13ffde316a
Remove compares after replacing all uses. Cleaning dead compares can enable additional simplifications when adjusting the position of the pass slightly. In particular, it seems like the additional dead instructions may prevent SimplifyCFG performing some folds. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D158760
71 lines
2.8 KiB
LLVM
71 lines
2.8 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: 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: 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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