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 6target 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 %x, i32* %{{.*}}, align 16, !noalias !0, !llvm.access.group !1 14define void @foo(i32 %x, float* %p) nounwind { 15entry: 16 %x.cast = bitcast i32 %x to float 17 store float %x.cast, float* %p, align 16, !noalias !0, !llvm.access.group !1 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 28define void @bar(i8 addrspace(1)* %a, i8** %b) nounwind { 29entry: 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; Check that we don't combine the bitcast into the store. This would create a 36; bitcast of the swifterror which is invalid. 37 38; CHECK-LABEL; @swifterror_store 39; CHECK: bitcast i64 40; CHECK: store %swift.error 41 42%swift.error = type opaque 43define void @swifterror_store(i64* %x, %swift.error** swifterror %err) { 44entry: 45 %casted = bitcast i64* %x to %swift.error* 46 store %swift.error* %casted, %swift.error** %err 47 ret void 48} 49 50!0 = !{!0} 51!1 = !{}