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51f53b7f5a
overflow when computing a integer division to round up. Thanks to Nick Lewycky for noticing this! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73862 91177308-0d34-0410-b5e6-96231b3b80d8
32 lines
1016 B
LLVM
32 lines
1016 B
LLVM
; RUN: llvm-as < %s | opt -indvars -loop-deletion | llvm-dis | grep phi | count 1
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; XFAIL: *
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; Indvars can't evaluate this loop, because ScalarEvolution can't compute
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; an exact trip count, because it doesn't know if dividing by the stride will
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; have a remainder. It could be done with more aggressive VRP though.
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define i32 @test(i32 %x_offs) nounwind readnone {
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entry:
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%0 = icmp sgt i32 %x_offs, 4 ; <i1> [#uses=1]
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br i1 %0, label %bb.nph, label %bb2
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bb.nph: ; preds = %entry
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br label %bb
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bb: ; preds = %bb1, %bb.nph
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%x_offs_addr.01 = phi i32 [ %1, %bb1 ], [ %x_offs, %bb.nph ] ; <i32> [#uses=1]
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%1 = add i32 %x_offs_addr.01, -4 ; <i32> [#uses=3]
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br label %bb1
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bb1: ; preds = %bb
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%2 = icmp sgt i32 %1, 4 ; <i1> [#uses=1]
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br i1 %2, label %bb, label %bb1.bb2_crit_edge
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bb1.bb2_crit_edge: ; preds = %bb1
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br label %bb2
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bb2: ; preds = %bb1.bb2_crit_edge, %entry
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%x_offs_addr.0.lcssa = phi i32 [ %1, %bb1.bb2_crit_edge ], [ %x_offs, %entry ] ; <i32> [#uses=1]
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ret i32 %x_offs_addr.0.lcssa
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}
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