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; RUN: opt < %s -sccp -loop-deletion -simplifycfg -S | FileCheck %s
declare double @sqrt(double) readnone nounwind
%empty = type {}
declare %empty @has_side_effects()
define double @test_0(i32 %param) {
; CHECK-LABEL: @test_0(
; CHECK-NOT: br
entry:
; No matter how hard you try, sqrt(1.0) is always 1.0. This allows the
; optimizer to delete this loop.
br label %Loop
Loop: ; preds = %Loop, %entry
%I2 = phi i32 [ 0, %entry ], [ %I3, %Loop ] ; <i32> [#uses=1]
%V = phi double [ 1.000000e+00, %entry ], [ %V2, %Loop ] ; <double> [#uses=2]
%V2 = call double @sqrt( double %V ) ; <double> [#uses=1]
%I3 = add i32 %I2, 1 ; <i32> [#uses=2]
%tmp.7 = icmp ne i32 %I3, %param ; <i1> [#uses=1]
br i1 %tmp.7, label %Loop, label %Exit
Exit: ; preds = %Loop
ret double %V
}
define i32 @test_1() {
; CHECK-LABEL: @test_1(
; CHECK: call %empty @has_side_effects()
%1 = call %empty @has_side_effects()
ret i32 0
}
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