test-suite: add cpu features detection in configuration

Summary:
This patch adds opportunity to detect cpu features via configuration, which can be used later in Makefiles. I'm preparing some tests, which use specific cpu features, so I don't want them to fail on machines without such features. Unfortunately, most of buildbots use configure+make approach, so I propose this patch for configure and makefiles structure. 
This additional m4 script is based on "ax_gcc_x86_cpu_support" and "ax_check_x86_features", scripts from autoconf base.

Patch with similar feature for cmake - [[https://reviews.llvm.org/D38484|D38484]]

Reviewers: zvi, eladcohen, steven_wu, anemet, MatzeB

Reviewed By: MatzeB

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D38182

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@321142 91177308-0d34-0410-b5e6-96231b3b80d8

Author: itaraban

Makefile.config.in

@@ -229,3 +229,22 @@ SKIDMARKS10_ROOT := @SKIDMARKS10_ROOT@
 
 # Get the shared library (dll) extension
 SHLIBEXT = @SHLIBEXT@
+
+# Get CPU features
+HAVE_X86_AVX2_INSTRUCTIONS := @HAVE_X86_AVX2_INSTRUCTIONS@
+HAVE_X86_AVX512F_INSTRUCTIONS := @HAVE_X86_AVX512F_INSTRUCTIONS@
+HAVE_X86_AVX512VL_INSTRUCTIONS := @HAVE_X86_AVX512VL_INSTRUCTIONS@
+HAVE_X86_AVX512BW_INSTRUCTIONS := @HAVE_X86_AVX512BW_INSTRUCTIONS@
+HAVE_X86_AVX512DQ_INSTRUCTIONS := @HAVE_X86_AVX512DQ_INSTRUCTIONS@
+HAVE_X86_AVX_INSTRUCTIONS := @HAVE_X86_AVX_INSTRUCTIONS@
+HAVE_X86_BMI2_INSTRUCTIONS := @HAVE_X86_BMI2_INSTRUCTIONS@
+HAVE_X86_BMI_INSTRUCTIONS := @HAVE_X86_BMI_INSTRUCTIONS@
+HAVE_X86_FMA4_INSTRUCTIONS := @HAVE_X86_FMA4_INSTRUCTIONS@
+HAVE_X86_FMA_INSTRUCTIONS := @HAVE_X86_FMA_INSTRUCTIONS@
+HAVE_X86_MMX_INSTRUCTIONS := @HAVE_X86_MMX_INSTRUCTIONS@
+HAVE_X86_POPCNT_INSTRUCTIONS := @HAVE_X86_POPCNT_INSTRUCTIONS@
+HAVE_X86_SSE2_INSTRUCTIONS := @HAVE_X86_SSE2_INSTRUCTIONS@
+HAVE_X86_SSE3_INSTRUCTIONS := @HAVE_X86_SSE3_INSTRUCTIONS@
+HAVE_X86_SSE4_1_INSTRUCTIONS := @HAVE_X86_SSE4_1_INSTRUCTIONS@
+HAVE_X86_SSE4_2_INSTRUCTIONS := @HAVE_X86_SSE4_2_INSTRUCTIONS@
+HAVE_X86_SSE_INSTRUCTIONS := @HAVE_X86_SSE_INSTRUCTIONS@

autoconf/configure.ac

@@ -359,6 +359,13 @@ AC_PROG_CPP
 
 dnl Verify that GCC is version 3.0 or higher
 
+dnl Get CPU features
+if (test "$llvm_cv_target_arch" == "x86" ||
+    test "$llvm_cv_target_arch" == "x86_64")
+then 
+CHECK_X86_FEATURES
+fi
+
 dnl Check for GNU Make.  We use its extensions too, so don't build without it
 AC_CHECK_GNU_MAKE
 if test -z "$llvm_cv_gnu_make_command" ; then

autoconf/m4/get_cpu_target.m4

@@ -0,0 +1,61 @@
+dnl This macro checks features using gcc and cpuinit
+dnl Set variables HAVE_X86_$feature_INSTRUCTIONS into 
+dnl the configure.config.
+dnl Based on ax_gcc_x86_cpu_support and ax_check_x86_features.
+
+AC_DEFUN_ONCE([CPU_INIT],
+ [AC_LANG_PUSH([C])
+  AC_CACHE_CHECK([for gcc __builtin_cpu_init function],
+    [ax_cv_check_x86_cpu_init],
+    [AC_RUN_IFELSE(
+      [AC_LANG_PROGRAM([#include <stdlib.h>],
+        [__builtin_cpu_init ();])
+      ],
+      [ax_cv_check_x86_cpu_init=yes],
+      [ax_cv_check_x86_cpu_init=no])])
+  AS_IF([test "X$ax_cv_check_x86_cpu_init" = "Xno"],
+    [AC_MSG_ERROR([Need GCC to support X86 CPU features tests])])
+])
+
+AC_DEFUN([CPU_SUPPORTS],
+  [AC_REQUIRE([AC_PROG_CC])
+   AC_REQUIRE([CPU_INIT])
+   AC_LANG_PUSH([C])
+   AS_VAR_PUSHDEF([feature], [AS_TR_SH([ax_cv_cpu_supports_$1])])
+   AC_CACHE_CHECK([for x86 $1 instruction support],
+     [feature],
+     [AC_RUN_IFELSE(
+       [AC_LANG_PROGRAM( [#include <stdlib.h> ],
+       [ __builtin_cpu_init ();
+         if (__builtin_cpu_supports("$1"))
+           return 0;
+         return 1;
+        ])],
+        [feature=yes],
+        [feature=no]
+     )]
+   )
+   AC_LANG_POP([C])
+   AS_IF([test "$feature" = "yes"],
+         [AC_SUBST(
+           AS_TR_CPP([HAVE_X86_$1_INSTRUCTIONS]),
+           [1],
+           [Define if $1 instructions are supported])
+         ],
+          [AC_SUBST(
+           AS_TR_CPP([HAVE_X86_$1_INSTRUCTIONS]),
+           [0])
+          ]
+         )
+   AS_VAR_POPDEF([feature])
+])
+
+
+AC_DEFUN([CHECK_X86_FEATURES],
+ [m4_foreach_w(
+   [feature],
+   [mmx popcnt sse sse2 sse3 sse4.1 sse4.2 avx avx2 avx512f avx512vl avx512bw avx512dq fma fma4 bmi bmi2],
+   [CPU_SUPPORTS(feature)])
+  $2
+])
+