[ms] Reintroduce feature guards in intrinsic headers in Microsoft mode

Visual Studio's C++ standard library headers include intrin.h, so the intrinsic
headers get included a lot more often in Microsoft mode than elsewhere. The
AVX512 intrinsics are a lot of code (0.7 MB, causing 30% compile time overhead
for small programs including e.g. <string> and 6% compile time overhead for
larger projects like e.g. v8). Since multiversioning can't be relied on in
Microsoft mode (cl.exe doesn't support it), having faster compiles seems like
the much better tradeoff until we have a better intrinsic story going forward
(which we'll need for e.g. PR19898).

Actually using intrinsics on Windows already requires the right /arch:
settings, so this patch should have no big behavior change.

See also thread "The intrinsics headers (especially avx512) are too big. What
to do about it?" on cfe-dev.

http://reviews.llvm.org/D20291

llvm-svn: 269675

clang/lib/Headers/immintrin.h

@@ -24,22 +24,41 @@
 #ifndef __IMMINTRIN_H
 #define __IMMINTRIN_H
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__MMX__)
 #include <mmintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__SSE__)
 #include <xmmintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__SSE2__)
 #include <emmintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__SSE3__)
 #include <pmmintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__SSSE3__)
 #include <tmmintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || \
+    (defined(__SSE4_2__) || defined(__SSE4_1__))
 #include <smmintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || \
+    (defined(__AES__) || defined(__PCLMUL__))
 #include <wmmintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX__)
 #include <avxintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX2__)
 #include <avx2intrin.h>
 
 /* The 256-bit versions of functions in f16cintrin.h.
@@ -54,45 +73,90 @@ _mm256_cvtph_ps(__m128i __a)
 {
   return (__m256)__builtin_ia32_vcvtph2ps256((__v8hi)__a);
 }
+#endif /* __AVX2__ */
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__BMI__)
 #include <bmiintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__BMI2__)
 #include <bmi2intrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__LZCNT__)
 #include <lzcntintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__FMA__)
 #include <fmaintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512F__)
 #include <avx512fintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512VL__)
 #include <avx512vlintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512BW__)
 #include <avx512bwintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512CD__)
 #include <avx512cdintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512DQ__)
 #include <avx512dqintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || \
+    (defined(__AVX512VL__) && defined(__AVX512BW__))
 #include <avx512vlbwintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || \
+    (defined(__AVX512VL__) && defined(__AVX512CD__))
 #include <avx512vlcdintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || \
+    (defined(__AVX512VL__) && defined(__AVX512DQ__))
 #include <avx512vldqintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512ER__)
 #include <avx512erintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512IFMA__)
 #include <avx512ifmaintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || \
+    (defined(__AVX512IFMA__) && defined(__AVX512VL__))
 #include <avx512ifmavlintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512VBMI__)
 #include <avx512vbmiintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || \
+    (defined(__AVX512VBMI__) && defined(__AVX512VL__))
 #include <avx512vbmivlintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__AVX512PF__)
 #include <avx512pfintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__PKU__)
 #include <pkuintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__RDRND__)
 static __inline__ int __attribute__((__always_inline__, __nodebug__, __target__("rdrnd")))
 _rdrand16_step(unsigned short *__p)
 {
@@ -112,7 +176,9 @@ _rdrand64_step(unsigned long long *__p)
   return __builtin_ia32_rdrand64_step(__p);
 }
 #endif
+#endif /* __RDRND__ */
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__FSGSBASE__)
 #ifdef __x86_64__
 static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__, __target__("fsgsbase")))
 _readfsbase_u32(void)
@@ -162,22 +228,36 @@ _writegsbase_u64(unsigned long long __V)
   return __builtin_ia32_wrgsbase64(__V);
 }
 #endif
+#endif /* __FSGSBASE__ */
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__RTM__)
 #include <rtmintrin.h>
-
 #include <xtestintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__SHA__)
 #include <shaintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__FXSR__)
 #include <fxsrintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__XSAVE__)
 #include <xsaveintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__XSAVEOPT__)
 #include <xsaveoptintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__XSAVEC__)
 #include <xsavecintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__XSAVES__)
 #include <xsavesintrin.h>
+#endif
 
 /* Some intrinsics inside adxintrin.h are available only on processors with ADX,
  * whereas others are also available at all times. */

clang/lib/Headers/x86intrin.h

@@ -28,29 +28,53 @@
 
 #include <immintrin.h>
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__3dNOW__)
 #include <mm3dnow.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__BMI__)
 #include <bmiintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__BMI2__)
 #include <bmi2intrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__LZCNT__)
 #include <lzcntintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__POPCNT__)
 #include <popcntintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__RDSEED__)
 #include <rdseedintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__PRFCHW__)
 #include <prfchwintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__SSE4A__)
 #include <ammintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__FMA4__)
 #include <fma4intrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__XOP__)
 #include <xopintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__TBM__)
 #include <tbmintrin.h>
+#endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__F16C__)
 #include <f16cintrin.h>
+#endif
 
 /* FIXME: LWP */
 

clang/test/CodeGen/ms-mm-align.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -ffreestanding -fms-extensions -fms-compatibility -fms-compatibility-version=17.00 \
+// RUN: %clang_cc1 -ffreestanding -fms-extensions -fms-compatibility -fms-compatibility-version=17.00 -target-feature +sse \
 // RUN:         -triple i686--windows -emit-llvm %s -o - \
 // RUN:         | FileCheck %s -check-prefix CHECK