1; RUN: opt < %s -passes=gvn -S | FileCheck %s 2; RUN: opt < %s -passes="gvn<load-pre>" -S | FileCheck %s 3 4target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32" 5 6@p = external global i32 7 8define i32 @test(i32 %n) nounwind { 9; CHECK-LABEL: @test( 10entry: 11 br label %for.cond 12 13; loads aligned greater than the memory should not be moved past conditionals 14; CHECK-NOT: load 15; CHECK: br i1 16 17for.cond: 18 %i.0 = phi i32 [ 0, %entry ], [ %indvar.next, %for.inc ] 19 %cmp = icmp slt i32 %i.0, %n 20 br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge 21 22for.cond.for.end_crit_edge: 23; ...but PRE can still move the load out of for.end to here. 24; CHECK: for.cond.for.end_crit_edge: 25; CHECK-NEXT: load 26 br label %for.end 27 28for.body: 29 %tmp3 = load i32, ptr @p, align 8 30 %dec = add i32 %tmp3, -1 31 store i32 %dec, ptr @p 32 %cmp6 = icmp slt i32 %dec, 0 33 br i1 %cmp6, label %for.body.for.end_crit_edge, label %for.inc 34 35for.body.for.end_crit_edge: 36 br label %for.end 37 38for.inc: 39 %indvar.next = add i32 %i.0, 1 40 br label %for.cond 41 42for.end: 43 %tmp9 = load i32, ptr @p, align 8 44 ret i32 %tmp9 45} 46