Merging r261387:

[oota-llvm.git] / test / CodeGen / X86 / tls-shrink-wrapping.ll

diff --git a/test/CodeGen/X86/tls-shrink-wrapping.ll b/test/CodeGen/X86/tls-shrink-wrapping.ll
new file mode 100644 (file)
index 0000000..37c1754
--- /dev/null
+++ b/test/CodeGen/X86/tls-shrink-wrapping.ll
@@ -0,0 +1,60 @@
+; Testcase generated from the following code:
+; extern __thread int i;
+; void f();
+; int g(void) {
+;   if (i) {
+;     i = 0;
+;     f();
+;   }
+;   return i;
+; }
+; We want to make sure that TLS variables are not accessed before
+; the stack frame is set up.
+
+; RUN: llc < %s -relocation-model=pic | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-freebsd11.0"
+
+@i = external thread_local global i32, align 4
+
+define i32 @g() #0 {
+entry:
+  %tmp = load i32, i32* @i, align 4
+  %tobool = icmp eq i32 %tmp, 0
+  br i1 %tobool, label %if.end, label %if.then
+
+if.then:                                          ; preds = %entry
+  store i32 0, i32* @i, align 4
+  tail call void (...) @f() #2
+  %.pre = load i32, i32* @i, align 4
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  %tmp1 = phi i32 [ 0, %entry ], [ %.pre, %if.then ]
+  ret i32 %tmp1
+}
+
+; CHECK: g:                                      # @g
+; CHECK-NEXT:         .cfi_startproc
+; CHECK-NEXT: # BB#0:                                 # %entry
+; CHECK-NEXT:         pushq   %rbp
+; CHECK-NEXT: .Ltmp0:
+; CHECK-NEXT:         .cfi_def_cfa_offset 16
+; CHECK-NEXT: .Ltmp1:
+; CHECK-NEXT:         .cfi_offset %rbp, -16
+; CHECK-NEXT:         movq    %rsp, %rbp
+; CHECK-NEXT: .Ltmp2:
+; CHECK-NEXT:         .cfi_def_cfa_register %rbp
+; CHECK-NEXT:         pushq   %rbx
+; CHECK-NEXT:         pushq   %rax
+; CHECK-NEXT: .Ltmp3:
+; CHECK-NEXT:         .cfi_offset %rbx, -24
+; CHECK-NEXT:         data16
+; CHECK-NEXT:         leaq    i@TLSGD(%rip), %rdi
+
+declare void @f(...) #1
+
+attributes #0 = { nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind }