1 ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s 2 3 ; ScalarEvolution should be able to understand the loop and eliminate the casts. 4 5 target datalayout = "e-p:32:32:32-p1:16:16:16-p2:8:8:8-p4:64:64:64-n16:32:64" 6 7 ; CHECK: {%d,+,4}<%bb> Exits: ((4 * (trunc i32 (-1 + %n) to i16)) + %d) 8 9 10 define void @foo(i32 addrspace(1)* nocapture %d, i32 %n) nounwind { 11 ; CHECK: @foo 12 entry: 13 %0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1] 14 br i1 %0, label %bb.nph, label %return 15 16 bb.nph: ; preds = %entry 17 br label %bb 18 19 bb: ; preds = %bb1, %bb.nph 20 %i.02 = phi i32 [ %5, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=2] 21 %p.01 = phi i8 [ %4, %bb1 ], [ -1, %bb.nph ] ; <i8> [#uses=2] 22 %1 = sext i8 %p.01 to i32 ; <i32> [#uses=1] 23 %2 = sext i32 %i.02 to i64 ; <i64> [#uses=1] 24 %3 = getelementptr i32 addrspace(1)* %d, i64 %2 ; <i32*> [#uses=1] 25 store i32 %1, i32 addrspace(1)* %3, align 4 26 %4 = add i8 %p.01, 1 ; <i8> [#uses=1] 27 %5 = add i32 %i.02, 1 ; <i32> [#uses=2] 28 br label %bb1 29 30 bb1: ; preds = %bb 31 %6 = icmp slt i32 %5, %n ; <i1> [#uses=1] 32 br i1 %6, label %bb, label %bb1.return_crit_edge 33 34 bb1.return_crit_edge: ; preds = %bb1 35 br label %return 36 37 return: ; preds = %bb1.return_crit_edge, %entry 38 ret void 39 } 40 41 define void @test(i8 addrspace(1)* %a, i32 %n) nounwind { 42 ; CHECK: @test 43 entry: 44 %cmp1 = icmp sgt i32 %n, 0 45 br i1 %cmp1, label %for.body.lr.ph, label %for.end 46 47 for.body.lr.ph: ; preds = %entry 48 %tmp = zext i32 %n to i64 49 br label %for.body 50 51 for.body: ; preds = %for.body, %for.body.lr.ph 52 %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %for.body.lr.ph ] 53 %arrayidx = getelementptr i8 addrspace(1)* %a, i64 %indvar 54 store i8 0, i8 addrspace(1)* %arrayidx, align 1 55 %indvar.next = add i64 %indvar, 1 56 %exitcond = icmp ne i64 %indvar.next, %tmp 57 br i1 %exitcond, label %for.body, label %for.cond.for.end_crit_edge 58 59 for.cond.for.end_crit_edge: ; preds = %for.body 60 br label %for.end 61 62 for.end: ; preds = %for.cond.for.end_crit_edge, %entry 63 ret void 64 } 65 66 ; CHECK: Determining loop execution counts for: @test 67 ; CHECK-NEXT: backedge-taken count is 68 ; CHECK-NEXT: max backedge-taken count is -1 69
