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1; RUN: llc < %s -march=x86-64 -mtriple=x86_64-linux-gnu -relocation-model=pic | FileCheck  %s
2
3@x = internal thread_local global i32 0, align 4
4@y = internal thread_local global i32 0, align 4
5
6; get_x and get_y are here to prevent x and y to be optimized away as 0
7
8define i32* @get_x() {
9entry:
10  ret i32* @x
11; FIXME: This function uses a single thread-local variable,
12; so we might want to fall back to general-dynamic here.
13; CHECK-LABEL:       get_x:
14; CHECK:       leaq x@TLSLD(%rip), %rdi
15; CHECK-NEXT:  callq __tls_get_addr@PLT
16; CHECK:       x@DTPOFF
17}
18
19define i32* @get_y() {
20entry:
21  ret i32* @y
22}
23
24define i32 @f(i32 %i) {
25entry:
26  %cmp = icmp eq i32 %i, 1
27  br i1 %cmp, label %return, label %if.else
28; This bb does not access TLS, so should not call __tls_get_addr.
29; CHECK-LABEL:       f:
30; CHECK-NOT:   __tls_get_addr
31; CHECK:       je
32
33
34if.else:
35  %0 = load i32, i32* @x, align 4
36  %cmp1 = icmp eq i32 %i, 2
37  br i1 %cmp1, label %if.then2, label %return
38; Now we call __tls_get_addr.
39; CHECK:       # %if.else
40; CHECK:       leaq x@TLSLD(%rip), %rdi
41; CHECK-NEXT:  callq __tls_get_addr@PLT
42; CHECK:       x@DTPOFF
43
44
45if.then2:
46  %1 = load i32, i32* @y, align 4
47  %add = add nsw i32 %1, %0
48  br label %return
49; This accesses TLS, but is dominated by the previous block,
50; so should not have to call __tls_get_addr again.
51; CHECK:       # %if.then2
52; CHECK-NOT:   __tls_get_addr
53; CHECK:       y@DTPOFF
54
55
56return:
57  %retval.0 = phi i32 [ %add, %if.then2 ], [ 5, %entry ], [ %0, %if.else ]
58  ret i32 %retval.0
59}
60