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