1 ; RUN: opt < %s -S -loop-unroll -unroll-threshold=150 | FileCheck %s 2 ; 3 ; Verify that trunc i64 to i32 is considered free by loop unrolling 4 ; heuristics when i32 is a native type. 5 ; This should result in full unrolling this loop with size=7, TC=19. 6 ; If the trunc were not free we would have 8*19=152 > 150. 7 8 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" 9 10 ; Check that for.body was unrolled 19 times. 11 ; CHECK: @test 12 ; CHECK: %0 = load 13 ; CHECK: %conv = sext i8 %0 to i32 14 ; CHECK: %add.1 = add nsw i32 %conv.1, %conv 15 ; CHECK: %add.18 = add nsw i32 %conv.18, %add.17 16 ; CHECK: ret i32 %add.18 17 define i32 @test(i8* %arr) nounwind uwtable readnone { 18 entry: 19 br label %for.body 20 21 for.body: ; preds = %for.body, %entry 22 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 23 %sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ] 24 %arrayidx = getelementptr inbounds i8* %arr, i64 %indvars.iv 25 %0 = load i8* %arrayidx, align 1 26 %conv = sext i8 %0 to i32 27 %add = add nsw i32 %conv, %sum.02 28 %indvars.iv.next = add i64 %indvars.iv, 1 29 %lftr.wideiv1 = trunc i64 %indvars.iv.next to i32 30 %exitcond2 = icmp eq i32 %lftr.wideiv1, 19 31 br i1 %exitcond2, label %for.end, label %for.body 32 33 for.end: ; preds = %for.body 34 %add.lcssa = phi i32 [ %add, %for.body ] 35 ret i32 %add.lcssa 36 } 37
