[Bug target/115875] -Oz optimization of "push IMM; pop REG" is used incorrectly for 64-bit constants with 31th bit set

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115875

--- Comment #2 from Denis Vlasenko <vda.linux at googlemail dot com> ---


0x00000000ffffffffUL works, although it uses

b8 ff ff ff ff          mov    $0xffffffff,%eax

instead of

83 c8 ff                or     $0xffffffff,%eax