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| ; RUN: opt < %s -basicaa -tailcallelim -inline -instcombine -dse -S | FileCheck %s
; RUN: opt < %s -aa-pipeline=basic-aa -passes='function(tailcallelim),cgscc(inline,function(instcombine,dse))' -S | FileCheck %s
; PR7272
; Calls that capture byval parameters cannot be marked as tail calls. Other
; tails that don't capture byval parameters can still be tail calls.
target 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"
target triple = "i386-pc-linux-gnu"
declare void @ext(i32*)
define void @bar(i32* byval %x) {
call void @ext(i32* %x)
ret void
}
define void @foo(i32* %x) {
; CHECK-LABEL: define void @foo(
; CHECK: llvm.lifetime.start
; CHECK: store i32 %2, i32* %x
call void @bar(i32* byval %x)
ret void
}
define internal void @qux(i32* byval %x) {
call void @ext(i32* %x)
tail call void @ext(i32* null)
ret void
}
define void @frob(i32* %x) {
; CHECK-LABEL: define void @frob(
; CHECK: %[[POS:.*]] = alloca i32
; CHECK: %[[VAL:.*]] = load i32, i32* %x
; CHECK: store i32 %[[VAL]], i32* %[[POS]]
; CHECK: {{^ *}}call void @ext(i32* nonnull %[[POS]]
; CHECK: tail call void @ext(i32* null)
; CHECK: ret void
tail call void @qux(i32* byval %x)
ret void
}
; A byval parameter passed into a function which is passed out as byval does
; not block the call from being marked as tail.
declare void @ext2(i32* byval)
define void @bar2(i32* byval %x) {
call void @ext2(i32* byval %x)
ret void
}
define void @foobar(i32* %x) {
; CHECK-LABEL: define void @foobar(
; CHECK: %[[POS:.*]] = alloca i32
; CHECK: %[[VAL:.*]] = load i32, i32* %x
; CHECK: store i32 %[[VAL]], i32* %[[POS]]
; CHECK: tail call void @ext2(i32* nonnull byval %[[POS]]
; CHECK: ret void
tail call void @bar2(i32* byval %x)
ret void
}
define void @barfoo() {
; CHECK-LABEL: define void @barfoo(
; CHECK: %[[POS:.*]] = alloca i32
; CHECK: %[[VAL:.*]] = load i32, i32* %x
; CHECK: store i32 %[[VAL]], i32* %[[POS]]
; CHECK: tail call void @ext2(i32* nonnull byval %[[POS]]
; CHECK: ret void
%x = alloca i32
tail call void @bar2(i32* byval %x)
ret void
}
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