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
61 lines
2.1 KiB
LLVM
61 lines
2.1 KiB
LLVM
; RUN: opt -S -rewrite-statepoints-for-gc %s | FileCheck %s
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declare void @foo()
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declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
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; constants don't get relocated.
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define i8 @test() gc "statepoint-example" {
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; CHECK-LABEL: @test
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; CHECK: gc.statepoint
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; CHECK-NEXT: load i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*)
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entry:
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call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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%res = load i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*)
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ret i8 %res
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}
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; Mostly just here to show reasonable code test can come from.
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define i8 @test2(i8 addrspace(1)* %p) gc "statepoint-example" {
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; CHECK-LABEL: @test2
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; CHECK: gc.statepoint
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; CHECK-NEXT: gc.relocate
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; CHECK-NEXT: icmp
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entry:
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call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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%cmp = icmp eq i8 addrspace(1)* %p, null
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br i1 %cmp, label %taken, label %not_taken
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taken:
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ret i8 0
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not_taken:
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%cmp2 = icmp ne i8 addrspace(1)* %p, null
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br i1 %cmp2, label %taken, label %dead
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dead:
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; We see that dead can't be reached, but the optimizer might not. It's
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; completely legal for it to exploit the fact that if dead executed, %p
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; would have to equal null. This can produce intermediate states which
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; look like that of test above, even if arbitrary constant addresses aren't
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; legal in the source language
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%addr = getelementptr i8, i8 addrspace(1)* %p, i32 15
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%res = load i8, i8addrspace(1)* %addr
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ret i8 %res
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}
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@G = addrspace(1) global i8 5
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; Globals don't move and thus don't get relocated
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define i8 @test3(i1 %always_true) gc "statepoint-example" {
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; CHECK-LABEL: @test3
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; CHECK: gc.statepoint
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; CHECK-NEXT: load i8, i8 addrspace(1)* @G
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entry:
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call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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%res = load i8, i8 addrspace(1)* @G, align 1
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ret i8 %res
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}
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