e6a1657fa3
This patch adds additional logic to add additional facts for A != B, if A is a monotonically increasing induction phi. The motivating use case for this is removing checks when using iterators with hardened libc++, e.g. https://godbolt.org/z/zhKEP37vG. The patch pulls in SCEV to detect AddRecs. If possible, the patch adds the following facts for a AddRec phi PN with StartValue as incoming value from the loo preheader and B being an upper bound for PN from a condition in the loop header. * (ICMP_UGE, PN, StartValue) * (ICMP_ULT, PN, B) [if (ICMP_ULE, StartValue, B)] The patch also adds an optional precondition to FactOrCheck (the new DoesHold field) , which can be used to only add a fact if the precondition holds at the point the fact is added to the constraint system. Depends on D151799. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D152730
77 lines
3.2 KiB
LLVM
77 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt -passes='require<demanded-bits>,constraint-elimination,require<demanded-bits>' -disable-verify -verify-analysis-invalidation=false -debug-pass-manager -disable-output %s 2>&1 | FileCheck %s
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; Check that constraint-elimination properly invalidates anlyses.
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; FIXME: ssub simplification currently doesn't properly set the change status
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; after modifying the IR, which causes DemandedBits to be preserved.
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; CHECK: Running pass: RequireAnalysisPass
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; CHECK-NEXT: Running analysis: DemandedBitsAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running analysis: AssumptionAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running analysis: TargetIRAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running analysis: DominatorTreeAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running pass: ConstraintEliminationPass on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running analysis: LoopAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running analysis: ScalarEvolutionAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running analysis: TargetLibraryAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running analysis: OptimizationRemarkEmitterAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Invalidating analysis: DemandedBitsAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running pass: RequireAnalysisPass
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; CHECK-NEXT: Running analysis: DemandedBitsAnalysis on ssub_no_overflow_due_to_or_conds
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; CHECK-NEXT: Running pass: RequireAnalysisPass
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; CHECK-NEXT: Running analysis: DemandedBitsAnalysis on uge_zext
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; CHECK-NEXT: Running analysis: AssumptionAnalysis on uge_zext
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; CHECK-NEXT: Running analysis: TargetIRAnalysis on uge_zext
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; CHECK-NEXT: Running analysis: DominatorTreeAnalysis on uge_zext
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; CHECK-NEXT: Running pass: ConstraintEliminationPass on uge_zext
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; CHECK-NEXT: Running analysis: LoopAnalysis on uge_zext
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; CHECK-NEXT: Running analysis: ScalarEvolutionAnalysis on uge_zext
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; CHECK-NEXT: Running analysis: TargetLibraryAnalysis on uge_zext
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; CHECK-NEXT: Running analysis: OptimizationRemarkEmitterAnalysis on uge_zext
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; CHECK-NEXT: Invalidating analysis: DemandedBitsAnalysis on uge_zext
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; CHECK-NEXT: Running pass: RequireAnalysisPass
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; CHECK-NEXT: Running analysis: DemandedBitsAnalysis on uge_zext
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declare { i8, i1 } @llvm.ssub.with.overflow.i8(i8, i8)
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define i8 @ssub_no_overflow_due_to_or_conds(i8 %a, i8 %b) {
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entry:
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%c.1 = icmp sle i8 %b, %a
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%c.2 = icmp slt i8 %a, 0
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%or.cond = or i1 %c.2, %c.1
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br i1 %or.cond, label %exit.fail, label %math
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math:
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%op = tail call { i8, i1 } @llvm.ssub.with.overflow.i8(i8 %b, i8 %a)
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%status = extractvalue { i8, i1 } %op, 1
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br i1 %status, label %exit.fail, label %exit.ok
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exit.ok:
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%res = extractvalue { i8, i1 } %op, 0
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ret i8 %res
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exit.fail:
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ret i8 0
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}
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declare void @use_res({ i8, i1 })
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define i1 @uge_zext(i8 %x, i16 %y) {
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entry:
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%x.ext = zext i8 %x to i16
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%c.1 = icmp uge i16 %x.ext, %y
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br i1 %c.1, label %bb1, label %bb2
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bb1:
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%t.1 = icmp uge i16 %x.ext, %y
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ret i1 %t.1
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bb2:
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ret i1 false
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}
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;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
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; CHECK: {{.*}}
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