[X86] Support intrinsic _mm_cldemote

[craig.topper]

clang/lib/Headers/cldemoteintrin.h

27

CLDRMOTE->CLDEMOTE

[skan]

Fix typo

[craig.topper]

LGTM

clang/lib/Headers/cldemoteintrin.h

 
 #ifndef __CLDEMOTEINTRIN_H
 #define __CLDEMOTEINTRIN_H
 
 /* Define the default attributes for the functions in this file. */
 #define __DEFAULT_FN_ATTRS \
   __attribute__((__always_inline__, __nodebug__,  __target__("cldemote")))
 
+/// Hint to hardware that the cache line that contains \p __P should be demoted
+/// from the cache closest to the processor core to a level more distant from
+/// the processor core.
+///
+/// \headerfile <x86intrin.h>
+///
+/// This intrinsic corresponds to the <c> CLDRMOTE </c> instruction.
 static __inline__ void __DEFAULT_FN_ATTRS
 _cldemote(const void * __P) {
   __builtin_ia32_cldemote(__P);
 }
 
+#define _mm_cldemote(p) _cldemote(p)
 #undef __DEFAULT_FN_ATTRS
 
 #endif

clang/test/CodeGen/cldemote.c

 // RUN: %clang_cc1 %s -ffreestanding -triple=x86_64-unknown-unknown -target-feature +cldemote -emit-llvm -o - -Wall -Werror | FileCheck %s
 // RUN: %clang_cc1 %s -ffreestanding -triple=i386-unknown-unknown -target-feature +cldemote -emit-llvm -o - -Wall -Werror | FileCheck %s
 
 #include <immintrin.h>
 
 void test_cldemote(const void *p) {
   //CHECK-LABEL: @test_cldemote
   //CHECK: call void @llvm.x86.cldemote(i8* %{{.*}})
   _cldemote(p);
+  //CHECK: call void @llvm.x86.cldemote(i8* %{{.*}})
+  _mm_cldemote(p);
 }