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https://github.com/c64scene-ar/llvm-6502.git
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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
81 lines
1.7 KiB
LLVM
81 lines
1.7 KiB
LLVM
; Tests to ensure that we are not placing backedge safepoints in
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; loops which are clearly finite.
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;; RUN: opt %s -place-safepoints -S | FileCheck %s
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; A simple counted loop with trivially known range
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define void @test1(i32) gc "statepoint-example" {
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; CHECK-LABEL: test1
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; CHECK-LABEL: entry
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; CHECK: statepoint
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; CHECK-LABEL: loop
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; CHECK-NOT: statepoint
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entry:
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br label %loop
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loop:
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%counter = phi i32 [ 0 , %entry ], [ %counter.inc , %loop ]
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%counter.inc = add i32 %counter, 1
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%counter.cmp = icmp slt i32 %counter.inc, 16
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br i1 %counter.cmp, label %loop, label %exit
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exit:
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ret void
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}
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; The same counted loop, but with an unknown early exit
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define void @test2(i32) gc "statepoint-example" {
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; CHECK-LABEL: test2
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; CHECK-LABEL: entry
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; CHECK: statepoint
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; CHECK-LABEL: loop
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; CHECK-NOT: statepoint
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entry:
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br label %loop
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loop:
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%counter = phi i32 [ 0 , %entry ], [ %counter.inc , %continue ]
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%counter.inc = add i32 %counter, 1
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%counter.cmp = icmp slt i32 %counter.inc, 16
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br i1 undef, label %continue, label %exit
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continue:
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br i1 %counter.cmp, label %loop, label %exit
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exit:
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ret void
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}
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; The range is a 8 bit value and we can't overflow
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define void @test3(i8 %upper) gc "statepoint-example" {
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; CHECK-LABEL: test3
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; CHECK-LABEL: entry
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; CHECK: statepoint
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; CHECK-LABEL: loop
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; CHECK-NOT: statepoint
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entry:
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br label %loop
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loop:
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%counter = phi i8 [ 0 , %entry ], [ %counter.inc , %loop ]
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%counter.inc = add nsw i8 %counter, 1
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%counter.cmp = icmp slt i8 %counter.inc, %upper
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br i1 %counter.cmp, label %loop, label %exit
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exit:
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ret void
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}
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; This function is inlined when inserting a poll.
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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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entry:
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call void @do_safepoint()
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ret void
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}
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