1 ; RUN: opt < %s -sccp -loop-deletion -simplifycfg -S | FileCheck %s 2 3 declare double @sqrt(double) readnone nounwind 4 %empty = type {} 5 declare %empty @has_side_effects() 6 7 define double @test_0(i32 %param) { 8 ; CHECK-LABEL: @test_0( 9 ; CHECK-NOT: br 10 entry: 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 15 Loop: ; 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 22 Exit: ; preds = %Loop 23 ret double %V 24 } 25 26 define 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
