10d720b5b4
As d5c89cc proved not to be NFC, prior to this change, duplicate
`MemoryAccess` entries were being added to the worklist in
`isWriteAtEndOfFunction`, prematurely reaching the exploration
limit. When `MemorySSAScanLimit` cutoff is set to 4, the store
was previously not eliminated. Introduce a regression test for
additional validation. The test is a simplified variant of function
`ntlmssp_create_session_key`, coming from @dtcxzyw/llvm-opt-benchmark,
bench/wireshark/original/packet-ntlmssp.c.ll.
119 lines
4.4 KiB
LLVM
119 lines
4.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=dse -S | FileCheck --check-prefix=NO-LIMIT %s
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; RUN: opt < %s -passes=dse -dse-memoryssa-scanlimit=0 -S | FileCheck --check-prefix=LIMIT-0 %s
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; RUN: opt < %s -passes=dse -dse-memoryssa-scanlimit=2 -S | FileCheck --check-prefix=LIMIT-2 %s
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; RUN: opt < %s -passes=dse -dse-memoryssa-scanlimit=3 -S | FileCheck --check-prefix=LIMIT-3 %s
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; RUN: opt < %s -passes=dse -dse-memoryssa-scanlimit=4 -S | FileCheck --check-prefix=LIMIT-4 %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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define void @test2(ptr noalias %P, ptr noalias %Q, ptr noalias %R) {
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; NO-LIMIT-LABEL: @test2(
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; NO-LIMIT-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; NO-LIMIT: bb1:
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; NO-LIMIT-NEXT: br label [[BB3:%.*]]
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; NO-LIMIT: bb2:
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; NO-LIMIT-NEXT: br label [[BB3]]
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; NO-LIMIT: bb3:
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; NO-LIMIT-NEXT: store i32 0, ptr [[Q:%.*]], align 4
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; NO-LIMIT-NEXT: store i32 0, ptr [[R:%.*]], align 4
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; NO-LIMIT-NEXT: store i32 0, ptr [[P:%.*]], align 4
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; NO-LIMIT-NEXT: ret void
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;
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; LIMIT-0-LABEL: @test2(
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; LIMIT-0-NEXT: store i32 1, ptr [[P:%.*]], align 4
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; LIMIT-0-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; LIMIT-0: bb1:
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; LIMIT-0-NEXT: br label [[BB3:%.*]]
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; LIMIT-0: bb2:
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; LIMIT-0-NEXT: br label [[BB3]]
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; LIMIT-0: bb3:
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; LIMIT-0-NEXT: store i32 0, ptr [[Q:%.*]], align 4
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; LIMIT-0-NEXT: store i32 0, ptr [[R:%.*]], align 4
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; LIMIT-0-NEXT: store i32 0, ptr [[P]], align 4
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; LIMIT-0-NEXT: ret void
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;
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; LIMIT-2-LABEL: @test2(
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; LIMIT-2-NEXT: store i32 1, ptr [[P:%.*]], align 4
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; LIMIT-2-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; LIMIT-2: bb1:
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; LIMIT-2-NEXT: br label [[BB3:%.*]]
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; LIMIT-2: bb2:
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; LIMIT-2-NEXT: br label [[BB3]]
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; LIMIT-2: bb3:
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; LIMIT-2-NEXT: store i32 0, ptr [[Q:%.*]], align 4
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; LIMIT-2-NEXT: store i32 0, ptr [[R:%.*]], align 4
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; LIMIT-2-NEXT: store i32 0, ptr [[P]], align 4
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; LIMIT-2-NEXT: ret void
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;
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; LIMIT-3-LABEL: @test2(
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; LIMIT-3-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; LIMIT-3: bb1:
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; LIMIT-3-NEXT: br label [[BB3:%.*]]
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; LIMIT-3: bb2:
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; LIMIT-3-NEXT: br label [[BB3]]
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; LIMIT-3: bb3:
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; LIMIT-3-NEXT: store i32 0, ptr [[Q:%.*]], align 4
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; LIMIT-3-NEXT: store i32 0, ptr [[R:%.*]], align 4
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; LIMIT-3-NEXT: store i32 0, ptr [[P:%.*]], align 4
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; LIMIT-3-NEXT: ret void
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;
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store i32 1, ptr %P
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br i1 true, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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store i32 0, ptr %Q
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store i32 0, ptr %R
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store i32 0, ptr %P
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ret void
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}
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define void @duplicate_worklist_endoffunction(ptr %ptr.0, ptr %ptr.1) {
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; LIMIT-4-LABEL: @duplicate_worklist_endoffunction(
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; LIMIT-4-NEXT: entry:
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; LIMIT-4-NEXT: [[STACK_0:%.*]] = alloca [768 x i8], align 16
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; LIMIT-4-NEXT: [[VAL_0:%.*]] = load i16, ptr [[PTR_1:%.*]], align 8
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; LIMIT-4-NEXT: [[COND:%.*]] = icmp ugt i16 [[VAL_0]], 24
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; LIMIT-4-NEXT: br i1 [[COND]], label [[BB_1:%.*]], label [[EXIT:%.*]]
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; LIMIT-4: bb.1:
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; LIMIT-4-NEXT: br label [[LOOP:%.*]]
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; LIMIT-4: loop:
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; LIMIT-4-NEXT: [[IV:%.*]] = phi i64 [ 0, [[BB_1]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
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; LIMIT-4-NEXT: [[PTR_3:%.*]] = getelementptr i8, ptr [[STACK_0]], i64 [[IV]]
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; LIMIT-4-NEXT: store ptr [[PTR_0:%.*]], ptr [[PTR_3]], align 2
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; LIMIT-4-NEXT: [[IV_NEXT]] = add nuw i64 [[IV]], 1
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; LIMIT-4-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 10
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; LIMIT-4-NEXT: br i1 [[EXITCOND]], label [[EXIT]], label [[LOOP]]
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; LIMIT-4: exit:
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; LIMIT-4-NEXT: ret void
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;
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entry:
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%stack.0 = alloca [768 x i8], align 16
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%stack.1 = alloca [20 x i8], align 8
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%val.0 = load i16, ptr %ptr.1, align 8
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%cond = icmp ugt i16 %val.0, 24
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br i1 %cond, label %bb.1, label %exit
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bb.1: ; preds = %entry
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%ptr.2 = getelementptr inbounds i8, ptr %ptr.1, i64 8
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%val.1 = load i64, ptr %ptr.2, align 8
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store i64 %val.1, ptr %stack.1, align 8
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br label %loop
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loop: ; preds = %loop, %bb.1
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%iv = phi i64 [ 0, %bb.1 ], [ %iv.next, %loop ]
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%ptr.3 = getelementptr i8, ptr %stack.0, i64 %iv
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store ptr %ptr.0, ptr %ptr.3, align 2
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%iv.next = add nuw i64 %iv, 1
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%exitcond = icmp eq i64 %iv.next, 10
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br i1 %exitcond, label %exit, label %loop
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exit: ; preds = %loop, %entry
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ret void
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}
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