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ee9e4fc042
PHI that has at least one unrelocated input cannot cause any issues by itself, though its uses should be carefully verified. With this patch PHIs are allowed to have any inputs but when all inputs are unrelocated the PHI is marked as unrelocated and if not all inputs are unrelocated then the PHI is marked as poisoned. Poisoned pointers can be used only in three ways: to derive new pointers, in PHIs or in comparisons against constants that are exclusively derived from null. Patch by Daniil Suchkov! Differential Revision: https://reviews.llvm.org/D41006 llvm-svn: 321438
27 lines
1.1 KiB
LLVM
27 lines
1.1 KiB
LLVM
; XFAIL: *
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; RUN: opt -safepoint-ir-verifier-print-only -verify-safepoint-ir -S %s 2>&1 | FileCheck %s
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; In %merge %val.unrelocated, %ptr and %arg should be unrelocated.
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; FIXME: if this test fails it is a false-positive alarm. IR is correct.
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define void @test.unrelocated-phi.ok(i8 addrspace(1)* %arg) gc "statepoint-example" {
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; CHECK-LABEL: Verifying gc pointers in function: test.unrelocated-phi.ok
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bci_0:
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%ptr = getelementptr i8, i8 addrspace(1)* %arg, i64 4
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br i1 undef, label %left, label %right
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left:
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%safepoint_token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* undef, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
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br label %merge
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right:
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br label %merge
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merge:
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; CHECK: No illegal uses found by SafepointIRVerifier in: test.unrelocated-phi.ok
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%val.unrelocated = phi i8 addrspace(1)* [ %arg, %left ], [ %ptr, %right ]
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%c = icmp eq i8 addrspace(1)* %val.unrelocated, %arg
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ret void
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}
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
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