diff --git a/Zend/asm/save_xmm_x86_64_ms_masm.asm b/Zend/asm/save_xmm_x86_64_ms_masm.asm
new file mode 100644
index 0000000000000..1569d6bdb0e86
--- /dev/null
+++ b/Zend/asm/save_xmm_x86_64_ms_masm.asm
@@ -0,0 +1,43 @@
+.code
+
+; ZEND_API void execute_ex(zend_execute_data *ex)
+PUBLIC execute_ex
+
+EXTERN execute_ex_real:PROC
+
+; Assembly wrapper around the real execute_ex function, so that we can
+; save the preserved registers when re-entering the VM from JIT code.
+; See GH-18136.
+execute_ex PROC EXPORT FRAME
+    ; 10 floating points numbers
+    ; 32 bytes shadow space
+    ; 8 bytes to align after the return address
+    sub rsp, 8*10 + 32 + 8
+    .allocstack 8*10 + 32 + 8
+    .endprolog
+    movsd qword ptr [rsp + 32 + 8*0], xmm6
+    movsd qword ptr [rsp + 32 + 8*1], xmm7
+    movsd qword ptr [rsp + 32 + 8*2], xmm8
+    movsd qword ptr [rsp + 32 + 8*3], xmm9
+    movsd qword ptr [rsp + 32 + 8*4], xmm10
+    movsd qword ptr [rsp + 32 + 8*5], xmm11
+    movsd qword ptr [rsp + 32 + 8*6], xmm12
+    movsd qword ptr [rsp + 32 + 8*7], xmm13
+    movsd qword ptr [rsp + 32 + 8*8], xmm14
+    movsd qword ptr [rsp + 32 + 8*9], xmm15
+    call execute_ex_real
+    movsd xmm6, qword ptr [rsp + 32 + 8*0]
+    movsd xmm7, qword ptr [rsp + 32 + 8*1]
+    movsd xmm8, qword ptr [rsp + 32 + 8*2]
+    movsd xmm9, qword ptr [rsp + 32 + 8*3]
+    movsd xmm10, qword ptr [rsp + 32 + 8*4]
+    movsd xmm11, qword ptr [rsp + 32 + 8*5]
+    movsd xmm12, qword ptr [rsp + 32 + 8*6]
+    movsd xmm13, qword ptr [rsp + 32 + 8*7]
+    movsd xmm14, qword ptr [rsp + 32 + 8*8]
+    movsd xmm15, qword ptr [rsp + 32 + 8*9]
+    add rsp, 8*10 + 32 + 8
+    ret
+execute_ex ENDP
+
+END
diff --git a/Zend/zend_vm_execute.h b/Zend/zend_vm_execute.h
index 5270fc841cd8d..dadc57d13f278 100644
--- a/Zend/zend_vm_execute.h
+++ b/Zend/zend_vm_execute.h
@@ -55037,10 +55037,19 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_NULL_HANDLER(ZEND_OPCODE_HANDL
 # pragma GCC optimize("no-gcse")
 # pragma GCC optimize("no-ivopts")
 #endif
+#ifdef _WIN64
+/* See save_xmm_x86_64_ms_masm.asm */
+void execute_ex_real(zend_execute_data *ex)
+#else
 ZEND_API void execute_ex(zend_execute_data *ex)
+#endif
 {
 	DCL_OPLINE
 
+#if defined(__GNUC__) && defined(__aarch64__)
+	__asm__ __volatile__ (""::: "v8","v9","v10","v11","v12","v13","v14","v15");
+#endif
+
 #if defined(ZEND_VM_IP_GLOBAL_REG) || defined(ZEND_VM_FP_GLOBAL_REG)
 	struct {
 #ifdef ZEND_VM_HYBRID_JIT_RED_ZONE_SIZE
diff --git a/Zend/zend_vm_execute.skl b/Zend/zend_vm_execute.skl
index 717d4ffd3e8af..5b4799cd67c2a 100644
--- a/Zend/zend_vm_execute.skl
+++ b/Zend/zend_vm_execute.skl
@@ -5,10 +5,19 @@
 # pragma GCC optimize("no-gcse")
 # pragma GCC optimize("no-ivopts")
 #endif
+#ifdef _WIN64
+/* See save_xmm_x86_64_ms_masm.asm */
+void {%EXECUTOR_NAME%}_ex_real(zend_execute_data *ex)
+#else
 ZEND_API void {%EXECUTOR_NAME%}_ex(zend_execute_data *ex)
+#endif
 {
 	DCL_OPLINE
 
+#if defined(__GNUC__) && defined(__aarch64__)
+	__asm__ __volatile__ (""::: "v8","v9","v10","v11","v12","v13","v14","v15");
+#endif
+
 	{%HELPER_VARS%}
 
 	{%INTERNAL_LABELS%}
diff --git a/ext/opcache/tests/jit/gh18136.phpt b/ext/opcache/tests/jit/gh18136.phpt
new file mode 100644
index 0000000000000..e1993440003e5
--- /dev/null
+++ b/ext/opcache/tests/jit/gh18136.phpt
@@ -0,0 +1,35 @@
+--TEST--
+GH-18136 (tracing JIT floating point register clobbering on Windows and ARM64)
+--EXTENSIONS--
+opcache
+--INI--
+opcache.jit=tracing
+opcache.jit_buffer_size=64M
+opcache.jit_hot_func=4
+opcache.jit_hot_loop=4
+--FILE--
+<?php
+namespace Foo;
+
+function diff($point1, $point2)
+{
+	$a = deg2rad($point1); // Prefixing these with \ also makes the issue go away
+	$b = deg2rad($point2);
+	return $a - $b;
+}
+
+function getRawDistance()
+{
+	$distance = 0;
+	for ($p = 0; $p < 200; $p++) {
+		// Needs to be a namespaced call_user_func call to reproduce the issue (i.e. adding \ at front makes the issue go away)
+		$distance += call_user_func('Foo\diff', 0, $p);
+	}
+
+	return $distance;
+}
+
+var_dump(getRawDistance());
+?>
+--EXPECT--
+float(-347.3205211468715)
diff --git a/win32/build/config.w32 b/win32/build/config.w32
index 043f18b275b9d..7180e841ebc48 100644
--- a/win32/build/config.w32
+++ b/win32/build/config.w32
@@ -267,7 +267,11 @@ if (TARGET_ARCH == 'arm64') {
 	DEFINE('FIBER_ASM_FLAGS', '/DBOOST_CONTEXT_EXPORT=EXPORT /nologo /c /Fo');
 }
 
-ADD_FLAG('ASM_OBJS', '$(BUILD_DIR)\\Zend\\jump_' + FIBER_ASM_ABI + '.obj $(BUILD_DIR)\\Zend\\make_' + FIBER_ASM_ABI + '.obj');
+var all_asm_objs = '$(BUILD_DIR)\\Zend\\jump_' + FIBER_ASM_ABI + '.obj $(BUILD_DIR)\\Zend\\make_' + FIBER_ASM_ABI + '.obj';
+if (TARGET_ARCH == 'x64') {
+	all_asm_objs += ' $(BUILD_DIR)\\Zend\\save_xmm_x86_64_ms_masm.obj';
+}
+ADD_FLAG('ASM_OBJS', all_asm_objs);
 
 MFO.WriteLine('$(BUILD_DIR)\\Zend\\jump_' + FIBER_ASM_ABI + '.obj: Zend\\asm\\jump_' + FIBER_ASM_ABI + '.asm');
 MFO.WriteLine('\t$(PHP_ASSEMBLER) $(FIBER_ASM_FLAGS) $(BUILD_DIR)\\Zend\\jump_$(FIBER_ASM_ABI).obj Zend\\asm\\jump_$(FIBER_ASM_ABI).asm');
@@ -275,6 +279,11 @@ MFO.WriteLine('\t$(PHP_ASSEMBLER) $(FIBER_ASM_FLAGS) $(BUILD_DIR)\\Zend\\jump_$(
 MFO.WriteLine('$(BUILD_DIR)\\Zend\\make_' + FIBER_ASM_ABI + '.obj: Zend\\asm\\make_' + FIBER_ASM_ABI + '.asm');
 MFO.WriteLine('\t$(PHP_ASSEMBLER) $(FIBER_ASM_FLAGS) $(BUILD_DIR)\\Zend\\make_$(FIBER_ASM_ABI).obj Zend\\asm\\make_$(FIBER_ASM_ABI).asm');
 
+if (TARGET_ARCH == 'x64') {
+	MFO.WriteLine('$(BUILD_DIR)\\Zend\\save_xmm_x86_64_ms_masm.obj: Zend\\asm\\save_xmm_x86_64_ms_masm.asm');
+	MFO.WriteLine('\t$(PHP_ASSEMBLER) $(FIBER_ASM_FLAGS) $(BUILD_DIR)\\Zend\\save_xmm_x86_64_ms_masm.obj Zend\\asm\\save_xmm_x86_64_ms_masm.asm');
+}
+
 ADD_FLAG("CFLAGS_BD_ZEND", "/D ZEND_ENABLE_STATIC_TSRMLS_CACHE=1");
 if (VS_TOOLSET && VCVERS >= 1914) {
 	ADD_FLAG("CFLAGS_BD_ZEND", "/d2FuncCache1");