| ; RUN: opt < %s -sccp -loop-deletion -simplifycfg -S | FileCheck %s |
| |
| declare double @sqrt(double) readnone nounwind |
| %empty = type {} |
| declare %empty @has_side_effects() |
| |
| define double @test_0(i32 %param) { |
| ; CHECK-LABEL: @test_0( |
| ; CHECK-NOT: br |
| entry: |
| ; No matter how hard you try, sqrt(1.0) is always 1.0. This allows the |
| ; optimizer to delete this loop. |
| |
| 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 |
| } |
| |
| define i32 @test_1() { |
| ; CHECK-LABEL: @test_1( |
| ; CHECK: call %empty @has_side_effects() |
| %1 = call %empty @has_side_effects() |
| ret i32 0 |
| } |
