libstdc++: Resolve -Wunused-variable warnings in stdx::simd and tests

Signed-off-by: Matthias Kretz <m.kretz@gsi.de>

libstdc++-v3/ChangeLog:

	* include/experimental/bits/simd_builtin.h (_S_fpclassify): Move
	__infn into #ifdef'ed block.
	* testsuite/experimental/simd/tests/fpclassify.cc: Declare
	constants only when used.
	* testsuite/experimental/simd/tests/frexp.cc: Likewise.
	* testsuite/experimental/simd/tests/logarithm.cc: Likewise.
	* testsuite/experimental/simd/tests/trunc_ceil_floor.cc:
	Likewise.
	* testsuite/experimental/simd/tests/ldexp_scalbn_scalbln_modf.cc:
	Move totest and expect1 into #ifdef'ed block.

(cherry picked from commit a7129e82bed1bd4f513fc3c3f401721e2c96a865)

6 files changed, 17 insertions, 5 deletions

diff --git a/libstdc++-v3/include/experimental/bits/simd_builtin.h b/libstdc++-v3/include/experimental/bits/simd_builtin.h
index b1ae804bf91..712b3599a99 100644
--- a/libstdc++-v3/include/experimental/bits/simd_builtin.h
+++ b/libstdc++-v3/include/experimental/bits/simd_builtin.h
@@ -2356,12 +2356,12 @@ template <typename _Abi>
 	constexpr size_t _NI = sizeof(__xn) / sizeof(_I);
 	_GLIBCXX_SIMD_USE_CONSTEXPR auto __minn
 	  = __vector_bitcast<_I>(__vector_broadcast<_NI>(__norm_min_v<_Tp>));
-	_GLIBCXX_SIMD_USE_CONSTEXPR auto __infn
-	  = __vector_bitcast<_I>(__vector_broadcast<_NI>(__infinity_v<_Tp>));
 
 	_GLIBCXX_SIMD_USE_CONSTEXPR auto __fp_normal
 	  = __vector_broadcast<_NI, _I>(FP_NORMAL);
 #if !__FINITE_MATH_ONLY__
+	_GLIBCXX_SIMD_USE_CONSTEXPR auto __infn
+	  = __vector_bitcast<_I>(__vector_broadcast<_NI>(__infinity_v<_Tp>));
 	_GLIBCXX_SIMD_USE_CONSTEXPR auto __fp_nan
 	  = __vector_broadcast<_NI, _I>(FP_NAN);
 	_GLIBCXX_SIMD_USE_CONSTEXPR auto __fp_infinite
diff --git a/libstdc++-v3/testsuite/experimental/simd/tests/fpclassify.cc b/libstdc++-v3/testsuite/experimental/simd/tests/fpclassify.cc
index fe8a06174b1..30888c28c39 100644
--- a/libstdc++-v3/testsuite/experimental/simd/tests/fpclassify.cc
+++ b/libstdc++-v3/testsuite/experimental/simd/tests/fpclassify.cc
@@ -40,9 +40,11 @@ template <typename V>
   {
     using T = typename V::value_type;
     using intv = std::experimental::fixed_size_simd<int, V::size()>;
+#if __GCC_IEC_559 >= 2
     constexpr T inf = std::__infinity_v<T>;
     constexpr T denorm_min = std::__infinity_v<T>;
     constexpr T nan = std::__quiet_NaN_v<T>;
+#endif
     constexpr T max = std::__finite_max_v<T>;
     constexpr T norm_min = std::__norm_min_v<T>;
     test_values<V>(
diff --git a/libstdc++-v3/testsuite/experimental/simd/tests/frexp.cc b/libstdc++-v3/testsuite/experimental/simd/tests/frexp.cc
index 918182d2221..0d895c4913e 100644
--- a/libstdc++-v3/testsuite/experimental/simd/tests/frexp.cc
+++ b/libstdc++-v3/testsuite/experimental/simd/tests/frexp.cc
@@ -27,11 +27,17 @@ template <typename V>
   {
     using int_v = std::experimental::fixed_size_simd<int, V::size()>;
     using T = typename V::value_type;
+#if __GCC_IEC_559 >= 2 || defined __STDC_IEC_559__
     constexpr auto denorm_min = std::__denorm_min_v<T>;
+#endif
+#if __GCC_IEC_559 >= 2
     constexpr auto norm_min = std::__norm_min_v<T>;
+#endif
     constexpr auto max = std::__finite_max_v<T>;
+#if defined __STDC_IEC_559__
     constexpr auto nan = std::__quiet_NaN_v<T>;
     constexpr auto inf = std::__infinity_v<T>;
+#endif
     test_values<V>(
       {0, 0.25, 0.5, 1, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
        20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 31, -0., -0.25, -0.5, -1,
diff --git a/libstdc++-v3/testsuite/experimental/simd/tests/ldexp_scalbn_scalbln_modf.cc b/libstdc++-v3/testsuite/experimental/simd/tests/ldexp_scalbn_scalbln_modf.cc
index e9719cc67fe..3c4f0c80361 100644
--- a/libstdc++-v3/testsuite/experimental/simd/tests/ldexp_scalbn_scalbln_modf.cc
+++ b/libstdc++-v3/testsuite/experimental/simd/tests/ldexp_scalbn_scalbln_modf.cc
@@ -139,7 +139,6 @@ template <typename V>
 	if (modf_is_broken)
 	  return;
 	V integral = {};
-	const V totest = modf(input, &integral);
 	auto&& expected = [&](const auto& v) -> std::pair<const V, const V> {
 	  std::pair<V, V> tmp = {};
 	  using std::modf;
@@ -151,8 +150,9 @@ template <typename V>
 	    }
 	  return tmp;
 	};
-	const auto expect1 = expected(input);
 #ifdef __STDC_IEC_559__
+	const V totest = modf(input, &integral);
+	const auto expect1 = expected(input);
 	COMPARE(isnan(totest), isnan(expect1.first))
 	  << "modf(" << input << ", iptr) = " << totest << " != " << expect1;
 	COMPARE(isnan(integral), isnan(expect1.second))
diff --git a/libstdc++-v3/testsuite/experimental/simd/tests/logarithm.cc b/libstdc++-v3/testsuite/experimental/simd/tests/logarithm.cc
index b0dc9af6c81..d2e52646a7d 100644
--- a/libstdc++-v3/testsuite/experimental/simd/tests/logarithm.cc
+++ b/libstdc++-v3/testsuite/experimental/simd/tests/logarithm.cc
@@ -30,11 +30,13 @@ template <typename V>
     vir::test::setFuzzyness<double>(1);
 
     using T = typename V::value_type;
+#ifdef __STDC_IEC_559__
     constexpr T nan = std::__quiet_NaN_v<T>;
     constexpr T inf = std::__infinity_v<T>;
     constexpr T denorm_min = std::__denorm_min_v<T>;
-    constexpr T norm_min = std::__norm_min_v<T>;
     constexpr T min = std::__finite_min_v<T>;
+#endif
+    constexpr T norm_min = std::__norm_min_v<T>;
     constexpr T max = std::__finite_max_v<T>;
     test_values<V>({1,
 		    2,
diff --git a/libstdc++-v3/testsuite/experimental/simd/tests/trunc_ceil_floor.cc b/libstdc++-v3/testsuite/experimental/simd/tests/trunc_ceil_floor.cc
index 0687662fae6..71ac01a3d99 100644
--- a/libstdc++-v3/testsuite/experimental/simd/tests/trunc_ceil_floor.cc
+++ b/libstdc++-v3/testsuite/experimental/simd/tests/trunc_ceil_floor.cc
@@ -25,8 +25,10 @@ template <typename V>
   test()
   {
     using T = typename V::value_type;
+#ifdef __STDC_IEC_559__
     constexpr T inf = std::__infinity_v<T>;
     constexpr T denorm_min = std::__denorm_min_v<T>;
+#endif
     constexpr T norm_min = std::__norm_min_v<T>;
     constexpr T max = std::__finite_max_v<T>;
     constexpr T min = std::__finite_min_v<T>;