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[LVI][CVP] CVP error deleted the abs function #68682

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DianQK opened this issue Oct 10, 2023 · 4 comments · Fixed by #68711 or llvm/llvm-project-release-prs#733
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[LVI][CVP] CVP error deleted the abs function #68682

DianQK opened this issue Oct 10, 2023 · 4 comments · Fixed by #68711 or llvm/llvm-project-release-prs#733
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llvm:transforms miscompilation release:backport release:merged
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LLVM 17.0.X Release

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DianQK commented Oct 10, 2023 •
edited
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I tried this IR:

define i32 @constant_range_and_undef_2(i1 %c0, i1 %c1, i8 %v1) {
start:
  br i1 %c0, label %bb0, label %bb1

bb0:
  %v1_i32 = zext i8 %v1 to i32
  br label %bb1

bb1:
  %x = phi i32 [ %v1_i32, %bb0 ], [ undef, %start ]
  br i1 %c1, label %bb0, label %bb2

bb2:
  %z = call i32 @llvm.abs.i32(i32 %x, i1 false)
  ret i32 %z
}

abs should not be deleted by CVP.

alive2: https://alive2.llvm.org/ce/z/k_8paG.

Split issue from #68381.
@DianQK DianQK self-assigned this Oct 10, 2023
@DianQK DianQK changed the title [LVI][CVP] CVP error deleted the and function [LVI][CVP] CVP error deleted the abs function Oct 10, 2023
@DianQK DianQK mentioned this issue Oct 10, 2023
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DianQK added a commit that referenced this issue Oct 15, 2023
@DianQK
[LVI][CVP] Treat undef like a full range on abs(x, false) (#68711)
2ad9a65 
Fixes #68682.
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DianQK commented Oct 16, 2023

Reopening it, backport should make sense even if no known end-to-end miscompilations are found.

@DianQK DianQK reopened this Oct 16, 2023
@DianQK DianQK added this to the LLVM 17.0.X Release milestone Oct 16, 2023
@github-project-automation github-project-automation bot moved this to Needs Triage in LLVM Release Status Oct 16, 2023
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DianQK commented Oct 16, 2023

/cherry-pick 2ad9a65

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llvmbot commented Oct 16, 2023

/branch llvm/llvm-project-release-prs/issue68682

@llvmbot llvmbot mentioned this issue Oct 16, 2023
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llvmbot commented Oct 16, 2023

/pull-request llvm/llvm-project-release-prs#733

@tru tru moved this from Needs Triage to Needs Review in LLVM Release Status Oct 16, 2023
@tru tru moved this from Needs Review to Needs Merge in LLVM Release Status Oct 17, 2023
tru pushed a commit that referenced this issue Oct 24, 2023
@DianQK @tru
[LVI][CVP] Treat undef like a full range on abs(x, false) (#68711)
a710137 
Fixes #68682.

(cherry picked from commit 2ad9a65)
@tru tru moved this from Needs Merge to Done in LLVM Release Status Oct 24, 2023
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Labels
llvm:transforms miscompilation release:backport release:merged
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LLVM Release Status
Status: Done
Milestone
LLVM 17.0.X Release
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@EugeneZelenko @DianQK @llvmbot