xref: /aosp_15_r20/external/llvm/test/Transforms/InstCombine/phi-select-constexpr.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58) 
1*9880d681SAndroid Build Coastguard Worker; RUN: opt < %s -S -instcombine | FileCheck %s
2*9880d681SAndroid Build Coastguard Worker@A = extern_weak global i32, align 4
3*9880d681SAndroid Build Coastguard Worker@B = extern_weak global i32, align 4
4*9880d681SAndroid Build Coastguard Worker
5*9880d681SAndroid Build Coastguard Workerdefine i32 @foo(i1 %which) {
6*9880d681SAndroid Build Coastguard Workerentry:
7*9880d681SAndroid Build Coastguard Worker  br i1 %which, label %final, label %delay
8*9880d681SAndroid Build Coastguard Worker
9*9880d681SAndroid Build Coastguard Workerdelay:
10*9880d681SAndroid Build Coastguard Worker  br label %final
11*9880d681SAndroid Build Coastguard Worker
12*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: final:
13*9880d681SAndroid Build Coastguard Worker; CHECK: phi i32 [ 1, %entry ], [ select (i1 icmp eq (i32* @A, i32* @B), i32 2, i32 1), %delay ]
14*9880d681SAndroid Build Coastguard Workerfinal:
15*9880d681SAndroid Build Coastguard Worker  %use2 = phi i1 [ false, %entry ], [ icmp eq (i32* @A, i32* @B), %delay ]
16*9880d681SAndroid Build Coastguard Worker  %value = select i1 %use2, i32 2, i32 1
17*9880d681SAndroid Build Coastguard Worker  ret i32 %value
18*9880d681SAndroid Build Coastguard Worker}
19*9880d681SAndroid Build Coastguard Worker
20