1; RUN: opt < %s -sccp -loop-deletion -simplifycfg -S | FileCheck %s
2
3declare double @sqrt(double) readnone nounwind
4%empty = type {}
5declare %empty @has_side_effects()
6
7define double @test_0(i32 %param) {
8; CHECK-LABEL: @test_0(
9; CHECK-NOT: br
10entry:
11; No matter how hard you try, sqrt(1.0) is always 1.0.  This allows the
12; optimizer to delete this loop.
13
14	br label %Loop
15Loop:		; preds = %Loop, %entry
16	%I2 = phi i32 [ 0, %entry ], [ %I3, %Loop ]		; <i32> [#uses=1]
17	%V = phi double [ 1.000000e+00, %entry ], [ %V2, %Loop ]		; <double> [#uses=2]
18	%V2 = call double @sqrt( double %V )		; <double> [#uses=1]
19	%I3 = add i32 %I2, 1		; <i32> [#uses=2]
20	%tmp.7 = icmp ne i32 %I3, %param		; <i1> [#uses=1]
21	br i1 %tmp.7, label %Loop, label %Exit
22Exit:		; preds = %Loop
23	ret double %V
24}
25
26define i32 @test_1() {
27; CHECK-LABEL: @test_1(
28; CHECK: call %empty @has_side_effects()
29  %1 = call %empty @has_side_effects()
30  ret i32 0
31}
32