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7a62a2a5ae
Previously, this pass ran over every function in the Module if added to the pass order. With this change, it runs only over those with a GC attribute where the GC explicitly opts in. A GC can also choose which of entry safepoint polls, backedge safepoint polls, and call safepoints it wants. I hope to get these exposed as checks on the GCStrategy at some point, but for now, the checks are manual string comparisons. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230097 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
2.2 KiB
LLVM
95 lines
2.2 KiB
LLVM
; RUN: opt %s -S -place-safepoints | FileCheck %s
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; Do we insert a simple entry safepoint?
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define void @test_entry() gc "statepoint-example" {
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; CHECK-LABEL: @test_entry
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entry:
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; CHECK-LABEL: entry
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; CHECK: statepoint
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ret void
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}
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; On a non-gc function, we should NOT get an entry safepoint
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define void @test_negative() {
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; CHECK-LABEL: @test_negative
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entry:
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; CHECK-NOT: statepoint
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ret void
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}
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; Do we insert a backedge safepoint in a statically
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; infinite loop?
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define void @test_backedge() gc "statepoint-example" {
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; CHECK-LABEL: test_backedge
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entry:
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; CHECK-LABEL: entry
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; This statepoint is technically not required, but we don't exploit that yet.
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; CHECK: statepoint
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br label %other
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; CHECK-LABEL: other
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; CHECK: statepoint
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other:
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call void undef()
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br label %other
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}
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; Check that we remove an unreachable block rather than trying
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; to insert a backedge safepoint
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define void @test_unreachable() gc "statepoint-example" {
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; CHECK-LABEL: test_unreachable
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entry:
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; CHECK-LABEL: entry
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; CHECK: statepoint
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ret void
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; CHECK-NOT: other
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; CHECK-NOT: statepoint
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other:
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br label %other
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}
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declare void @foo()
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; Do we turn a call into it's own statepoint
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define void @test_simple_call() gc "statepoint-example" {
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; CHECK-LABEL: test_simple_call
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entry:
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br label %other
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other:
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; CHECK-LABEL: other
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; CHECK: statepoint
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; CHECK-NOT: gc.result
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call void @foo()
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ret void
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}
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declare zeroext i1 @i1_return_i1(i1)
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define i1 @test_call_with_result() gc "statepoint-example" {
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; CHECK-LABEL: test_call_with_result
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; This is checking that a statepoint_poll + statepoint + result is
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; inserted for a function that takes 1 argument.
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; CHECK: gc.statepoint.p0f_isVoidf
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; CHECK: gc.statepoint.p0f_i1i1f
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; CHECK: (i1 (i1)* @i1_return_i1, i32 1, i32 0, i1 false, i32 0)
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; CHECK: gc.result.i1
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entry:
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%call1 = tail call i1 (i1)* @i1_return_i1(i1 false)
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ret i1 %call1
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}
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; This function is inlined when inserting a poll. To avoid recursive
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; issues, make sure we don't place safepoints in it.
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declare void @do_safepoint()
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define void @gc.safepoint_poll() {
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; CHECK-LABEL: gc.safepoint_poll
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; CHECK-LABEL: entry
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; CHECK-NEXT: do_safepoint
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; CHECK-NEXT: ret void
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entry:
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call void @do_safepoint()
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ret void
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}
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