1 ; RUN: opt < %s -instcombine -globals-aa -licm -S | FileCheck %s 2 3 ; Make sure -globals-aa ignores dead uses of globals. 4 5 @a = internal global i32 0, align 4 6 @c = common global i32 0, align 4 7 8 ; Function Attrs: nounwind 9 define i32 @g() { 10 ; Make sure the load of @a is hoisted. 11 ; CHECK-LABEL: define i32 @g() 12 ; CHECK: entry: 13 ; CHECK-NEXT: load i32, i32* @a, align 4 14 ; CHECK-NEXT: br label %for.cond 15 entry: 16 br label %for.cond 17 18 for.cond: ; preds = %for.inc, %entry 19 %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] 20 %sum.0 = phi i32 [ 0, %entry ], [ %add, %for.inc ] 21 %cmp = icmp slt i32 %i.0, 1000 22 br i1 %cmp, label %for.body, label %for.end 23 24 for.body: ; preds = %for.cond 25 %0 = load i32, i32* @a, align 4 26 %add = add nsw i32 %sum.0, %0 27 call void @f() 28 br label %for.inc 29 30 for.inc: ; preds = %for.body 31 %inc = add nsw i32 %i.0, 1 32 br label %for.cond 33 34 for.end: ; preds = %for.cond 35 ret i32 %sum.0 36 } 37 38 ; Function Attrs: nounwind 39 define internal void @f() { 40 entry: 41 %tobool = icmp ne i32 0, 0 42 br i1 %tobool, label %if.then, label %if.end 43 44 if.then: ; preds = %entry 45 store i32 ptrtoint (i32* @a to i32), i32* @c, align 4 46 br label %if.end 47 48 if.end: ; preds = %if.then, %entry 49 %0 = load i32, i32* @c, align 4 50 %inc = add nsw i32 %0, 1 51 store i32 %inc, i32* @c, align 4 52 ret void 53 } 54 55
