[X86] Expose the various _rot intrinsics on non-MS platforms

_rotl, _rotwl and _lrotl (and their right-shift counterparts) are official x86
intrinsics, and should be supported regardless of environment. This is in contrast
to _rotl8, _rotl16, and _rotl64 which are MS-specific.

Note that the MS documentation for _lrotl is different from the Intel 
documentation. Intel explicitly documents it as a 64-bit rotate, while for MS,
since sizeof(unsigned long) for MSVC is always 4, a 32-bit rotate is implied.

Differential Revision: http://reviews.llvm.org/D12271

llvm-svn: 245923

clang/lib/Headers/Intrin.h

@@ -463,26 +463,6 @@ _rotr16(unsigned short _Value, unsigned char _Shift) {
   _Shift &= 0xf;
   return _Shift ? (_Value >> _Shift) | (_Value << (16 - _Shift)) : _Value;
 }
-static __inline__ unsigned int __DEFAULT_FN_ATTRS
-_rotl(unsigned int _Value, int _Shift) {
-  _Shift &= 0x1f;
-  return _Shift ? (_Value << _Shift) | (_Value >> (32 - _Shift)) : _Value;
-}
-static __inline__ unsigned int __DEFAULT_FN_ATTRS
-_rotr(unsigned int _Value, int _Shift) {
-  _Shift &= 0x1f;
-  return _Shift ? (_Value >> _Shift) | (_Value << (32 - _Shift)) : _Value;
-}
-static __inline__ unsigned long __DEFAULT_FN_ATTRS
-_lrotl(unsigned long _Value, int _Shift) {
-  _Shift &= 0x1f;
-  return _Shift ? (_Value << _Shift) | (_Value >> (32 - _Shift)) : _Value;
-}
-static __inline__ unsigned long __DEFAULT_FN_ATTRS
-_lrotr(unsigned long _Value, int _Shift) {
-  _Shift &= 0x1f;
-  return _Shift ? (_Value >> _Shift) | (_Value << (32 - _Shift)) : _Value;
-}
 static
 __inline__ unsigned __int64 __DEFAULT_FN_ATTRS
 _rotl64(unsigned __int64 _Value, int _Shift) {

clang/lib/Headers/immintrin.h

@@ -148,4 +148,58 @@ _writegsbase_u64(unsigned long long __V)
  * whereas others are also available at all times. */
 #include <adxintrin.h>
 
+static __inline__ unsigned short __attribute__((__always_inline__, __nodebug__))
+_rotwl(unsigned short _Value, int _Shift) {
+  _Shift &= 0xf;
+  return _Shift ? (_Value << _Shift) | (_Value >> (16 - _Shift)) : _Value;
+}
+
+static __inline__ unsigned short __attribute__((__always_inline__, __nodebug__))
+_rotwr(unsigned short _Value, int _Shift) {
+  _Shift &= 0xf;
+  return _Shift ? (_Value >> _Shift) | (_Value << (16 - _Shift)) : _Value;
+}
+
+static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__))
+_rotl(unsigned int _Value, int _Shift) {
+  _Shift &= 0x1f;
+  return _Shift ? (_Value << _Shift) | (_Value >> (32 - _Shift)) : _Value;
+}
+
+static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__))
+_rotr(unsigned int _Value, int _Shift) {
+  _Shift &= 0x1f;
+  return _Shift ? (_Value >> _Shift) | (_Value << (32 - _Shift)) : _Value;
+}
+
+/* 
+ * MS defines _lrotl/_lrotr in a slightly incompatible way, since 
+ * unsigned long is always 32-bit in MSVC. 
+ */
+#ifdef _MSC_VER
+static __inline__ unsigned long __attribute__((__always_inline__, __nodebug__))
+_lrotl(unsigned long _Value, int _Shift) {
+  _Shift &= 0x1f;
+  return _Shift ? (_Value << _Shift) | (_Value >> (32 - _Shift)) : _Value;
+}
+
+static __inline__ unsigned long __attribute__((__always_inline__, __nodebug__))
+_lrotr(unsigned long _Value, int _Shift) {
+  _Shift &= 0x1f;
+  return _Shift ? (_Value >> _Shift) | (_Value << (32 - _Shift)) : _Value;
+}
+#else
+static __inline__ unsigned long __attribute__((__always_inline__, __nodebug__))
+_lrotl(unsigned long _Value, int _Shift) {
+  _Shift &= 0x3f;
+  return _Shift ? (_Value << _Shift) | (_Value >> (64 - _Shift)) : _Value;
+}
+
+static __inline__ unsigned long __attribute__((__always_inline__, __nodebug__))
+_lrotr(unsigned long _Value, int _Shift) {
+  _Shift &= 0x3f;
+  return _Shift ? (_Value >> _Shift) | (_Value << (64 - _Shift)) : _Value;
+}
+#endif
+
 #endif /* __IMMINTRIN_H */

clang/test/CodeGen/x86-rot-intrinsics.c

@@ -0,0 +1,89 @@
+// RUN: %clang_cc1 %s -triple=i686-pc-linux -emit-llvm -o - | FileCheck %s 
+// RUN: %clang_cc1 -ffreestanding -fms-extensions -fms-compatibility -fms-compatibility-version=17.00 \
+// RUN:            -triple i686--windows -emit-llvm %s -o - \ 
+// RUN:   | FileCheck %s -check-prefix CHECK  -check-prefix MSC
+
+// Don't include mm_malloc.h, it's system specific.
+#define __MM_MALLOC_H
+
+#ifdef _MSC_VER
+#include <Intrin.h>
+#else
+#include <immintrin.h>
+#endif
+
+#ifdef _MSC_VER
+unsigned char test_rotl8(unsigned char v, unsigned char s) {
+  //MSC-LABEL: test_rotl8
+  //MSC-NOT: call
+  return _rotl8(v, s);
+}
+
+unsigned char test_rotr8(unsigned char v, unsigned char s) {
+  //MSC-LABEL: test_rotr8
+  //MSC-NOT: call
+  return _rotr8(v, s);
+}
+
+unsigned short test_rotl16(unsigned short v, unsigned char s) {
+  //MSC-LABEL: test_rotl16
+  //MSC-NOT: call
+  return _rotl16(v, s);
+}
+
+unsigned short test_rotr16(unsigned short v, unsigned char s) {
+  //MSC-LABEL: test_rotr16
+  //MSC-NOT: call
+  return _rotr16(v, s);
+}
+
+unsigned __int64 test_rotl64(unsigned __int64 v, int s) {
+  //MSC-LABEL: test_rotl64
+  //MSC-NOT: call
+  return _rotl64(v, s);
+}
+
+unsigned __int64 test_rotr64(unsigned __int64 v, int s) {
+  //MSC-LABEL: test_rotr64
+  //MSC-NOT: call
+  return _rotr64(v, s);
+}
+#endif
+
+unsigned short test_rotwl(unsigned short v, unsigned short s) {
+  //CHECK-LABEL: test_rotwl
+  //CHECK-NOT: call
+  return _rotwl(v, s);
+}
+
+unsigned short test_rotwr(unsigned short v, unsigned short s) {
+  //CHECK-LABEL: test_rotwr
+  //CHECK-NOT: call
+  return _rotwr(v, s);
+}
+
+unsigned int test_rotl(unsigned int v, int s) {
+  //CHECK-LABEL: test_rotl
+  //CHECK-NOT: call
+  return _rotl(v, s);
+}
+
+unsigned int test_rotr(unsigned int v, int s) {
+  //CHECK-LABEL: test_rotr
+  //CHECK-NOT: call
+  return _rotr(v, s);
+}
+
+unsigned long test_lrotl(unsigned long v, int s) {
+  //CHECK-LABEL: test_lrotl
+  //CHECK-NOT: call
+  return _lrotl(v, s);
+}
+
+unsigned long test_lrotr(unsigned long v, int s) {
+  //CHECK-LABEL: test_lrotr
+  //CHECK-NOT: call
+  return _lrotr(v, s);
+}
+
+//CHECK-LABEL: attributes