1 ; RUN: llvm-upgrade < %s | llvm-as | opt -simplifycfg -instcombine -mem2reg | llvm-dis | not grep alloca
3 ; This tests to see if mem2reg can promote alloca instructions whose addresses
4 ; are used by PHI nodes that are immediately loaded. The LLVM C++ front-end
5 ; often generates code that looks like this (when it codegen's ?: exprs as
6 ; lvalues), so handling this simple extension is quite useful.
8 ; This testcase is what the following program looks like when it reaches
11 ; template<typename T>
12 ; const T& max(const T& a1, const T& a2) { return a1 < a2 ? a1 : a2; }
13 ; int main() { return max(0, 1); }
15 ; This test checks to make sure the combination of instcombine and mem2reg
16 ; perform the transformation.
20 %mem_tmp.0 = alloca int
21 %mem_tmp.1 = alloca int
22 store int 0, int* %mem_tmp.0
23 store int 1, int* %mem_tmp.1
24 %tmp.1.i = load int* %mem_tmp.1
25 %tmp.3.i = load int* %mem_tmp.0
26 %tmp.4.i = setle int %tmp.1.i, %tmp.3.i
27 br bool %tmp.4.i, label %cond_true.i, label %cond_continue.i
30 br label %cond_continue.i
33 %mem_tmp.i.0 = phi int* [ %mem_tmp.1, %cond_true.i ], [ %mem_tmp.0, %entry ]
34 %tmp.3 = load int* %mem_tmp.i.0