25ec1a3e60
Summary: This is a step towards using operand bundles to carry deopt state till RewriteStatepointsForGC. The change adds a flag to RewriteStatepointsForGC that teaches it to pick up deopt state from a `"deopt"` operand bundle attached to the `call` or `invoke` it is wrapping. The command line flag added, `-rs4gc-use-deopt-bundles`, will only exist for a short while. Once we are able to pipe deopt bundle state through the full optimization pipeline without problems, we will "constant fold" `-rs4gc-use-deopt-bundles` to `true`. Reviewers: swaroop.sridhar, reames Subscribers: llvm-commits, sanjoy Differential Revision: http://reviews.llvm.org/D13372 llvm-svn: 250489
89 lines
3.3 KiB
LLVM
89 lines
3.3 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 -rs4gc-use-deopt-bundles -spp-rematerialization-threshold=0 -S | FileCheck %s
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; Trivial relocation over a single call
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declare void @foo()
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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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entry:
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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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; Two safepoints in a row (i.e. consistent liveness)
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call void @foo() [ "deopt"(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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define i8 addrspace(1)* @test2(i8 addrspace(1)* %obj) gc "statepoint-example" {
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; CHECK-LABEL: @test2
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entry:
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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.relocated2 = call coldcc i8 addrspace(1)*
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; A simple derived pointer
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call void @foo() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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call void @foo() [ "deopt"(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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define i8 @test3(i8 addrspace(1)* %obj) gc "statepoint-example" {
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entry:
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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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; 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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%derived = getelementptr i8, i8 addrspace(1)* %obj, i64 10
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call void @foo() [ "deopt"(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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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: ; preds = %entry
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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 void @foo() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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br label %merge
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untaken: ; preds = %entry
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; CHECK-LABEL: untaken:
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: %obj.relocated2 = call coldcc i8 addrspace(1)*
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call void @foo() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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br label %merge
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merge: ; preds = %untaken, %taken
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; CHECK-LABEL: merge:
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; CHECK-NEXT: %.0 = phi i8 addrspace(1)* [ %obj.relocated, %taken ], [ %obj.relocated2, %untaken ]
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; CHECK-NEXT: ret i8 addrspace(1)* %.0
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; When run over a function which doesn't opt in, should do nothing!
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ret i8 addrspace(1)* %obj
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}
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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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entry:
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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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%0 = 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 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(i64, i32, void ()*, i32, i32, ...)
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