1; RUN: llc -mtriple=thumbv4t-linux-gnueabi -o - %s | FileCheck %s
2
3; Functions may have more features than the base triple; code generation and
4; instruction selection may be performed based on this information. This test
5; makes sure that the MC layer performs instruction relaxation based on the
6; target-features of the function. The relaxation for tail call is particularly
7; important on Thumb2 as the 16-bit Thumb branch instruction has an extremely
8; short range.
9
10declare dso_local void @g(...) local_unnamed_addr #2
11
12define dso_local void @f() local_unnamed_addr #0 {
13entry:
14  tail call void bitcast (void (...)* @g to void ()*)() #3
15  ret void
16}
17; Function has thumb2 target-feature, tail call is allowed and must be widened.
18; CHECK: f:
19; CHECK: b g
20
21define dso_local void @h() local_unnamed_addr #2 {
22entry:
23  tail call void bitcast (void (...)* @g to void ()*)() #3
24  ret void
25}
26; Function does not have thumb2 target-feature, tail call should not be
27; generated as it cannot be widened.
28; CHECK: h:
29; CHECK: bl g
30
31attributes #0 = { nounwind  "disable-tail-calls"="false" "target-cpu"="cortex-a53" "target-features"="+crypto,+fp-armv8,+neon,+soft-float-abi,+strict-align,+thumb-mode,-crc,-dotprod,-dsp,-hwdiv,-hwdiv-arm,-ras" "use-soft-float"="true" }
32
33attributes #2 = { nounwind  "disable-tail-calls"="false" "target-cpu"="arm7tdmi" "target-features"="+strict-align,+thumb-mode,-crc,-dotprod,-dsp,-hwdiv,-hwdiv-arm,-ras" "unsafe-fp-math"="false" "use-soft-float"="true" }
34attributes #3 = { nounwind }
35