[gcc r12-10079] libstdc++: testsuite: Reduce max_size_type.cc exec time [PR113175]

[gcc r12-10079] libstdc++: testsuite: Reduce max_size_type.cc exec time [PR113175]

[Patrick Palka]

https://gcc.gnu.org/g:1fb2b5c9a7fb212a5936cc702e49175ef988e5ad

commit r12-10079-g1fb2b5c9a7fb212a5936cc702e49175ef988e5ad
Author: Patrick Palka <ppalka@redhat.com>
Date:   Tue Jan 2 21:31:20 2024 -0500

    libstdc++: testsuite: Reduce max_size_type.cc exec time [PR113175]
    
    The adjustment to max_size_type.cc in r14-205-g83470a5cd4c3d2
    inadvertently increased the execution time of this test by over 5x due
    to making the two main loops actually run in the signed_p case instead
    of being dead code.
    
    To compensate, this patch cuts the relevant loops' range [-1000,1000] by
    10x as proposed in the PR.  This shouldn't significantly weaken the test
    since the same important edge cases are still checked in the smaller range
    and/or elsewhere.  On my machine this reduces the test's execution time by
    roughly 10x (and 1.6x relative to before r14-205).
    
            PR testsuite/113175
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/std/ranges/iota/max_size_type.cc (test02): Reduce
            'limit' to 100 from 1000 and adjust 'log2_limit' accordingly.
            (test03): Likewise.
    
    (cherry picked from commit a138b99646a5551c53b860648521adb5bfe8c2fa)

Diff:
---
 libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc b/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc
index 5fc798cc60d..5c41b5629b0 100644
--- a/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc
+++ b/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc
@@ -200,8 +200,8 @@ test02()
   using max_type = std::conditional_t<signed_p, max_diff_t, max_size_t>;
   using shorten_type = std::conditional_t<shorten_p, hw_type, max_type>;
   const int hw_type_bit_size = sizeof(hw_type) * __CHAR_BIT__;
-  const int limit = 1000;
-  const int log2_limit = 10;
+  const unsigned limit = 100;
+  const int log2_limit = 7;
   static_assert((1 << log2_limit) >= limit);
   const int min = (signed_p ? -limit : 0);
   const int max = limit;
@@ -258,8 +258,8 @@ test03()
   using max_type = std::conditional_t<signed_p, max_diff_t, max_size_t>;
   using base_type = std::conditional_t<toggle_base_p, hw_type, max_type>;
   constexpr int hw_type_bit_size = sizeof(hw_type) * __CHAR_BIT__;
-  constexpr int limit = 1000;
-  constexpr int log2_limit = 10;
+  constexpr unsigned limit = 100;
+  constexpr int log2_limit = 7;
   static_assert((1 << log2_limit) >= limit);
   const int min = (signed_p ? -limit : 0);
   const int max = limit;