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fb46056c3a
Commit r259357 was reverted because it caused PR26629. We were assuming all roots of a vectorizable tree could be truncated to the same width, which is not the case in general. This commit reapplies the patch along with a fix and a new test case to ensure we don't regress because of this issue again. This should fix PR26629. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261212 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
1.4 KiB
LLVM
56 lines
1.4 KiB
LLVM
; RUN: opt -S -slp-vectorizer < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64--linux-gnu"
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; This test ensures that we do not regress due to PR26364. The vectorizer
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; should not compute a smaller size for %k.13 since it is in a use-def cycle
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; and cannot be demoted.
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;
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; CHECK-LABEL: @PR26364
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; CHECK: %k.13 = phi i32
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;
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define fastcc void @PR26364() {
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entry:
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br i1 undef, label %for.end11, label %for.cond4
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for.cond4:
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%k.13 = phi i32 [ undef, %entry ], [ %k.3, %for.cond4 ]
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%e.02 = phi i32 [ 1, %entry ], [ 0, %for.cond4 ]
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%e.1 = select i1 undef, i32 %e.02, i32 0
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%k.3 = select i1 undef, i32 %k.13, i32 undef
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br label %for.cond4
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for.end11:
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ret void
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}
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; This test ensures that we do not regress due to PR26629. We must look at
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; every root in the vectorizable tree when computing minimum sizes since one
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; root may require fewer bits than another.
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;
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; CHECK-LABEL: @PR26629
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; CHECK-NOT: {{.*}} and <2 x i72>
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;
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define void @PR26629(i32* %c) {
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entry:
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br i1 undef, label %for.ph, label %for.end
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for.ph:
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%0 = load i32, i32* %c, align 4
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br label %for.body
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for.body:
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%d = phi i72 [ 576507472957710340, %for.ph ], [ %bf.set17, %for.body ]
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%sub = sub i32 %0, undef
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%bf.clear13 = and i72 %d, -576460748008464384
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%1 = zext i32 %sub to i72
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%bf.value15 = and i72 %1, 8191
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%bf.clear16 = or i72 %bf.value15, %bf.clear13
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%bf.set17 = or i72 %bf.clear16, undef
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br label %for.body
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for.end:
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ret void
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}
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