1 ; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s 2 3 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-S128" 4 target triple = "x86_64-apple-macosx10.8.0" 5 6 @a = common global [2048 x i32] zeroinitializer, align 16 7 8 ; This is the loop. 9 ; for (i=0; i<n; i++){ 10 ; a[i] += i; 11 ; } 12 ;CHECK-LABEL: @inc( 13 ;CHECK: load <4 x i32> 14 ;CHECK: add nsw <4 x i32> 15 ;CHECK: store <4 x i32> 16 ;CHECK: ret void 17 define void @inc(i32 %n) nounwind uwtable noinline ssp { 18 %1 = icmp sgt i32 %n, 0 19 br i1 %1, label %.lr.ph, label %._crit_edge 20 21 .lr.ph: ; preds = %0, %.lr.ph 22 %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ] 23 %2 = getelementptr inbounds [2048 x i32]* @a, i64 0, i64 %indvars.iv 24 %3 = load i32* %2, align 4 25 %4 = trunc i64 %indvars.iv to i32 26 %5 = add nsw i32 %3, %4 27 store i32 %5, i32* %2, align 4 28 %indvars.iv.next = add i64 %indvars.iv, 1 29 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 30 %exitcond = icmp eq i32 %lftr.wideiv, %n 31 br i1 %exitcond, label %._crit_edge, label %.lr.ph 32 33 ._crit_edge: ; preds = %.lr.ph, %0 34 ret void 35 } 36 37 ; Can't vectorize this loop because the access to A[X] is non linear. 38 ; 39 ; for (i = 0; i < n; ++i) { 40 ; A[B[i]]++; 41 ; 42 ;CHECK-LABEL: @histogram( 43 ;CHECK-NOT: <4 x i32> 44 ;CHECK: ret i32 45 define i32 @histogram(i32* nocapture noalias %A, i32* nocapture noalias %B, i32 %n) nounwind uwtable ssp { 46 entry: 47 %cmp6 = icmp sgt i32 %n, 0 48 br i1 %cmp6, label %for.body, label %for.end 49 50 for.body: ; preds = %entry, %for.body 51 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 52 %arrayidx = getelementptr inbounds i32* %B, i64 %indvars.iv 53 %0 = load i32* %arrayidx, align 4 54 %idxprom1 = sext i32 %0 to i64 55 %arrayidx2 = getelementptr inbounds i32* %A, i64 %idxprom1 56 %1 = load i32* %arrayidx2, align 4 57 %inc = add nsw i32 %1, 1 58 store i32 %inc, i32* %arrayidx2, align 4 59 %indvars.iv.next = add i64 %indvars.iv, 1 60 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 61 %exitcond = icmp eq i32 %lftr.wideiv, %n 62 br i1 %exitcond, label %for.end, label %for.body 63 64 for.end: ; preds = %for.body, %entry 65 ret i32 0 66 } 67
