cir.vector<2 x !s64i>>, !cir.vector<2 x !s64i> loc(#loc36)
+    cir.return %12 : !cir.vector<2 x !s64i> loc(#loc36)
+  } loc(#loc31)
+  cir.func dso_local @test_mm_mask_compress(%arg0: !cir.vector<2 x !s64i> loc(fused[#loc18, #loc19]), %arg1: !u8i loc(fused[#loc20, #loc21]), %arg2: !cir.vector<2 x !s64i> loc(fused[#loc22, #loc23])) -> !cir.vector<2 x !s64i> inline(never) {
+    %0 = cir.alloca !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>>, ["__S", init] {alignment = 16 : i64} loc(#loc38)
+    %1 = cir.alloca !u8i, !cir.ptr<!u8i>, ["__U", init] {alignment = 1 : i64} loc(#loc39)
+    %2 = cir.alloca !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>>, ["__D", init] {alignment = 16 : i64} loc(#loc40)
+    %3 = cir.alloca !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>>, ["__retval"] {alignment = 16 : i64} loc(#loc17)
+    cir.store %arg0, %0 : !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>> loc(#loc24)
+    cir.store %arg1, %1 : !u8i, !cir.ptr<!u8i> loc(#loc24)
+    cir.store %arg2, %2 : !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>> loc(#loc24)
+    %4 = cir.load align(16) %0 : !cir.ptr<!cir.vector<2 x !s64i>>, !cir.vector<2 x !s64i> loc(#loc25)
+    %5 = cir.load align(1) %1 : !cir.ptr<!u8i>, !u8i loc(#loc26)
+    %6 = cir.load align(16) %2 : !cir.ptr<!cir.vector<2 x !s64i>>, !cir.vector<2 x !s64i> loc(#loc27)
+    %7 = cir.call @_mm_mask_compress_epi16(%4, %5, %6) : (!cir.vector<2 x !s64i>, !u8i, !cir.vector<2 x !s64i>) -> !cir.vector<2 x !s64i> loc(#loc28)
+    cir.store %7, %3 : !cir.vector<2 x !s64i>, !cir.ptr<!cir.vector<2 x !s64i>> loc(#loc41)
+    %8 = cir.load %3 : !cir.ptr<!cir.vector<2 x !s64i>>, !cir.vector<2 x !s64i> loc(#loc41)
+    cir.return %8 : !cir.vector<2 x !s64i> loc(#loc41)
+  } loc(#loc37)
+} loc(#loc)
+#loc = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/clang/test/CIR/CodeGen/X86/builtin_mask_compress.c":0:0)
+#loc1 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":35:1)
+#loc2 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":41:1)
+#loc9 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":37:1)
+#loc10 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":38:64)
+#loc11 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":39:24)
+#loc12 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":40:15)
+#loc13 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":38:20)
+#loc14 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":40:18)
+#loc15 = loc("/home/cs25resch11005/myFiles/off_contrib/llvm-project/build/lib/clang/22/include/avx512vlvbmi2intrin.h":38:3)
+#loc16 = loc("builtin_mask_compress.c":4:1)
+#loc17 = loc("builtin_mask_compress.c":7:1)
+#loc24 = loc("builtin_mask_compress.c":4:70)
+#loc25 = loc("builtin_mask_compress.c":6:45)
+#loc26 = loc("builtin_mask_compress.c":6:50)
+#loc27 = loc("builtin_mask_compress.c":6:55)
+#loc28 = loc("builtin_mask_compress.c":6:21)
+#loc29 = loc("builtin_mask_compress.c":6:5)
+#loc30 = loc("builtin_mask_compress.c":6:58)
+#loc31 = loc(fused[#loc1, #loc2])
+#loc35 = loc(fused[#loc13, #loc14])
+#loc36 = loc(fused[#loc15, #loc14])
+#loc37 = loc(fused[#loc16, #loc17])
+#loc41 = loc(fused[#loc29, #loc30])