Fix dfp tests.

Due to changes between the compiler and linker, we need to add .machine
arguments to configure file to properly detect the availability of the
dfp instructions.

Add print statement if HAS_DFP is not enabled to make it
easier to determine when HAS_DFP is not enabled.

configure.ac

@@ -1563,14 +1563,17 @@ AM_CONDITIONAL([HAS_VSX], [test x$ac_compiler_supports_vsx_flag = xyes \
                              -a x$HWCAP_HAS_VSX = xyes ])
 
 # DFP (Decimal Float)
+# The initial DFP support was added in Power 6.  The dcffix instruction
+# support was added in Power 7.
 AC_MSG_CHECKING([that assembler knows DFP])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 ]], [[
   #ifdef __s390__
   __asm__ __volatile__("adtr 1, 2, 3")
   #else
-  __asm__ __volatile__("dadd 1, 2, 3");
-  __asm__ __volatile__("dcffix 1, 2");
+__asm__ __volatile__(".machine power7;\n" \
+  "dadd 1, 2, 3;\n" \
+  "dcffix 1, 2");
   #endif
 ]])], [
 ac_asm_have_dfp=yes
@@ -1582,13 +1585,16 @@ AC_MSG_RESULT([no])
 AC_MSG_CHECKING([that compiler knows -mhard-dfp switch])
 safe_CFLAGS=$CFLAGS
 CFLAGS="-mhard-dfp -Werror"
+
+# The dcffix instruction is Power 7
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 ]], [[
   #ifdef __s390__
   __asm__ __volatile__("adtr 1, 2, 3")
   #else
-  __asm__ __volatile__("dadd 1, 2, 3");
-  __asm__ __volatile__("dcffix 1, 2");
+  __asm__ __volatile__(".machine power7;\n" \
+  "dadd 1, 2, 3;\n" \
+  "dcffix 1, 2");
   #endif
 ]])], [
 ac_compiler_have_dfp=yes

none/tests/ppc32/test_dfp1.c

@@ -497,6 +497,8 @@ int main() {
       i++;
    }
 
+#else
+   printf("HAS_DFP not detected.\n");
 #endif // HAS_DFP
    return 0;
 }

none/tests/ppc32/test_dfp2.c

@@ -668,6 +668,8 @@ int main(int argc, char ** argv, char ** envp) {
       i++;
    }
 
+#else
+   printf("HAS_DFP not detected.\n");
 #endif // HAS_DFP
    return 0;
 }

none/tests/ppc32/test_dfp3.c

@@ -1256,6 +1256,8 @@ int main() {
       i++;
    }
 
+#else
+   printf("HAS_DFP not detected.\n");
 #endif // HAS_DFP
    return 0;
 }

none/tests/ppc32/test_dfp4.c

@@ -636,6 +636,8 @@ int main() {
       i++;
    }
 
+#else
+   printf("HAS_DFP not detected.\n");
 #endif // HAS_DFP
    return 0;
 }

none/tests/ppc32/test_dfp5.c

@@ -605,6 +605,8 @@ int main() {
       i++;
    }
 
+#else
+   printf("HAS_DFP not detected.\n");
 #endif // HAS_DFP
    return 0;
 }

none/tests/ppc64/test_dfp1.vgtest

@@ -1,2 +1,2 @@
-prereq: ../../../tests/check_ppc64_auxv_cap dfp
+prereq: ../../../tests/check_ppc64_auxv_cap dfp && ../../../tests/check_ppc64_auxv_cap arch_2_06
 prog: test_dfp1

none/tests/ppc64/test_dfp2.vgtest

@@ -1,2 +1,2 @@
-prereq: ../../../tests/check_ppc64_auxv_cap dfp
+prereq: ../../../tests/check_ppc64_auxv_cap dfp && ../../../tests/check_ppc64_auxv_cap arch_2_06
 prog: test_dfp2

none/tests/ppc64/test_dfp3.vgtest

@@ -1,2 +1,2 @@
-prereq: ../../../tests/check_ppc64_auxv_cap dfp
+prereq: ../../../tests/check_ppc64_auxv_cap dfp && ../../../tests/check_ppc64_auxv_cap arch_2_06
 prog: test_dfp3

none/tests/ppc64/test_dfp4.vgtest

@@ -1,2 +1,2 @@
-prereq: ../../../tests/check_ppc64_auxv_cap dfp
+prereq: ../../../tests/check_ppc64_auxv_cap dfp && ../../../tests/check_ppc64_auxv_cap arch_2_06
 prog: test_dfp4

none/tests/ppc64/test_dfp5.vgtest

@@ -1,2 +1,2 @@
-prereq: ../../../tests/check_ppc64_auxv_cap dfp
+prereq: ../../../tests/check_ppc64_auxv_cap dfp && ../../../tests/check_ppc64_auxv_cap arch_2_06
 prog: test_dfp5