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- ; RUN: opt < %s -sccp -loop-deletion -simplifycfg -S | not grep br
- ; No matter how hard you try, sqrt(1.0) is always 1.0. This allows the
- ; optimizer to delete this loop.
- declare double @sqrt(double)
- define double @test(i32 %param) {
- entry:
- 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
- }
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