[X86] Add __crc32b/__crc32w/__crc32d/__crc32q intrinsics to match gcc and icc.

gcc has these intrinsics in ia32intrin.h as well. And icc implements them
though they aren't documented in the Intel Intrinsics Guide.

Differential Revision: https://reviews.llvm.org/D59533

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@356609 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Headers/ia32intrin.h

@@ -55,6 +55,92 @@ __writeeflags(unsigned int __f)
 }
 #endif /* !__x86_64__ */
 
+/** Adds the unsigned integer operand to the CRC-32C checksum of the
+ *     unsigned char operand.
+ *
+ *  \headerfile <x86intrin.h>
+ *
+ *  This intrinsic corresponds to the <c> CRC32B </c> instruction.
+ *
+ *  \param __C
+ *     An unsigned integer operand to add to the CRC-32C checksum of operand
+ *     \a  __D.
+ *  \param __D
+ *     An unsigned 8-bit integer operand used to compute the CRC-32C checksum.
+ *  \returns The result of adding operand \a __C to the CRC-32C checksum of
+ *     operand \a __D.
+ */
+static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__, __target__("sse4.2")))
+__crc32b(unsigned int __C, unsigned char __D)
+{
+  return __builtin_ia32_crc32qi(__C, __D);
+}
+
+/** Adds the unsigned integer operand to the CRC-32C checksum of the
+ *     unsigned short operand.
+ *
+ *  \headerfile <x86intrin.h>
+ *
+ *  This intrinsic corresponds to the <c> CRC32W </c> instruction.
+ *
+ *  \param __C
+ *     An unsigned integer operand to add to the CRC-32C checksum of operand
+ *     \a  __D.
+ *  \param __D
+ *     An unsigned 16-bit integer operand used to compute the CRC-32C checksum.
+ *  \returns The result of adding operand \a __C to the CRC-32C checksum of
+ *     operand \a __D.
+ */
+static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__, __target__("sse4.2")))
+__crc32w(unsigned int __C, unsigned short __D)
+{
+  return __builtin_ia32_crc32hi(__C, __D);
+}
+
+/** Adds the unsigned integer operand to the CRC-32C checksum of the
+ *     second unsigned integer operand.
+ *
+ *  \headerfile <x86intrin.h>
+ *
+ *  This intrinsic corresponds to the <c> CRC32D </c> instruction.
+ *
+ *  \param __C
+ *     An unsigned integer operand to add to the CRC-32C checksum of operand
+ *     \a  __D.
+ *  \param __D
+ *     An unsigned 32-bit integer operand used to compute the CRC-32C checksum.
+ *  \returns The result of adding operand \a __C to the CRC-32C checksum of
+ *     operand \a __D.
+ */
+static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__, __target__("sse4.2")))
+__crc32d(unsigned int __C, unsigned int __D)
+{
+  return __builtin_ia32_crc32si(__C, __D);
+}
+
+#ifdef __x86_64__
+/** Adds the unsigned integer operand to the CRC-32C checksum of the
+ *     unsigned 64-bit integer operand.
+ *
+ *  \headerfile <x86intrin.h>
+ *
+ *  This intrinsic corresponds to the <c> CRC32Q </c> instruction.
+ *
+ *  \param __C
+ *     An unsigned integer operand to add to the CRC-32C checksum of operand
+ *     \a  __D.
+ *  \param __D
+ *     An unsigned 64-bit integer operand used to compute the CRC-32C checksum.
+ *  \returns The result of adding operand \a __C to the CRC-32C checksum of
+ *     operand \a __D.
+ */
+static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__, __target__("sse4.2")))
+__crc32q(unsigned long long __C, unsigned long long __D)
+{
+  return __builtin_ia32_crc32di(__C, __D);
+}
+#endif /* __x86_64__ */
+
 static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__))
 __rdpmc(int __A) {
   return __builtin_ia32_rdpmc(__A);

test/CodeGen/x86-crc-builtins.c

@@ -0,0 +1,30 @@
+// RUN: %clang_cc1 -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +sse4.2 -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefixes=CHECK,CHECK64
+// RUN: %clang_cc1 -ffreestanding %s -triple=i686-apple-darwin -target-feature +sse4.2 -emit-llvm -o - -Wall -Werror | FileCheck %s
+
+#include <x86intrin.h>
+
+unsigned int test__crc32b(unsigned int CRC, unsigned char V) {
+// CHECK-LABEL: test__crc32b
+// CHECK: call i32 @llvm.x86.sse42.crc32.32.8(i32 %{{.*}}, i8 %{{.*}})
+  return __crc32b(CRC, V);
+}
+
+unsigned int test__crc32w(unsigned int CRC, unsigned short V) {
+// CHECK-LABEL: test__crc32w
+// CHECK: call i32 @llvm.x86.sse42.crc32.32.16(i32 %{{.*}}, i16 %{{.*}})
+  return __crc32w(CRC, V);
+}
+
+unsigned int test__crc32d(unsigned int CRC, unsigned int V) {
+// CHECK-LABEL: test__crc32d
+// CHECK: call i32 @llvm.x86.sse42.crc32.32.32(i32 %{{.*}}, i32 %{{.*}})
+  return __crc32d(CRC, V);
+}
+
+#ifdef __x86_64__
+unsigned long long test__crc32q(unsigned long long CRC, unsigned long long V) {
+// CHECK64-LABEL: test__crc32q
+// CHECK64: call i64 @llvm.x86.sse42.crc32.64.64(i64 %{{.*}}, i64 %{{.*}})
+  return __crc32q(CRC, V);
+}
+#endif