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5c7f7462e4
This changes the shape of the statepoint intrinsic from:
@llvm.experimental.gc.statepoint(anyptr target, i32 # call args, i32 unused, ...call args, i32 # deopt args, ...deopt args, ...gc args)
to:
@llvm.experimental.gc.statepoint(anyptr target, i32 # call args, i32 flags, ...call args, i32 # transition args, ...transition args, i32 # deopt args, ...deopt args, ...gc args)
This extension offers the backend the opportunity to insert (somewhat) arbitrary code to manage the transition from GC-aware code to code that is not GC-aware and back.
In order to support the injection of transition code, this extension wraps the STATEPOINT ISD node generated by the usual lowering lowering with two additional nodes: GC_TRANSITION_START and GC_TRANSITION_END. The transition arguments that were passed passed to the intrinsic (if any) are lowered and provided as operands to these nodes and may be used by the backend during code generation.
Eventually, the lowering of the GC_TRANSITION_{START,END} nodes should be informed by the GC strategy in use for the function containing the intrinsic call; for now, these nodes are instead replaced with no-ops.
Differential Revision: http://reviews.llvm.org/D9501
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236888 91177308-0d34-0410-b5e6-96231b3b80d8
89 lines
3.6 KiB
LLVM
89 lines
3.6 KiB
LLVM
; This is a collection of really basic tests for gc.statepoint rewriting.
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; RUN: opt %s -rewrite-statepoints-for-gc -S | FileCheck %s
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declare void @foo()
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; Trivial relocation over a single call
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define i8 addrspace(1)* @test1(i8 addrspace(1)* %obj) gc "statepoint-example" {
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; CHECK-LABEL: @test1
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; CHECK-LABEL: entry:
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: %obj.relocated = call coldcc i8 addrspace(1)*
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entry:
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* %obj
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}
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; Two safepoints in a row (i.e. consistent liveness)
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define i8 addrspace(1)* @test2(i8 addrspace(1)* %obj) gc "statepoint-example" {
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; CHECK-LABEL: @test2
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; CHECK-LABEL: entry:
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: %obj.relocated = call coldcc i8 addrspace(1)*
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: %obj.relocated1 = call coldcc i8 addrspace(1)*
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entry:
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* %obj
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}
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; A simple derived pointer
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define i8 @test3(i8 addrspace(1)* %obj) gc "statepoint-example" {
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; CHECK-LABEL: entry:
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; CHECK-NEXT: getelementptr
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: %derived.relocated = call coldcc i8 addrspace(1)*
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; CHECK-NEXT: %obj.relocated = call coldcc i8 addrspace(1)*
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; CHECK-NEXT: load i8, i8 addrspace(1)* %derived.relocated
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; CHECK-NEXT: load i8, i8 addrspace(1)* %obj.relocated
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entry:
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%derived = getelementptr i8, i8 addrspace(1)* %obj, i64 10
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
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%a = load i8, i8 addrspace(1)* %derived
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%b = load i8, i8 addrspace(1)* %obj
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%c = sub i8 %a, %b
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ret i8 %c
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}
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; Tests to make sure we visit both the taken and untaken predeccessor
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; of merge. This was a bug in the dataflow liveness at one point.
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define i8 addrspace(1)* @test4(i1 %cmp, i8 addrspace(1)* %obj) gc "statepoint-example" {
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entry:
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br i1 %cmp, label %taken, label %untaken
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taken:
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; CHECK-LABEL: taken:
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: %obj.relocated = call coldcc i8 addrspace(1)*
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, 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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untaken:
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; CHECK-LABEL: untaken:
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: %obj.relocated1 = call coldcc i8 addrspace(1)*
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, 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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merge:
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; CHECK-LABEL: merge:
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; CHECK-NEXT: %.0 = phi i8 addrspace(1)* [ %obj.relocated, %taken ], [ %obj.relocated1, %untaken ]
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; CHECK-NEXT: ret i8 addrspace(1)* %.0
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ret i8 addrspace(1)* %obj
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}
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; When run over a function which doesn't opt in, should do nothing!
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define i8 addrspace(1)* @test5(i8 addrspace(1)* %obj) gc "ocaml" {
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; CHECK-LABEL: @test5
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; CHECK-LABEL: entry:
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; CHECK-NEXT: gc.statepoint
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; CHECK-NOT: %obj.relocated = call coldcc i8 addrspace(1)*
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entry:
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* %obj
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}
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declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()*, i32, i32, ...)
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