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llvm-mirror/test/Transforms/RewriteStatepointsForGC/relocation.ll
Chen Li c60ad3e1fe [gc.statepoint] Change gc.statepoint intrinsic's return type to token type instead of i32 type 
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
2015-12-26 07:54:32 +00:00

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; RUN: opt %s -rewrite-statepoints-for-gc -spp-rematerialization-threshold=0 -S 2>&1 | FileCheck %s
declare void @foo()
declare void @use(...)
define i64 addrspace(1)* @test1(i64 addrspace(1)* %obj, i64 addrspace(1)* %obj2, i1 %condition) gc "statepoint-example" {
entry:
; CHECK-LABEL: @test1
; CHECK-DAG: %obj.relocated
; CHECK-DAG: %obj2.relocated
%safepoint_token = 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 0)
br label %joint
joint:
; CHECK-LABEL: joint:
; CHECK: %phi1 = phi i64 addrspace(1)* [ %obj.relocated.casted, %entry ], [ %obj3, %joint2 ]
%phi1 = phi i64 addrspace(1)* [ %obj, %entry ], [ %obj3, %joint2 ]
br i1 %condition, label %use, label %joint2
use:
br label %joint2
joint2:
; CHECK-LABEL: joint2:
; CHECK: %phi2 = phi i64 addrspace(1)* [ %obj.relocated.casted, %use ], [ %obj2.relocated.casted, %joint ]
; CHECK: %obj3 = getelementptr i64, i64 addrspace(1)* %obj2.relocated.casted, i32 1
%phi2 = phi i64 addrspace(1)* [ %obj, %use ], [ %obj2, %joint ]
%obj3 = getelementptr i64, i64 addrspace(1)* %obj2, i32 1
br label %joint
}
declare i64 addrspace(1)* @generate_obj()
declare void @consume_obj(i64 addrspace(1)*)
declare i1 @rt()
define void @test2() gc "statepoint-example" {
; CHECK-LABEL: @test2
entry:
%obj_init = call i64 addrspace(1)* @generate_obj()
%obj = getelementptr i64, i64 addrspace(1)* %obj_init, i32 42
br label %loop
loop:
; CHECK: loop:
; CHECK-DAG: [ %obj_init.relocated.casted, %loop.backedge ]
; CHECK-DAG: [ %obj_init, %entry ]
; CHECK-DAG: [ %obj.relocated.casted, %loop.backedge ]
; CHECK-DAG: [ %obj, %entry ]
%index = phi i32 [ 0, %entry ], [ %index.inc, %loop.backedge ]
; CHECK-NOT: %location = getelementptr i64, i64 addrspace(1)* %obj, i32 %index
%location = getelementptr i64, i64 addrspace(1)* %obj, i32 %index
call void @consume_obj(i64 addrspace(1)* %location)
%index.inc = add i32 %index, 1
%condition = call i1 @rt()
br i1 %condition, label %loop_x, label %loop_y
loop_x:
br label %loop.backedge
loop.backedge:
%safepoint_token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @do_safepoint, i32 0, i32 0, i32 0, i32 0)
br label %loop
loop_y:
br label %loop.backedge
}
declare void @some_call(i8 addrspace(1)*)
define void @relocate_merge(i1 %cnd, i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: @relocate_merge
bci_0:
br i1 %cnd, label %if_branch, label %else_branch
if_branch:
; CHECK-LABEL: if_branch:
; CHECK: gc.statepoint
; CHECK: gc.relocate
%safepoint_token = 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 0)
br label %join
else_branch:
; CHECK-LABEL: else_branch:
; CHECK: gc.statepoint
; CHECK: gc.relocate
%safepoint_token1 = 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 0)
br label %join
join:
; We need to end up with a single relocation phi updated from both paths
; CHECK-LABEL: join:
; CHECK: phi i8 addrspace(1)*
; CHECK-DAG: [ %arg.relocated, %if_branch ]
; CHECK-DAG: [ %arg.relocated4, %else_branch ]
; CHECK-NOT: phi
call void (i8 addrspace(1)*) @some_call(i8 addrspace(1)* %arg)
ret void
}
; Make sure a use in a statepoint gets properly relocated at a previous one.
; This is basically just making sure that statepoints aren't accidentally
; treated specially.
define void @test3(i64 addrspace(1)* %obj) gc "statepoint-example" {
entry:
; CHECK-LABEL: @test3
; CHECK: gc.statepoint
; CHECK-NEXT: gc.relocate
; CHECK-NEXT: bitcast
; CHECK-NEXT: gc.statepoint
%safepoint_token = call token (i64, i32, void (i64)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidi64f(i64 0, i32 0, void (i64)* undef, i32 1, i32 0, i64 undef, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
%safepoint_token1 = call token (i64, i32, i32 (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i32p1i64f(i64 0, i32 0, i32 (i64 addrspace(1)*)* undef, i32 1, i32 0, i64 addrspace(1)* %obj, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
ret void
}
; Check specifically for the case where the result of a statepoint needs to
; be relocated itself
define void @test4() gc "statepoint-example" {
; CHECK-LABEL: @test4
; CHECK: gc.statepoint
; CHECK: gc.result
; CHECK: gc.statepoint
; CHECK: gc.relocate
; CHECK: @use(i8 addrspace(1)* %res.relocated)
%safepoint_token2 = tail call token (i64, i32, i8 addrspace(1)* ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_p1i8f(i64 0, i32 0, i8 addrspace(1)* ()* undef, i32 0, i32 0, i32 0, i32 0)
%res = call i8 addrspace(1)* @llvm.experimental.gc.result.p1i8(token %safepoint_token2)
call token (i64, i32, i8 addrspace(1)* ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_p1i8f(i64 0, i32 0, i8 addrspace(1)* ()* undef, i32 0, i32 0, i32 0, i32 0)
call void (...) @use(i8 addrspace(1)* %res)
unreachable
}
; Test updating a phi where not all inputs are live to begin with
define void @test5(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: test5
entry:
call token (i64, i32, i8 addrspace(1)* ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_p1i8f(i64 0, i32 0, i8 addrspace(1)* ()* undef, i32 0, i32 0, i32 0, i32 0)
switch i32 undef, label %kill [
i32 10, label %merge
i32 13, label %merge
]
kill:
br label %merge
merge:
; CHECK: merge:
; CHECK: %test = phi i8 addrspace(1)
; CHECK-DAG: [ null, %kill ]
; CHECK-DAG: [ %arg.relocated, %entry ]
; CHECK-DAG: [ %arg.relocated, %entry ]
%test = phi i8 addrspace(1)* [ null, %kill ], [ %arg, %entry ], [ %arg, %entry ]
call void (...) @use(i8 addrspace(1)* %test)
unreachable
}
; Check to make sure we handle values live over an entry statepoint
define void @test6(i8 addrspace(1)* %arg1, i8 addrspace(1)* %arg2,
i8 addrspace(1)* %arg3) gc "statepoint-example" {
; CHECK-LABEL: @test6
entry:
br i1 undef, label %gc.safepoint_poll.exit2, label %do_safepoint
do_safepoint:
; CHECK-LABEL: do_safepoint:
; CHECK: gc.statepoint
; CHECK: arg1.relocated =
; CHECK: arg2.relocated =
; CHECK: arg3.relocated =
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 3, i8 addrspace(1)* %arg1, i8 addrspace(1)* %arg2, i8 addrspace(1)* %arg3)
br label %gc.safepoint_poll.exit2
gc.safepoint_poll.exit2:
; CHECK-LABEL: gc.safepoint_poll.exit2:
; CHECK: phi i8 addrspace(1)*
; CHECK-DAG: [ %arg3, %entry ]
; CHECK-DAG: [ %arg3.relocated, %do_safepoint ]
; CHECK: phi i8 addrspace(1)*
; CHECK-DAG: [ %arg2, %entry ]
; CHECK-DAG: [ %arg2.relocated, %do_safepoint ]
; CHECK: phi i8 addrspace(1)*
; CHECK-DAG: [ %arg1, %entry ]
; CHECK-DAG: [ %arg1.relocated, %do_safepoint ]
call void (...) @use(i8 addrspace(1)* %arg1, i8 addrspace(1)* %arg2, i8 addrspace(1)* %arg3)
ret void
}
; Check relocation in a loop nest where a relocation happens in the outer
; but not the inner loop
define void @test_outer_loop(i8 addrspace(1)* %arg1, i8 addrspace(1)* %arg2,
i1 %cmp) gc "statepoint-example" {
; CHECK-LABEL: @test_outer_loop
bci_0:
br label %outer-loop
outer-loop:
; CHECK-LABEL: outer-loop:
; CHECK: phi i8 addrspace(1)* [ %arg2, %bci_0 ], [ %arg2.relocated, %outer-inc ]
; CHECK: phi i8 addrspace(1)* [ %arg1, %bci_0 ], [ %arg1.relocated, %outer-inc ]
br label %inner-loop
inner-loop:
br i1 %cmp, label %inner-loop, label %outer-inc
outer-inc:
; CHECK-LABEL: outer-inc:
; CHECK: %arg1.relocated
; CHECK: %arg2.relocated
%safepoint_token = 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 2, i8 addrspace(1)* %arg1, i8 addrspace(1)* %arg2)
br label %outer-loop
}
; Check that both inner and outer loops get phis when relocation is in
; inner loop
define void @test_inner_loop(i8 addrspace(1)* %arg1, i8 addrspace(1)* %arg2,
i1 %cmp) gc "statepoint-example" {
; CHECK-LABEL: @test_inner_loop
bci_0:
br label %outer-loop
outer-loop:
; CHECK-LABEL: outer-loop:
; CHECK: phi i8 addrspace(1)* [ %arg2, %bci_0 ], [ %arg2.relocated, %outer-inc ]
; CHECK: phi i8 addrspace(1)* [ %arg1, %bci_0 ], [ %arg1.relocated, %outer-inc ]
br label %inner-loop
inner-loop:
; CHECK-LABEL: inner-loop
; CHECK: phi i8 addrspace(1)*
; CHECK-DAG: %outer-loop ]
; CHECK-DAG: [ %arg2.relocated, %inner-loop ]
; CHECK: phi i8 addrspace(1)*
; CHECK-DAG: %outer-loop ]
; CHECK-DAG: [ %arg1.relocated, %inner-loop ]
; CHECK: gc.statepoint
; CHECK: %arg1.relocated
; CHECK: %arg2.relocated
%safepoint_token = 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 2, i8 addrspace(1)* %arg1, i8 addrspace(1)* %arg2)
br i1 %cmp, label %inner-loop, label %outer-inc
outer-inc:
; CHECK-LABEL: outer-inc:
br label %outer-loop
}
; This test shows why updating just those uses of the original value being
; relocated dominated by the inserted relocation is not always sufficient.
define i64 addrspace(1)* @test7(i64 addrspace(1)* %obj, i64 addrspace(1)* %obj2, i1 %condition) gc "statepoint-example" {
; CHECK-LABEL: @test7
entry:
br i1 %condition, label %branch2, label %join
branch2:
br i1 %condition, label %callbb, label %join2
callbb:
%safepoint_token = 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)
br label %join
join:
; CHECK-LABEL: join:
; CHECK: phi i64 addrspace(1)* [ %obj.relocated.casted, %callbb ], [ %obj, %entry ]
; CHECK: phi i64 addrspace(1)*
; CHECK-DAG: [ %obj, %entry ]
; CHECK-DAG: [ %obj2.relocated.casted, %callbb ]
; This is a phi outside the dominator region of the new defs inserted by
; the safepoint, BUT we can't stop the search here or we miss the second
; phi below.
%phi1 = phi i64 addrspace(1)* [ %obj, %entry ], [ %obj2, %callbb ]
br label %join2
join2:
; CHECK-LABEL: join2:
; CHECK: phi2 = phi i64 addrspace(1)*
; CHECK-DAG: %join ]
; CHECK-DAG: [ %obj2, %branch2 ]
%phi2 = phi i64 addrspace(1)* [ %obj, %join ], [ %obj2, %branch2 ]
ret i64 addrspace(1)* %phi2
}
declare void @do_safepoint()
declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
declare token @llvm.experimental.gc.statepoint.p0f_p1i8f(i64, i32, i8 addrspace(1)* ()*, i32, i32, ...)
declare token @llvm.experimental.gc.statepoint.p0f_isVoidi64f(i64, i32, void (i64)*, i32, i32, ...)
declare token @llvm.experimental.gc.statepoint.p0f_i32p1i64f(i64, i32, i32 (i64 addrspace(1)*)*, i32, i32, ...)
declare i8 addrspace(1)* @llvm.experimental.gc.result.p1i8(token) #3
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