3c514d31d7
Update the EarlyCSE tests to use opaque pointers. Worth noting that this leaves some bitcast ptr to ptr instructions in the input IR behind which are no longer necessary. This is because these use numbered instructions, so it's hard to drop them in an automated fashion (as it would require renumbering all other instructions as well). I'm leaving that as a problem for another day. The test updates have been performed using https://gist.github.com/nikic/98357b71fd67756b0f064c9517b62a34. Differential Revision: https://reviews.llvm.org/D127278
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 -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() {
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; CHECK-LABEL: @test_constant_speculation(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 undef, 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 undef, 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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