Add support for _outp{|w|d}

Author: MalaySanghi

clang/lib/Headers/intrin.h

@@ -348,6 +348,23 @@ static inline unsigned long _inpd(unsigned short port) {
   return ret;
 }
 
+static inline int _outp(unsigned short port, int data) {
+  __asm__ volatile("outb %b0, %w1" : : "a"(data), "Nd"(port) : "memory");
+  return data;
+}
+
+static inline unsigned short
+_outpw(unsigned short port, unsigned short data) {
+  __asm__ volatile("outw %w0, %w1" : : "a"(data), "Nd"(port) : "memory");
+  return data;
+}
+
+static inline unsigned long _outpd(unsigned short port,
+                                   unsigned long data) {
+  __asm__ volatile("outl %k0, %w1" : : "a"(data), "Nd"(port) : "memory");
+  return data;
+}
+
 #endif
 
 #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)

clang/test/CodeGen/X86/ms-x86-intrinsics.c

@@ -63,7 +63,6 @@ unsigned __int64 test__emulu(unsigned int a, unsigned int b) {
 // CHECK: [[RES:%[0-9]+]] = mul nuw i64 [[Y]], [[X]]
 // CHECK: ret i64 [[RES]]
 
-
 int test_inp(unsigned short port) {
   return _inp(port);
 }
@@ -88,6 +87,30 @@ unsigned long test_inpd(unsigned short port) {
 // CHECK:       [[TMP0:%.*]] = tail call i32 asm sideeffect "inl ${1:w}, ${0:k}", "={ax},N{dx},~{dirflag},~{fpsr},~{flags}"(i16 [[PORT]])
 // CHECK-NEXT:  ret i32 [[TMP0]]
 
+int test_outp(unsigned short port, int data) {
+    return _outp(port, data);
+}
+// CHECK-LABEL: i32 @test_outp(
+// CHECK-SAME:  [[PORT:%.*]], i32 noundef returned [[DATA:%.*]])
+// CHECK-NEXT:  tail call void asm sideeffect "outb ${0:b}, ${1:w}", "{ax},N{dx},~{memory},~{dirflag},~{fpsr},~{flags}"(i32 [[DATA]], i16 [[PORT]]
+// CHECK-NEXT:  ret i32 [[DATA]]
+
+unsigned short test_outpw(unsigned short port, unsigned short data) {
+    return _outpw(port, data);
+}
+// CHECK-LABEL: i16 @test_outpw(
+// CHECK-SAME:  [[PORT:%.*]], i16 noundef returned zeroext [[DATA:%.*]])
+// CHECK-NEXT:  tail call void asm sideeffect "outw ${0:w}, ${1:w}", "{ax},N{dx},~{memory},~{dirflag},~{fpsr},~{flags}"(i16 [[DATA]], i16 [[PORT]])
+// CHECK-NEXT:  ret i16 [[DATA]]
+
+unsigned long test_outpd(unsigned short port, unsigned long data) {
+    return _outpd(port, data);
+}
+// CHECK-LABEL: i32 @test_outpd(
+// CHECK-SAME:  [[PORT:%.*]], i32 noundef returned [[DATA:%.*]])
+// CHECK-NEXT:  tail call void asm sideeffect "outl ${0:k}, ${1:w}", "{ax},N{dx},~{memory},~{dirflag},~{fpsr},~{flags}"(i32 [[DATA]], i16 [[PORT]])
+// CHECK-NEXT:  ret i32 [[DATA]]
+
 #if defined(__x86_64__)
 
 char test__readgsbyte(unsigned long Offset) {