1; RUN: opt -S -instcombine < %s | FileCheck %s
2
3; https://llvm.org/bugs/show_bug.cgi?id=25900
4; An arithmetic shift right of a power of two is not a power
5; of two if the original value is the sign bit. Therefore,
6; we can't transform the sdiv into a udiv.
7
8define i32 @pr25900(i32 %d) {
9  %and = and i32 %d, -2147483648
10; The next 3 lines prevent another fold from masking the bug.
11  %ext = zext i32 %and to i64
12  %or = or i64 %ext, 4294967296
13  %trunc = trunc i64 %or to i32
14  %ashr = ashr exact i32 %trunc, 31
15  %div = sdiv i32 4, %ashr
16  ret i32 %div
17
18; CHECK: sdiv
19}
20
21