1; RUN: opt < %s -basicaa -tailcallelim -inline -instcombine -dse -S | FileCheck %s 2; RUN: opt < %s -aa-pipeline=basic-aa -passes='function(tailcallelim),cgscc(inline,function(instcombine,dse))' -S | FileCheck %s 3; PR7272 4 5; Calls that capture byval parameters cannot be marked as tail calls. Other 6; tails that don't capture byval parameters can still be tail calls. 7 8target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32" 9target triple = "i386-pc-linux-gnu" 10 11declare void @ext(i32*) 12 13define void @bar(i32* byval %x) { 14 call void @ext(i32* %x) 15 ret void 16} 17 18define void @foo(i32* %x) { 19; CHECK-LABEL: define void @foo( 20; CHECK: llvm.lifetime.start 21; CHECK: store i32 %2, i32* %x 22 call void @bar(i32* byval %x) 23 ret void 24} 25 26define internal void @qux(i32* byval %x) { 27 call void @ext(i32* %x) 28 tail call void @ext(i32* null) 29 ret void 30} 31 32define void @frob(i32* %x) { 33; CHECK-LABEL: define void @frob( 34; CHECK: %[[POS:.*]] = alloca i32 35; CHECK: %[[VAL:.*]] = load i32, i32* %x 36; CHECK: store i32 %[[VAL]], i32* %[[POS]] 37; CHECK: {{^ *}}call void @ext(i32* nonnull %[[POS]] 38; CHECK: tail call void @ext(i32* null) 39; CHECK: ret void 40 tail call void @qux(i32* byval %x) 41 ret void 42} 43