1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=sccp,loop-deletion,simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s 3 4declare double @sqrt(double) readnone nounwind willreturn 5%empty = type {} 6declare %empty @has_side_effects() 7 8; No matter how hard you try, sqrt(1.0) is always 1.0. This allows the 9; optimizer to delete this loop. 10define double @test_0(i32 %param) { 11; CHECK-LABEL: @test_0( 12; CHECK-NEXT: entry: 13; CHECK-NEXT: ret double 1.000000e+00 14; 15entry: 16 br label %Loop 17Loop: ; preds = %Loop, %entry 18 %I2 = phi i32 [ 0, %entry ], [ %I3, %Loop ] 19 %V = phi double [ 1.000000e+00, %entry ], [ %V2, %Loop ] 20 %V2 = call double @sqrt( double %V ) 21 %I3 = add i32 %I2, 1 22 %tmp.7 = icmp ne i32 %I3, %param 23 br i1 %tmp.7, label %Loop, label %Exit 24Exit: ; preds = %Loop 25 ret double %V 26} 27 28define i32 @test_1() { 29; CHECK-LABEL: @test_1( 30; CHECK-NEXT: [[TMP1:%.*]] = call [[EMPTY:%.*]] @has_side_effects() 31; CHECK-NEXT: ret i32 0 32; 33 %1 = call %empty @has_side_effects() 34 ret i32 0 35} 36 37define i32 @test_not_willreturn() { 38; CHECK-LABEL: @test_not_willreturn( 39; CHECK-NEXT: [[TMP1:%.*]] = call [[EMPTY:%.*]] @has_side_effects() #[[ATTR1:[0-9]+]] 40; CHECK-NEXT: ret i32 0 41; 42 %1 = call %empty @has_side_effects() nounwind readonly 43 ret i32 0 44} 45