derek.holloway
7502bf64a4
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37 lines
1.2 KiB
LLVM
37 lines
1.2 KiB
LLVM
; RUN: opt -S -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 < %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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; We use to fail on this loop because we did not properly handle the loop
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; invariant instruction anchored in the loop when used as a getelementptr index.
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; We would use the index from the original loop resulting in a use not dominated
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; by the definition.
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; PR16452
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; Verify that we don't miscompile this loop.
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; CHECK-LABEL: @t(
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; CHECK: <4 x i32>
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define void @t(ptr %p) {
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entry:
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br label %for.body
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for.body:
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%indvars.iv17 = phi i64 [ %indvars.next, %for.body ], [ 128, %entry ]
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; Loop invariant anchored in loop.
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%idxprom21 = zext i32 0 to i64
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%arrayidx23 = getelementptr inbounds [100 x [100 x i32]], ptr %p, i64 0, i64 %idxprom21, i64 %indvars.iv17
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store i32 poison, ptr %arrayidx23, align 4
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%indvars.next= add i64 %indvars.iv17, -1
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%0 = trunc i64 %indvars.next to i32
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%cmp15 = icmp ugt i32 %0, poison
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br i1 %cmp15, label %for.body, label %loopexit
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loopexit:
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ret void
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}
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