summaryrefslogtreecommitdiffstats
path: root/test/CodeGen/ARM/tail-call.ll
blob: ca19b057773a8a31f1efc4d751fa859ed94e76bd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
; RUN: llc -mtriple armv7 -target-abi apcs -O0 -o - < %s \
; RUN:   | FileCheck %s -check-prefix CHECK-TAIL
; RUN: llc -mtriple armv7 -target-abi apcs -O0 -disable-tail-calls -o - < %s \
; RUN:   | FileCheck %s -check-prefix CHECK-NO-TAIL

declare i32 @callee(i32 %i)
declare extern_weak fastcc void @callee_weak()

define i32 @caller(i32 %i) {
entry:
  %r = tail call i32 @callee(i32 %i)
  ret i32 %r
}

; CHECK-TAIL-LABEL: caller
; CHECK-TAIL: b callee

; CHECK-NO-TAIL-LABEL: caller
; CHECK-NO-TAIL: push {lr}
; CHECK-NO-TAIL: bl callee
; CHECK-NO-TAIL: pop {lr}
; CHECK-NO-TAIL: bx lr


; Weakly-referenced extern functions cannot be tail-called, as AAELF does
; not define the behaviour of branch instructions to undefined weak symbols.
define fastcc void @caller_weak() {
; CHECK-LABEL: caller_weak:
; CHECK: bl callee_weak
  tail call void @callee_weak()
  ret void
}