[gcc r13-6301] libstdc++: Fix -Wsign-compare issue

[Matthias Kretz]

https://gcc.gnu.org/g:ffa39f7120f6e83a567d7a83ff4437f6b41036ea

commit r13-6301-gffa39f7120f6e83a567d7a83ff4437f6b41036ea
Author: Matthias Kretz <m.kretz@gsi.de>
Date:   Tue Feb 21 10:31:55 2023 +0100

    libstdc++: Fix -Wsign-compare issue
    
    Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
    
    libstdc++-v3/ChangeLog:
    
            * include/experimental/bits/simd_builtin.h (_S_set): Compare as
            int. The actual range of these indexes is very small.

Diff:
---
 libstdc++-v3/include/experimental/bits/simd_builtin.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/experimental/bits/simd_builtin.h b/libstdc++-v3/include/experimental/bits/simd_builtin.h
index 792439a81bf..9736db65e01 100644
--- a/libstdc++-v3/include/experimental/bits/simd_builtin.h
+++ b/libstdc++-v3/include/experimental/bits/simd_builtin.h
@@ -2870,7 +2870,7 @@ template <typename _Abi, typename>
 		__k = __generate_from_n_evaluations<_Np,
 						    __vector_type_t<_Tp, _Np>>(
 		  [&](auto __j) _GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA {
-		    if (__i == __j)
+		    if (__i == static_cast<int>(__j))
 		      return _Tp(-__x);
 		    else
 		      return __k[+__j];