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c60ad3e1fe
Summary: This patch changes gc.statepoint intrinsic's return type to token type instead of i32 type. Using token types could prevent LLVM to merge different gc.statepoint nodes into PHI nodes and cause further problems with gc relocations. The patch also changes the way on how gc.relocate and gc.result look for their corresponding gc.statepoint on unwind path. The current implementation uses the selector value extracted from a { i8*, i32 } landingpad as a hook to find the gc.statepoint, while the patch directly uses a token type landingpad (http://reviews.llvm.org/D15405) to find the gc.statepoint.
Reviewers: sanjoy, JosephTremoulet, pgavlin, igor-laevsky, mjacob
Subscribers: reames, mjacob, sanjoy, llvm-commits
Differential Revision: http://reviews.llvm.org/D15662
llvm-svn: 256443
88 lines
3.8 KiB
LLVM
88 lines
3.8 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 -spp-rematerialization-threshold=0 -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 token (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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; 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 token (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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call token (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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; 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 token (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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%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 token (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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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 token (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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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 token (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 token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...) |