1 ; RUN: opt < %s -sccp -loop-deletion -simplifycfg -S | not grep br 2 3 ; No matter how hard you try, sqrt(1.0) is always 1.0. This allows the 4 ; optimizer to delete this loop. 5 6 declare double @sqrt(double) 7 8 define double @test(i32 %param) { 9 entry: 10 br label %Loop 11 Loop: ; preds = %Loop, %entry 12 %I2 = phi i32 [ 0, %entry ], [ %I3, %Loop ] ; <i32> [#uses=1] 13 %V = phi double [ 1.000000e+00, %entry ], [ %V2, %Loop ] ; <double> [#uses=2] 14 %V2 = call double @sqrt( double %V ) ; <double> [#uses=1] 15 %I3 = add i32 %I2, 1 ; <i32> [#uses=2] 16 %tmp.7 = icmp ne i32 %I3, %param ; <i1> [#uses=1] 17 br i1 %tmp.7, label %Loop, label %Exit 18 Exit: ; preds = %Loop 19 ret double %V 20 } 21 22
