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67 lines
2.3 KiB
LLVM
67 lines
2.3 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s
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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"
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target triple = "x86_64-apple-macosx10.8.0"
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@a = common global [2048 x i32] zeroinitializer, align 16
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; This is the loop.
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; for (i=0; i<n; i++){
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; a[i] += i;
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; }
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;CHECK: @inc
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;CHECK: load <4 x i32>
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;CHECK: add nsw <4 x i32>
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;CHECK: store <4 x i32>
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;CHECK: ret void
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define void @inc(i32 %n) nounwind uwtable noinline ssp {
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%1 = icmp sgt i32 %n, 0
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br i1 %1, label %.lr.ph, label %._crit_edge
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.lr.ph: ; preds = %0, %.lr.ph
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%indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
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%2 = getelementptr inbounds [2048 x i32]* @a, i64 0, i64 %indvars.iv
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%3 = load i32* %2, align 4
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%4 = trunc i64 %indvars.iv to i32
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%5 = add nsw i32 %3, %4
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store i32 %5, i32* %2, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %._crit_edge, label %.lr.ph
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._crit_edge: ; preds = %.lr.ph, %0
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ret void
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}
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; Can't vectorize this loop because the access to A[X] is non linear.
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;
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; for (i = 0; i < n; ++i) {
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; A[B[i]]++;
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;
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;CHECK: @histogram
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;CHECK-NOT: <4 x i32>
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;CHECK: ret i32
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define i32 @histogram(i32* nocapture noalias %A, i32* nocapture noalias %B, i32 %n) nounwind uwtable ssp {
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entry:
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%cmp6 = icmp sgt i32 %n, 0
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br i1 %cmp6, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32* %B, i64 %indvars.iv
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%0 = load i32* %arrayidx, align 4
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%idxprom1 = sext i32 %0 to i64
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%arrayidx2 = getelementptr inbounds i32* %A, i64 %idxprom1
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%1 = load i32* %arrayidx2, align 4
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%inc = add nsw i32 %1, 1
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store i32 %inc, i32* %arrayidx2, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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ret i32 0
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}
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