[clang] [X86]Add support for _outp{|w|d} (PR #93774)

[Malay Sanghi via cfe-commits]

================
@@ -63,6 +63,91 @@ unsigned __int64 test__emulu(unsigned int a, unsigned int b) {
 // CHECK: [[RES:%[0-9]+]] = mul nuw i64 [[Y]], [[X]]
 // CHECK: ret i64 [[RES]]
 
+//
+// CHECK-I386-LABEL: define dso_local noundef i32 @test_outp(
+// CHECK-I386-SAME: i16 noundef zeroext [[PORT:%.*]], i32 noundef returned [[DATA:%.*]]) local_unnamed_addr #[[ATTR2:[0-9]+]] {
+// CHECK-I386-NEXT:  [[ENTRY:.*:]]
+// CHECK-I386-NEXT:    tail call void asm sideeffect "outb ${0:b}, ${1:w}", "{ax},N{dx},~{dirflag},~{fpsr},~{flags}"(i32 [[DATA]], i16 [[PORT]]) #[[ATTR3:[0-9]+]], !srcloc [[META4:![0-9]+]]
+// CHECK-I386-NEXT:    ret i32 [[DATA]]
+//
+// CHECK-X64-LABEL: define dso_local noundef i32 @test_outp(
+// CHECK-X64-SAME: i16 noundef [[PORT:%.*]], i32 noundef returned [[DATA:%.*]]) local_unnamed_addr #[[ATTR1:[0-9]+]] {
+// CHECK-X64-NEXT:  [[ENTRY:.*:]]
+// CHECK-X64-NEXT:    tail call void asm sideeffect "outb ${0:b}, ${1:w}", "{ax},N{dx},~{dirflag},~{fpsr},~{flags}"(i32 [[DATA]], i16 [[PORT]]) #[[ATTR5:[0-9]+]], !srcloc [[META3:![0-9]+]]
+// CHECK-X64-NEXT:    ret i32 [[DATA]]
+//
----------------
MalaySanghi wrote:

updated

https://github.com/llvm/llvm-project/pull/93774