mirror of
https://github.com/c64scene-ar/llvm-6502.git
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ead2d1fbe0
Summary: This change adds two new parameters to the statepoint intrinsic, `i64 id` and `i32 num_patch_bytes`. `id` gets propagated to the ID field in the generated StackMap section. If the `num_patch_bytes` is non-zero then the statepoint is lowered to `num_patch_bytes` bytes of nops instead of a call (the spill and reload code remains unchanged). A non-zero `num_patch_bytes` is useful in situations where a language runtime requires complete control over how a call is lowered. This change brings statepoints one step closer to patchpoints. With some additional work (that is not part of this patch) it should be possible to get rid of `TargetOpcode::STATEPOINT` altogether. PlaceSafepoints generates `statepoint` wrappers with `id` set to `0xABCDEF00` (the old default value for the ID reported in the stackmap) and `num_patch_bytes` set to `0`. This can be made more sophisticated later. Reviewers: reames, pgavlin, swaroop.sridhar, AndyAyers Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D9546 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237214 91177308-0d34-0410-b5e6-96231b3b80d8
80 lines
1.7 KiB
LLVM
80 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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} |