From: Bart Van Assche <bvanassche@acm.org>
Date: Tue, 14 Sep 2010 10:53:57 +0000 (+0000)
Subject: Added configure test that checks whether the assembler supports the SSE4a instruction... 
X-Git-Tag: svn/VALGRIND_3_6_0~100
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8063b7b3f939da9b9d72510a5dd906581c43d56;p=thirdparty%2Fvalgrind.git

Added configure test that checks whether the assembler supports the SSE4a instruction lzcnt.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11357
---

diff --git a/configure.in b/configure.in
index a47fede39f..424a4047d0 100644
--- a/configure.in
+++ b/configure.in
@@ -1410,6 +1410,24 @@ AC_MSG_RESULT([no])
 AM_CONDITIONAL(BUILD_SSSE3_TESTS, test x$ac_have_as_ssse3 = xyes)
 
 
+AC_MSG_CHECKING([if x86/amd64 assembler supports 'lzcnt'])
+
+AC_TRY_COMPILE([], [
+  do { 		 
+      __asm__ __volatile__("lzcnt %rax,%rax");
+  } while (0)
+],
+[
+  ac_have_as_lzcnt=yes
+  AC_MSG_RESULT([yes])
+], [
+  ac_have_as_lzcnt=no
+  AC_MSG_RESULT([no])
+])
+
+AM_CONDITIONAL([BUILD_LZCNT_TESTS], [test x$ac_have_as_lzcnt = xyes])
+
+
 # Check for TLS support in the compiler and linker
 if test "x${cross_compiling}" = "xno"; then
 # Native compilation: check whether running a program using TLS succeeds.
diff --git a/none/tests/amd64/Makefile.am b/none/tests/amd64/Makefile.am
index 38e1ebbc35..bd1c8a7120 100644
--- a/none/tests/amd64/Makefile.am
+++ b/none/tests/amd64/Makefile.am
@@ -60,7 +60,6 @@ check_PROGRAMS = \
 	bug127521-64 bug132813-amd64 bug132918 \
 	clc \
 	$(INSN_TESTS) \
-	lzcnt64 \
 	rcl-amd64 \
 	redundantRexW \
 	smc1 \
@@ -69,6 +68,9 @@ check_PROGRAMS = \
 if BUILD_SSSE3_TESTS
  check_PROGRAMS += ssse3_misaligned
 endif
+if BUILD_LZCNT_TESTS
+ check_PROGRAMS += lzcnt64
+endif
 
 # DDD: these need to be made to work on Darwin like the x86/ ones were.
 if ! VGCONF_OS_IS_DARWIN
diff --git a/none/tests/x86/Makefile.am b/none/tests/x86/Makefile.am
index c0f0c08ae1..0fa2194c2e 100644
--- a/none/tests/x86/Makefile.am
+++ b/none/tests/x86/Makefile.am
@@ -84,7 +84,6 @@ check_PROGRAMS = \
 	jcxz \
 	lahf \
 	looper \
-	lzcnt32 \
 	movx \
 	pushpopseg \
 	sbbmisc \
@@ -95,6 +94,9 @@ check_PROGRAMS = \
 if BUILD_SSSE3_TESTS
    check_PROGRAMS += ssse3_misaligned
 endif
+if BUILD_LZCNT_TESTS
+ check_PROGRAMS += lzcnt32
+endif
 
 
 AM_CFLAGS    += @FLAG_M32@ $(FLAG_MMMX) $(FLAG_MSSE)