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teak-llvm/llvm/test/Transforms/RewriteStatepointsForGC/base-vector.ll
Chen Li d71999ef1b [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 -S | FileCheck %s
define i64 addrspace(1)* @test(<2 x i64 addrspace(1)*> %vec, i32 %idx) gc "statepoint-example" {
; CHECK-LABEL: @test
; CHECK: extractelement
; CHECK: extractelement
; CHECK: statepoint
; CHECK: gc.relocate
; CHECK-DAG: ; (%base_ee, %base_ee)
; CHECK: gc.relocate
; CHECK-DAG: ; (%base_ee, %obj)
; Note that the second extractelement is actually redundant here. A correct output would
; be to reuse the existing obj as a base since it is actually a base pointer.
entry:
%obj = extractelement <2 x i64 addrspace(1)*> %vec, i32 %idx
%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)
ret i64 addrspace(1)* %obj
}
define i64 addrspace(1)* @test2(<2 x i64 addrspace(1)*>* %ptr, i1 %cnd, i32 %idx1, i32 %idx2)
gc "statepoint-example" {
; CHECK-LABEL: test2
entry:
br i1 %cnd, label %taken, label %untaken
taken:
%obja = load <2 x i64 addrspace(1)*>, <2 x i64 addrspace(1)*>* %ptr
br label %merge
untaken:
%objb = load <2 x i64 addrspace(1)*>, <2 x i64 addrspace(1)*>* %ptr
br label %merge
merge:
%vec = phi <2 x i64 addrspace(1)*> [%obja, %taken], [%objb, %untaken]
br i1 %cnd, label %taken2, label %untaken2
taken2:
%obj0 = extractelement <2 x i64 addrspace(1)*> %vec, i32 %idx1
br label %merge2
untaken2:
%obj1 = extractelement <2 x i64 addrspace(1)*> %vec, i32 %idx2
br label %merge2
merge2:
; CHECK-LABEL: merge2:
; CHECK-NEXT: %obj = phi i64 addrspace(1)*
; CHECK-NEXT: statepoint
; CHECK: gc.relocate
; CHECK-DAG: ; (%obj, %obj)
%obj = phi i64 addrspace(1)* [%obj0, %taken2], [%obj1, %untaken2]
%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)
ret i64 addrspace(1)* %obj
}
define i64 addrspace(1)* @test3(i64 addrspace(1)* %ptr)
gc "statepoint-example" {
; CHECK-LABEL: test3
entry:
%vec = insertelement <2 x i64 addrspace(1)*> undef, i64 addrspace(1)* %ptr, i32 0
%obj = extractelement <2 x i64 addrspace(1)*> %vec, i32 0
; CHECK: insertelement
; CHECK: extractelement
; CHECK: statepoint
; CHECK: gc.relocate
; CHECK-DAG: (%obj, %obj)
%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)
ret i64 addrspace(1)* %obj
}
define i64 addrspace(1)* @test4(i64 addrspace(1)* %ptr)
gc "statepoint-example" {
; CHECK-LABEL: test4
entry:
%derived = getelementptr i64, i64 addrspace(1)* %ptr, i64 16
%veca = insertelement <2 x i64 addrspace(1)*> undef, i64 addrspace(1)* %derived, i32 0
%vec = insertelement <2 x i64 addrspace(1)*> %veca, i64 addrspace(1)* %ptr, i32 1
%obj = extractelement <2 x i64 addrspace(1)*> %vec, i32 0
; CHECK: statepoint
; CHECK: gc.relocate
; CHECK-DAG: ; (%ptr, %obj)
; CHECK: gc.relocate
; CHECK-DAG: ; (%ptr, %ptr)
%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)
ret i64 addrspace(1)* %obj
}
declare void @use(i64 addrspace(1)*)
; When we can optimize an extractelement from a known
; index and avoid introducing new base pointer instructions
define void @test5(i1 %cnd, i64 addrspace(1)* %obj)
gc "statepoint-example" {
; CHECK-LABEL: @test5
; CHECK: gc.relocate
; CHECK-DAG: (%obj, %bdv)
entry:
%gep = getelementptr i64, i64 addrspace(1)* %obj, i64 1
%vec = insertelement <2 x i64 addrspace(1)*> undef, i64 addrspace(1)* %gep, i32 0
%bdv = extractelement <2 x i64 addrspace(1)*> %vec, i32 0
%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 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
call void @use(i64 addrspace(1)* %bdv)
ret void
}
; When we fundementally have to duplicate
define void @test6(i1 %cnd, i64 addrspace(1)* %obj, i64 %idx)
gc "statepoint-example" {
; CHECK-LABEL: @test6
; CHECK: %gep = getelementptr i64, i64 addrspace(1)* %obj, i64 1
; CHECK: %vec.base = insertelement <2 x i64 addrspace(1)*> undef, i64 addrspace(1)* %obj, i32 0, !is_base_value !0
; CHECK: %vec = insertelement <2 x i64 addrspace(1)*> undef, i64 addrspace(1)* %gep, i32 0
; CHECK: %bdv.base = extractelement <2 x i64 addrspace(1)*> %vec.base, i64 %idx, !is_base_value !0
; CHECK: %bdv = extractelement <2 x i64 addrspace(1)*> %vec, i64 %idx
; CHECK: gc.statepoint
; CHECK: gc.relocate
; CHECK-DAG: (%bdv.base, %bdv)
entry:
%gep = getelementptr i64, i64 addrspace(1)* %obj, i64 1
%vec = insertelement <2 x i64 addrspace(1)*> undef, i64 addrspace(1)* %gep, i32 0
%bdv = extractelement <2 x i64 addrspace(1)*> %vec, i64 %idx
%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 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
call void @use(i64 addrspace(1)* %bdv)
ret void
}
; A more complicated example involving vector and scalar bases.
; This is derived from a failing test case when we didn't have correct
; insertelement handling.
define i64 addrspace(1)* @test7(i1 %cnd, i64 addrspace(1)* %obj,
i64 addrspace(1)* %obj2)
gc "statepoint-example" {
; CHECK-LABEL: @test7
entry:
%vec = insertelement <2 x i64 addrspace(1)*> undef, i64 addrspace(1)* %obj2, i32 0
br label %merge1
merge1:
; CHECK-LABEL: merge1:
; CHECK: vec2.base
; CHECK: vec2
; CHECK: gep
; CHECK: vec3.base
; CHECK: vec3
%vec2 = phi <2 x i64 addrspace(1)*> [ %vec, %entry ], [ %vec3, %merge1 ]
%gep = getelementptr i64, i64 addrspace(1)* %obj2, i64 1
%vec3 = insertelement <2 x i64 addrspace(1)*> undef, i64 addrspace(1)* %gep, i32 0
br i1 %cnd, label %merge1, label %next1
next1:
; CHECK-LABEL: next1:
; CHECK: bdv.base =
; CHECK: bdv =
%bdv = extractelement <2 x i64 addrspace(1)*> %vec2, i32 0
br label %merge
merge:
; CHECK-LABEL: merge:
; CHECK: %objb.base
; CHECK: %objb
; CHECK: gc.statepoint
; CHECK: gc.relocate
; CHECK-DAG: (%objb.base, %objb)
%objb = phi i64 addrspace(1)* [ %obj, %next1 ], [ %bdv, %merge ]
br i1 %cnd, label %merge, label %next
next:
%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 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
ret i64 addrspace(1)* %objb
}
declare void @do_safepoint()
declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
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