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