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llvm-mirror/test/Transforms/RewriteStatepointsForGC/base-vector.ll
Anna Thomas ded4f59371 [RS4GC] Handle ShuffleVector instruction in findBasePointer 
Summary:
This patch modifies the findBasePointer to handle the shufflevector instruction.

Tests run: RS4GC tests, local downstream tests.

Reviewers: reames, sanjoy

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D25197

llvm-svn: 283219
2016-10-04 13:48:37 +00:00

248 lines
10 KiB
LLVM
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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, %obj)
; CHECK: gc.relocate
; CHECK-DAG: ; (%base_ee, %base_ee)
; 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
call void @do_safepoint() [ "deopt"() ]
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: ; preds = %entry
%obja = load <2 x i64 addrspace(1)*>, <2 x i64 addrspace(1)*>* %ptr
br label %merge
untaken: ; preds = %entry
%objb = load <2 x i64 addrspace(1)*>, <2 x i64 addrspace(1)*>* %ptr
br label %merge
merge: ; preds = %untaken, %taken
%vec = phi <2 x i64 addrspace(1)*> [ %obja, %taken ], [ %objb, %untaken ]
br i1 %cnd, label %taken2, label %untaken2
taken2: ; preds = %merge
%obj0 = extractelement <2 x i64 addrspace(1)*> %vec, i32 %idx1
br label %merge2
untaken2: ; preds = %merge
%obj1 = extractelement <2 x i64 addrspace(1)*> %vec, i32 %idx2
br label %merge2
merge2: ; preds = %untaken2, %taken2
; CHECK-LABEL: merge2:
; CHECK: %obj.base = phi i64 addrspace(1)*
; CHECK: %obj = phi i64 addrspace(1)*
; CHECK: statepoint
; CHECK: gc.relocate
; CHECK-DAG: ; (%obj.base, %obj)
; CHECK: gc.relocate
; CHECK-DAG: ; (%obj.base, %obj.base)
%obj = phi i64 addrspace(1)* [ %obj0, %taken2 ], [ %obj1, %untaken2 ]
call void @do_safepoint() [ "deopt"() ]
ret i64 addrspace(1)* %obj
}
define i64 addrspace(1)* @test3(i64 addrspace(1)* %ptr) gc "statepoint-example" {
; CHECK-LABEL: test3
; CHECK: insertelement
; CHECK: extractelement
; CHECK: statepoint
; CHECK: gc.relocate
; CHECK-DAG: (%obj.base, %obj)
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
call void @do_safepoint() [ "deopt"() ]
ret i64 addrspace(1)* %obj
}
define i64 addrspace(1)* @test4(i64 addrspace(1)* %ptr) gc "statepoint-example" {
; CHECK-LABEL: test4
; CHECK: statepoint
; CHECK: gc.relocate
; CHECK-DAG: ; (%obj.base, %obj)
; When we can optimize an extractelement from a known
; index and avoid introducing new base pointer instructions
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
call void @do_safepoint() [ "deopt"() ]
ret i64 addrspace(1)* %obj
}
declare void @use(i64 addrspace(1)*) "gc-leaf-function"
define void @test5(i1 %cnd, i64 addrspace(1)* %obj) gc "statepoint-example" {
; CHECK-LABEL: @test5
; CHECK: gc.relocate
; CHECK-DAG: (%bdv.base, %bdv)
; When we fundementally have to duplicate
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
call void @do_safepoint() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
call void @use(i64 addrspace(1)* %bdv)
ret void
}
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)*> zeroinitializer, 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)
; 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.
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
call void @do_safepoint() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
call void @use(i64 addrspace(1)* %bdv)
ret void
}
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: ; preds = %merge1, %entry
; 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: ; preds = %merge1
; CHECK-LABEL: next1:
; CHECK: bdv.base =
; CHECK: bdv =
%bdv = extractelement <2 x i64 addrspace(1)*> %vec2, i32 0
br label %merge
merge: ; preds = %merge, %next1
; 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: ; preds = %merge
call void @do_safepoint() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
ret i64 addrspace(1)* %objb
}
; identify base for shufflevector
define void @test8(i64 addrspace(1)* %obj, i64 %idx) gc "statepoint-example" {
; CHECK-LABEL: @test8
; CHECK: %gep = getelementptr i64, i64 addrspace(1)* %obj, i64 1
; CHECK: %gep2 = getelementptr i64, i64 addrspace(1)* %obj, i64 2
; CHECK: %vec1.base = insertelement <4 x i64 addrspace(1)*> zeroinitializer, i64 addrspace(1)* %obj, i32 0, !is_base_value !0
; CHECK: %vec1 = insertelement <4 x i64 addrspace(1)*> undef, i64 addrspace(1)* %gep, i32 0
; CHECK: %vec2.base = insertelement <4 x i64 addrspace(1)*> zeroinitializer, i64 addrspace(1)* %obj, i32 2, !is_base_value !0
; CHECK: %vec2 = insertelement <4 x i64 addrspace(1)*> undef, i64 addrspace(1)* %gep2, i32 2
; CHECK: %vec.base = shufflevector <4 x i64 addrspace(1)*> %vec1.base, <4 x i64 addrspace(1)*> %vec2.base, <2 x i32> <i32 0, i32 2>, !is_base_value !0
; CHECK: %vec = shufflevector <4 x i64 addrspace(1)*> %vec1, <4 x i64 addrspace(1)*> %vec2, <2 x i32> <i32 0, i32 2>
; 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
%gep2 = getelementptr i64, i64 addrspace(1)* %obj, i64 2
%vec1 = insertelement <4 x i64 addrspace(1)*> undef, i64 addrspace(1)* %gep, i32 0
%vec2 = insertelement <4 x i64 addrspace(1)*> undef, i64 addrspace(1)* %gep2, i32 2
%vec = shufflevector <4 x i64 addrspace(1)*> %vec1, <4 x i64 addrspace(1)*> %vec2, <2 x i32> <i32 0, i32 2>
%bdv = extractelement <2 x i64 addrspace(1)*> %vec, i64 %idx
call void @do_safepoint() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
call void @use(i64 addrspace(1)* %bdv)
ret void
}
; Since the same 'base' vector is used in the shuffle operands, we do not need
; create a shufflevector base.
define void @test9(<4 x i64 addrspace(1)*> %vec1, i64 %idx) gc "statepoint-example" {
; CHECK-LABEL: @test9
; CHECK: %vec = shufflevector <4 x i64 addrspace(1)*> %vec1, <4 x i64 addrspace(1)*> %vec1, <2 x i32> <i32 0, i32 2>
; CHECK: %base_ee = extractelement <4 x i64 addrspace(1)*> %vec1, 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: (%base_ee, %bdv)
entry:
; shrinking vec1 into vec
%vec = shufflevector <4 x i64 addrspace(1)*> %vec1, <4 x i64 addrspace(1)*> %vec1, <2 x i32> <i32 0, i32 2>
%bdv = extractelement <2 x i64 addrspace(1)*> %vec, i64 %idx
call void @do_safepoint() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
call void @use(i64 addrspace(1)* %bdv)
ret void
}
; vector operand of shufflevector is a phi
define i64 addrspace(1)* @test10(i1 %cnd, i64 addrspace(1)* %obj, i64 addrspace(1)* %obj2) gc "statepoint-example" {
; CHECK-LABEL: @test10
entry:
%vec1 = insertelement <4 x i64 addrspace(1)*> undef, i64 addrspace(1)* %obj, i32 0
br i1 %cnd, label %here, label %merge
here:
%vec2 = insertelement <4 x i64 addrspace(1)*> undef, i64 addrspace(1)* %obj2, i32 2
br label %merge
merge: ; preds = %merge, %entry, %here
; CHECK-LABEL: merge:
; CHECK: %vec.base = phi <4 x i64 addrspace(1)*> [ %vec1.base, %entry ], [ %vec2.base, %here ], [ %vec3.base, %merge ], !is_base_value !0
; CHECK: vec
; CHECK: vec3.base = shufflevector <4 x i64 addrspace(1)*> %vec.base, <4 x i64 addrspace(1)*> %vec.base
; CHECK: vec3
; CHECK: bdv.base
; CHECK: bdv
%vec = phi <4 x i64 addrspace(1)*> [ %vec1, %entry ], [ %vec2, %here], [ %vec3, %merge]
%vec3 = shufflevector <4 x i64 addrspace(1)*> %vec, <4 x i64 addrspace(1)*> %vec, <4 x i32> <i32 2, i32 0, i32 1, i32 3>
%bdv = extractelement <4 x i64 addrspace(1)*> %vec3, i32 0
br i1 %cnd, label %merge, label %next
next:
; CHECK-LABEL: next:
; CHECK: gc.statepoint
; CHECK: gc.relocate
; CHECK-DAG: (%bdv.base, %bdv)
call void @do_safepoint() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
ret i64 addrspace(1)* %bdv
}
declare void @do_safepoint()
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