1 ; RUN: opt -O3 -S -analyze -scalar-evolution < %s | FileCheck %s 2 3 target datalayout = "e-m:m-p:40:64:64:32-i32:32-i16:16-i8:8-n32" 4 5 ; 6 ; This file contains phase ordering tests for scalar evolution. 7 ; Test that the standard passes don't obfuscate the IR so scalar evolution can't 8 ; recognize expressions. 9 10 ; CHECK: test1 11 ; The loop body contains two increments by %div. 12 ; Make sure that 2*%div is recognizable, and not expressed as a bit mask of %d. 13 ; CHECK: --> {%p,+,(8 * (%d /u 4))} 14 define void @test1(i32 %d, i32* %p) nounwind uwtable ssp { 15 entry: 16 %div = udiv i32 %d, 4 17 br label %for.cond 18 19 for.cond: ; preds = %for.inc, %entry 20 %p.addr.0 = phi i32* [ %p, %entry ], [ %add.ptr1, %for.inc ] 21 %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] 22 %cmp = icmp ne i32 %i.0, 64 23 br i1 %cmp, label %for.body, label %for.end 24 25 for.body: ; preds = %for.cond 26 store i32 0, i32* %p.addr.0, align 4 27 %add.ptr = getelementptr inbounds i32, i32* %p.addr.0, i32 %div 28 store i32 1, i32* %add.ptr, align 4 29 %add.ptr1 = getelementptr inbounds i32, i32* %add.ptr, i32 %div 30 br label %for.inc 31 32 for.inc: ; preds = %for.body 33 %inc = add i32 %i.0, 1 34 br label %for.cond 35 36 for.end: ; preds = %for.cond 37 ret void 38 } 39 40 ; CHECK: test1a 41 ; Same thing as test1, but it is even more tempting to fold 2 * (%d /u 2) 42 ; CHECK: --> {%p,+,(8 * (%d /u 2))} 43 define void @test1a(i32 %d, i32* %p) nounwind uwtable ssp { 44 entry: 45 %div = udiv i32 %d, 2 46 br label %for.cond 47 48 for.cond: ; preds = %for.inc, %entry 49 %p.addr.0 = phi i32* [ %p, %entry ], [ %add.ptr1, %for.inc ] 50 %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] 51 %cmp = icmp ne i32 %i.0, 64 52 br i1 %cmp, label %for.body, label %for.end 53 54 for.body: ; preds = %for.cond 55 store i32 0, i32* %p.addr.0, align 4 56 %add.ptr = getelementptr inbounds i32, i32* %p.addr.0, i32 %div 57 store i32 1, i32* %add.ptr, align 4 58 %add.ptr1 = getelementptr inbounds i32, i32* %add.ptr, i32 %div 59 br label %for.inc 60 61 for.inc: ; preds = %for.body 62 %inc = add i32 %i.0, 1 63 br label %for.cond 64 65 for.end: ; preds = %for.cond 66 ret void 67 } 68
