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d2b07a0d57
We currently check if the exact trip count is known and is smaller than the "tiny loop" bound. We should be checking the maximum bound on the trip count instead. Differential Revision: https://reviews.llvm.org/D27690 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289583 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
2.3 KiB
LLVM
58 lines
2.3 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-interleave=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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@a = common global [2048 x i32] zeroinitializer, align 16
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@b = common global [2048 x i32] zeroinitializer, align 16
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@c = common global [2048 x i32] zeroinitializer, align 16
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;CHECK-LABEL: @example1(
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;CHECK-NOT: load <4 x i32>
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;CHECK: ret void
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define void @example1() nounwind uwtable ssp {
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br label %1
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; <label>:1 ; preds = %1, %0
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%indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %1 ]
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%2 = getelementptr inbounds [2048 x i32], [2048 x i32]* @b, i64 0, i64 %indvars.iv
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%3 = load i32, i32* %2, align 4
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%4 = getelementptr inbounds [2048 x i32], [2048 x i32]* @c, i64 0, i64 %indvars.iv
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%5 = load i32, i32* %4, align 4
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%6 = add nsw i32 %5, %3
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%7 = getelementptr inbounds [2048 x i32], [2048 x i32]* @a, i64 0, i64 %indvars.iv
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store i32 %6, i32* %7, 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, 8 ; <----- A really small trip count.
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br i1 %exitcond, label %8, label %1
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; <label>:8 ; preds = %1
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ret void
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}
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;CHECK-LABEL: @bound1(
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;CHECK-NOT: load <4 x i32>
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;CHECK: ret void
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define void @bound1(i32 %k) nounwind uwtable ssp {
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br label %1
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; <label>:1 ; preds = %1, %0
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%indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %1 ]
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%2 = getelementptr inbounds [2048 x i32], [2048 x i32]* @b, i64 0, i64 %indvars.iv
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%3 = load i32, i32* %2, align 4
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%4 = getelementptr inbounds [2048 x i32], [2048 x i32]* @c, i64 0, i64 %indvars.iv
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%5 = load i32, i32* %4, align 4
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%6 = add nsw i32 %5, %3
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%7 = getelementptr inbounds [2048 x i32], [2048 x i32]* @a, i64 0, i64 %indvars.iv
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store i32 %6, i32* %7, 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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%large = icmp sge i32 %lftr.wideiv, 8
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%exitcond = icmp eq i32 %lftr.wideiv, %k
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%realexit = or i1 %large, %exitcond
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br i1 %realexit, label %8, label %1
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; <label>:8 ; preds = %1
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ret void
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}
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