1 ; RUN: opt -S -instcombine < %s | FileCheck %s 2 3 ; Instcombine should preserve metadata and alignment while 4 ; folding a bitcast into a store. 5 6 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" 7 8 %struct.A = type { i32 (...)** } 9 10 @G = external constant [5 x i8*] 11 12 ; CHECK-LABEL: @foo 13 ; CHECK: store i32 (...)** bitcast (i8** getelementptr inbounds ([5 x i8*]* @G, i64 0, i64 2) to i32 (...)**), i32 (...)*** %0, align 16, !tag !0 14 define void @foo(%struct.A* %a) nounwind { 15 entry: 16 %0 = bitcast %struct.A* %a to i8*** 17 store i8** getelementptr inbounds ([5 x i8*]* @G, i64 0, i64 2), i8*** %0, align 16, !tag !0 18 ret void 19 } 20 21 ; Check instcombine doesn't try and fold the following bitcast into the store. 22 ; This transformation would not be safe since we would need to use addrspacecast 23 ; and addrspacecast is not guaranteed to be a no-op cast. 24 25 ; CHECK-LABEL: @bar 26 ; CHECK: %cast = bitcast i8** %b to i8 addrspace(1)** 27 ; CHECK: store i8 addrspace(1)* %a, i8 addrspace(1)** %cast 28 define void @bar(i8 addrspace(1)* %a, i8** %b) nounwind { 29 entry: 30 %cast = bitcast i8** %b to i8 addrspace(1)** 31 store i8 addrspace(1)* %a, i8 addrspace(1)** %cast 32 ret void 33 } 34 35 !0 = metadata !{metadata !"hello"} 36
