diff --git a/clang/test/dpct/cmake_migration/case_045/case_045_use_fast_math.cpp b/clang/test/dpct/cmake_migration/case_045/case_045_use_fast_math.cpp
new file mode 100644
index 000000000000..a62d747147a8
--- /dev/null
+++ b/clang/test/dpct/cmake_migration/case_045/case_045_use_fast_math.cpp
@@ -0,0 +1,10 @@
+// RUN: rm -rf %T && mkdir -p %T
+// RUN: cd %T
+// RUN: cp %S/input.cmake ./input.cmake
+// RUN: dpct -in-root ./ -out-root out  ./input.cmake --migrate-build-script-only
+// RUN: echo "begin" > %T/diff.txt
+// RUN: diff --strip-trailing-cr %S/expected.txt %T/out/input.cmake >> %T/diff.txt
+// RUN: echo "end" >> %T/diff.txt
+
+// CHECK: begin
+// CHECK-NEXT: end
diff --git a/clang/test/dpct/cmake_migration/case_045/expected.txt b/clang/test/dpct/cmake_migration/case_045/expected.txt
new file mode 100644
index 000000000000..8bcf9071de66
--- /dev/null
+++ b/clang/test/dpct/cmake_migration/case_045/expected.txt
@@ -0,0 +1,13 @@
+# Compiler options
+set_source_files_properties(fused_softmax/scaled_masked_softmax.dp.cpp
+                            fused_softmax/scaled_upper_triang_masked_softmax.dp.cpp
+                            fused_softmax/scaled_aligned_causal_masked_softmax.dp.cpp
+                            PROPERTIES
+                            COMPILE_OPTIONS "-ffast-math")
+
+# Compiler options
+set_source_files_properties(fused_softmax/scaled_masked_softmax.dp.cpp
+                            fused_softmax/scaled_upper_triang_masked_softmax.dp.cpp
+                            fused_softmax/scaled_aligned_causal_masked_softmax.dp.cpp
+                            PROPERTIES
+                            COMPILE_OPTIONS "-ffast-math")
diff --git a/clang/test/dpct/cmake_migration/case_045/input.cmake b/clang/test/dpct/cmake_migration/case_045/input.cmake
new file mode 100644
index 000000000000..19ba69c47143
--- /dev/null
+++ b/clang/test/dpct/cmake_migration/case_045/input.cmake
@@ -0,0 +1,13 @@
+# Compiler options
+set_source_files_properties(fused_softmax/scaled_masked_softmax.cu
+                            fused_softmax/scaled_upper_triang_masked_softmax.cu
+                            fused_softmax/scaled_aligned_causal_masked_softmax.cu
+                            PROPERTIES
+                            COMPILE_OPTIONS "--use_fast_math")
+
+# Compiler options
+set_source_files_properties(fused_softmax/scaled_masked_softmax.cu
+                            fused_softmax/scaled_upper_triang_masked_softmax.cu
+                            fused_softmax/scaled_aligned_causal_masked_softmax.cu
+                            PROPERTIES
+                            COMPILE_OPTIONS "-use_fast_math")
diff --git a/clang/tools/dpct/DpctOptRules/cmake_script_migration_rule.yaml b/clang/tools/dpct/DpctOptRules/cmake_script_migration_rule.yaml
index ff60d93e2ed3..22aac70f0225 100644
--- a/clang/tools/dpct/DpctOptRules/cmake_script_migration_rule.yaml
+++ b/clang/tools/dpct/DpctOptRules/cmake_script_migration_rule.yaml
@@ -2538,4 +2538,30 @@
       MatchMode: Full
       In: cuda
       Out: ""
-      RuleId: "remove_lib_cuda"
\ No newline at end of file
+      RuleId: "remove_lib_cuda"
+
+- Rule: rule_use_fast_math_one_dash
+  Kind: CMakeRule
+  Priority: Fallback
+  MatchMode: Partial
+  CmakeSyntax: use_fast_math_one_dash
+  In: ${func_name}(${value})
+  Out: ${func_name}(${value})
+  Subrules:
+    value:
+      MatchMode: Full
+      In: -use_fast_math
+      Out: -ffast-math
+
+- Rule: rule_use_fast_math_two_dash
+  Kind: CMakeRule
+  Priority: Fallback
+  MatchMode: Partial
+  CmakeSyntax: use_fast_math_two_dash
+  In: ${func_name}(${value})
+  Out: ${func_name}(${value})
+  Subrules:
+    value:
+      MatchMode: Full
+      In: --use_fast_math
+      Out: -ffast-math