diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -219,5 +219,94 @@
 __attribute__((clang_builtin_alias(__builtin_elementwise_trunc)))
 double4 trunc(double4);
 
+// log builtins
+#ifdef __HLSL_ENABLE_16_BIT
+__attribute__((clang_builtin_alias(__builtin_elementwise_log))) half log(half);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+half2 log(half2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+half3 log(half3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+half4 log(half4);
+#endif
+
+__attribute__((clang_builtin_alias(__builtin_elementwise_log))) float
+log(float);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+float2 log(float2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+float3 log(float3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+float4 log(float4);
+
+__attribute__((clang_builtin_alias(__builtin_elementwise_log))) double
+log(double);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+double2 log(double2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+double3 log(double3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log)))
+double4 log(double4);
+
+// log2 builtins
+#ifdef __HLSL_ENABLE_16_BIT
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+half log2(half);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+half2 log2(half2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+half3 log2(half3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+half4 log2(half4);
+#endif
+
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2))) float
+log2(float);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+float2 log2(float2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+float3 log2(float3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+float4 log2(float4);
+
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2))) double
+log2(double);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+double2 log2(double2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+double3 log2(double3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log2)))
+double4 log2(double4);
+
+// log10 builtins
+#ifdef __HLSL_ENABLE_16_BIT
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+half log10(half);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+half2 log10(half2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+half3 log10(half3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+half4 log10(half4);
+#endif
+
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10))) float
+log10(float);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+float2 log10(float2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+float3 log10(float3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+float4 log10(float4);
+
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10))) double
+log10(double);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+double2 log10(double2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+double3 log10(double3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_log10)))
+double4 log10(double4);
+
 } // namespace hlsl
 #endif //_HLSL_HLSL_INTRINSICS_H_
diff --git a/clang/test/CodeGenHLSL/builtins/log.hlsl b/clang/test/CodeGenHLSL/builtins/log.hlsl
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/log.hlsl
@@ -0,0 +1,56 @@
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -O3 -o - | FileCheck %s
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -emit-llvm -disable-llvm-passes \
+// RUN:   -D__HLSL_ENABLE_16_BIT -o - | FileCheck %s --check-prefix=NO_HALF
+
+// CHECK: define noundef half @
+// CHECK: call half @llvm.log.f16(
+// NO_HALF: define noundef float @"?test_log_half@@YA$halff@$halff@@Z"(
+// NO_HALF: call float @llvm.log.f32(
+half test_log_half ( half p0 ) {
+  return log ( p0 );
+}
+// CHECK: define noundef <2 x half> @
+// CHECK: call <2 x half> @llvm.log.v2f16
+// NO_HALF: define noundef <2 x float> @"?test_log_float2@@YAT?$__vector@M$01@__clang@@T12@@Z"(
+// NO_HALF: call <2 x float> @llvm.log.v2f32(
+half2 test_log_half2 ( half2 p0 ) {
+  return log ( p0 );
+}
+// CHECK: define noundef <3 x half> @
+// CHECK: call <3 x half> @llvm.log.v3f16
+// NO_HALF: define noundef <3 x float> @"?test_log_float3@@YAT?$__vector@M$02@__clang@@T12@@Z"(
+// NO_HALF: call <3 x float> @llvm.log.v3f32(
+half3 test_log_half3 ( half3 p0 ) {
+  return log ( p0 );
+}
+// CHECK: define noundef <4 x half> @
+// CHECK: call <4 x half> @llvm.log.v4f16
+// NO_HALF: define noundef <4 x float> @"?test_log_float4@@YAT?$__vector@M$03@__clang@@T12@@Z"(
+// NO_HALF: call <4 x float> @llvm.log.v4f32(
+half4 test_log_half4 ( half4 p0 ) {
+  return log ( p0 );
+}
+
+// CHECK: define noundef float @
+// CHECK: call float @llvm.log.f32(
+float test_log_float ( float p0 ) {
+  return log ( p0 );
+}
+// CHECK: define noundef <2 x float> @
+// CHECK: call <2 x float> @llvm.log.v2f32
+float2 test_log_float2 ( float2 p0 ) {
+  return log ( p0 );
+}
+// CHECK: define noundef <3 x float> @
+// CHECK: call <3 x float> @llvm.log.v3f32
+float3 test_log_float3 ( float3 p0 ) {
+  return log ( p0 );
+}
+// CHECK: define noundef <4 x float> @
+// CHECK: call <4 x float> @llvm.log.v4f32
+float4 test_log_float4 ( float4 p0 ) {
+  return log ( p0 );
+}
diff --git a/clang/test/CodeGenHLSL/builtins/log10.hlsl b/clang/test/CodeGenHLSL/builtins/log10.hlsl
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/log10.hlsl
@@ -0,0 +1,56 @@
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -O3 -o - | FileCheck %s
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -emit-llvm -disable-llvm-passes \
+// RUN:   -D__HLSL_ENABLE_16_BIT -o - | FileCheck %s --check-prefix=NO_HALF
+
+// CHECK: define noundef half @
+// CHECK: call half @llvm.log10.f16(
+// NO_HALF: define noundef float @"?test_log10_half@@YA$halff@$halff@@Z"(
+// NO_HALF: call float @llvm.log10.f32(
+half test_log10_half ( half p0 ) {
+  return log10 ( p0 );
+}
+// CHECK: define noundef <2 x half> @
+// CHECK: call <2 x half> @llvm.log10.v2f16
+// NO_HALF: define noundef <2 x float> @"?test_log10_float2@@YAT?$__vector@M$01@__clang@@T12@@Z"(
+// NO_HALF: call <2 x float> @llvm.log10.v2f32(
+half2 test_log10_half2 ( half2 p0 ) {
+  return log10 ( p0 );
+}
+// CHECK: define noundef <3 x half> @
+// CHECK: call <3 x half> @llvm.log10.v3f16
+// NO_HALF: define noundef <3 x float> @"?test_log10_float3@@YAT?$__vector@M$02@__clang@@T12@@Z"(
+// NO_HALF: call <3 x float> @llvm.log10.v3f32(
+half3 test_log10_half3 ( half3 p0 ) {
+  return log10 ( p0 );
+}
+// CHECK: define noundef <4 x half> @
+// CHECK: call <4 x half> @llvm.log10.v4f16
+// NO_HALF: define noundef <4 x float> @"?test_log10_float4@@YAT?$__vector@M$03@__clang@@T12@@Z"(
+// NO_HALF: call <4 x float> @llvm.log10.v4f32(
+half4 test_log10_half4 ( half4 p0 ) {
+  return log10 ( p0 );
+}
+
+// CHECK: define noundef float @
+// CHECK: call float @llvm.log10.f32(
+float test_log10_float ( float p0 ) {
+  return log10 ( p0 );
+}
+// CHECK: define noundef <2 x float> @
+// CHECK: call <2 x float> @llvm.log10.v2f32
+float2 test_log10_float2 ( float2 p0 ) {
+  return log10 ( p0 );
+}
+// CHECK: define noundef <3 x float> @
+// CHECK: call <3 x float> @llvm.log10.v3f32
+float3 test_log10_float3 ( float3 p0 ) {
+  return log10 ( p0 );
+}
+// CHECK: define noundef <4 x float> @
+// CHECK: call <4 x float> @llvm.log10.v4f32
+float4 test_log10_float4 ( float4 p0 ) {
+  return log10 ( p0 );
+}
diff --git a/clang/test/CodeGenHLSL/builtins/log2.hlsl b/clang/test/CodeGenHLSL/builtins/log2.hlsl
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/log2.hlsl
@@ -0,0 +1,56 @@
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -O3 -o - | FileCheck %s
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -emit-llvm -disable-llvm-passes \
+// RUN:   -D__HLSL_ENABLE_16_BIT -o - | FileCheck %s --check-prefix=NO_HALF
+
+// CHECK: define noundef half @
+// CHECK: call half @llvm.log2.f16(
+// NO_HALF: define noundef float @"?test_log2_half@@YA$halff@$halff@@Z"(
+// NO_HALF: call float @llvm.log2.f32(
+half test_log2_half ( half p0 ) {
+  return log2 ( p0 );
+}
+// CHECK: define noundef <2 x half> @
+// CHECK: call <2 x half> @llvm.log2.v2f16
+// NO_HALF: define noundef <2 x float> @"?test_log2_float2@@YAT?$__vector@M$01@__clang@@T12@@Z"(
+// NO_HALF: call <2 x float> @llvm.log2.v2f32(
+half2 test_log2_half2 ( half2 p0 ) {
+  return log2 ( p0 );
+}
+// CHECK: define noundef <3 x half> @
+// CHECK: call <3 x half> @llvm.log2.v3f16
+// NO_HALF: define noundef <3 x float> @"?test_log2_float3@@YAT?$__vector@M$02@__clang@@T12@@Z"(
+// NO_HALF: call <3 x float> @llvm.log2.v3f32(
+half3 test_log2_half3 ( half3 p0 ) {
+  return log2 ( p0 );
+}
+// CHECK: define noundef <4 x half> @
+// CHECK: call <4 x half> @llvm.log2.v4f16
+// NO_HALF: define noundef <4 x float> @"?test_log2_float4@@YAT?$__vector@M$03@__clang@@T12@@Z"(
+// NO_HALF: call <4 x float> @llvm.log2.v4f32(
+half4 test_log2_half4 ( half4 p0 ) {
+  return log2 ( p0 );
+}
+
+// CHECK: define noundef float @
+// CHECK: call float @llvm.log2.f32(
+float test_log2_float ( float p0 ) {
+  return log2 ( p0 );
+}
+// CHECK: define noundef <2 x float> @
+// CHECK: call <2 x float> @llvm.log2.v2f32
+float2 test_log2_float2 ( float2 p0 ) {
+  return log2 ( p0 );
+}
+// CHECK: define noundef <3 x float> @
+// CHECK: call <3 x float> @llvm.log2.v3f32
+float3 test_log2_float3 ( float3 p0 ) {
+  return log2 ( p0 );
+}
+// CHECK: define noundef <4 x float> @
+// CHECK: call <4 x float> @llvm.log2.v4f32
+float4 test_log2_float4 ( float4 p0 ) {
+  return log2 ( p0 );
+}