derek.holloway
7502bf64a4
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43 lines
1.4 KiB
LLVM
43 lines
1.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=early-cse -earlycse-debug-hash -S %s | FileCheck %s
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%mystruct = type { i32 }
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; @var is global so that *every* GEP argument is Constant.
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@var = external global %mystruct
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; Control flow is to make the dominance tree consider the final icmp before it
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; gets to simplify the purely constant one (%tst). Since that icmp uses the
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; select that gets considered next. Finally the select simplification looks at
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; the %tst icmp and we don't want it to speculate about what happens if "i32 0"
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; is actually "i32 1", broken universes are automatic UB.
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;
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; In this case doing the speculation would create an invalid GEP(@var, 0, 1) and
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; crash.
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define i1 @test_constant_speculation(i1 %c) {
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; CHECK-LABEL: @test_constant_speculation(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %c, label [[END:%.*]], label [[SELECT:%.*]]
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; CHECK: select:
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[TMP:%.*]] = phi ptr [ null, [[ENTRY:%.*]] ], [ @var, [[SELECT]] ]
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; CHECK-NEXT: [[RES:%.*]] = icmp eq ptr [[TMP]], null
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; CHECK-NEXT: ret i1 [[RES]]
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;
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entry:
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br i1 %c, label %end, label %select
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select:
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%tst = icmp eq i32 1, 0
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%sel = select i1 %tst, ptr null, ptr @var
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br label %end
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end:
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%tmp = phi ptr [null, %entry], [%sel, %select]
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%res = icmp eq ptr %tmp, null
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ret i1 %res
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}
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