1 ; RUN: opt -O3 -S -analyze -scalar-evolution < %s | FileCheck %s 2 ; 3 ; This file contains phase ordering tests for scalar evolution. 4 ; Test that the standard passes don't obfuscate the IR so scalar evolution can't 5 ; recognize expressions. 6 7 ; CHECK: test1 8 ; The loop body contains two increments by %div. 9 ; Make sure that 2*%div is recognizable, and not expressed as a bit mask of %d. 10 ; CHECK: --> {%p,+,(8 * (%d /u 4))} 11 define void @test1(i64 %d, i32* %p) nounwind uwtable ssp { 12 entry: 13 %div = udiv i64 %d, 4 14 br label %for.cond 15 16 for.cond: ; preds = %for.inc, %entry 17 %p.addr.0 = phi i32* [ %p, %entry ], [ %add.ptr1, %for.inc ] 18 %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] 19 %cmp = icmp ne i32 %i.0, 64 20 br i1 %cmp, label %for.body, label %for.end 21 22 for.body: ; preds = %for.cond 23 store i32 0, i32* %p.addr.0, align 4 24 %add.ptr = getelementptr inbounds i32, i32* %p.addr.0, i64 %div 25 store i32 1, i32* %add.ptr, align 4 26 %add.ptr1 = getelementptr inbounds i32, i32* %add.ptr, i64 %div 27 br label %for.inc 28 29 for.inc: ; preds = %for.body 30 %inc = add i32 %i.0, 1 31 br label %for.cond 32 33 for.end: ; preds = %for.cond 34 ret void 35 } 36 37 ; CHECK: test1a 38 ; Same thing as test1, but it is even more tempting to fold 2 * (%d /u 2) 39 ; CHECK: --> {%p,+,(8 * (%d /u 2))} 40 define void @test1a(i64 %d, i32* %p) nounwind uwtable ssp { 41 entry: 42 %div = udiv i64 %d, 2 43 br label %for.cond 44 45 for.cond: ; preds = %for.inc, %entry 46 %p.addr.0 = phi i32* [ %p, %entry ], [ %add.ptr1, %for.inc ] 47 %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] 48 %cmp = icmp ne i32 %i.0, 64 49 br i1 %cmp, label %for.body, label %for.end 50 51 for.body: ; preds = %for.cond 52 store i32 0, i32* %p.addr.0, align 4 53 %add.ptr = getelementptr inbounds i32, i32* %p.addr.0, i64 %div 54 store i32 1, i32* %add.ptr, align 4 55 %add.ptr1 = getelementptr inbounds i32, i32* %add.ptr, i64 %div 56 br label %for.inc 57 58 for.inc: ; preds = %for.body 59 %inc = add i32 %i.0, 1 60 br label %for.cond 61 62 for.end: ; preds = %for.cond 63 ret void 64 } 65
