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llvm/test/Transforms/RewriteStatepointsForGC/rematerialize-derived-pointers.ll
Anna Thomas 3262806b21 [StatepointsForGC] Rematerialize in the presence of PHIs 
Summary:
While walking the use chain for identifying rematerializable values in RS4GC,
add the case where the current value and base value are the same PHI nodes.

This will aid rematerialization of geps and casts instead of relocating.

Reviewers: sanjoy, reames, igor

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D23920

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279975 91177308-0d34-0410-b5e6-96231b3b80d8
2016-08-29 15:41:59 +00:00

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LLVM
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; RUN: opt < %s -rewrite-statepoints-for-gc -S | FileCheck %s
declare void @use_obj16(i16 addrspace(1)*) "gc-leaf-function"
declare void @use_obj32(i32 addrspace(1)*) "gc-leaf-function"
declare void @use_obj64(i64 addrspace(1)*) "gc-leaf-function"
declare void @do_safepoint()
define void @test_gep_const(i32 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_gep_const
entry:
%ptr = getelementptr i32, i32 addrspace(1)* %base, i32 15
; CHECK: getelementptr i32, i32 addrspace(1)* %base, i32 15
call void @do_safepoint() [ "deopt"() ]
; CHECK: %base.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %statepoint_token, i32 7, i32 7)
; CHECK: bitcast i8 addrspace(1)* %base.relocated to i32 addrspace(1)*
; CHECK: getelementptr i32, i32 addrspace(1)* %base.relocated.casted, i32 15
call void @use_obj32(i32 addrspace(1)* %base)
call void @use_obj32(i32 addrspace(1)* %ptr)
ret void
}
define void @test_gep_idx(i32 addrspace(1)* %base, i32 %idx) gc "statepoint-example" {
; CHECK-LABEL: test_gep_idx
entry:
%ptr = getelementptr i32, i32 addrspace(1)* %base, i32 %idx
; CHECK: getelementptr
call void @do_safepoint() [ "deopt"() ]
; CHECK: %base.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %statepoint_token, i32 7, i32 7)
; CHECK: %base.relocated.casted = bitcast i8 addrspace(1)* %base.relocated to i32 addrspace(1)*
; CHECK: getelementptr i32, i32 addrspace(1)* %base.relocated.casted, i32 %idx
call void @use_obj32(i32 addrspace(1)* %base)
call void @use_obj32(i32 addrspace(1)* %ptr)
ret void
}
define void @test_bitcast(i32 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_bitcast
entry:
%ptr = bitcast i32 addrspace(1)* %base to i64 addrspace(1)*
; CHECK: bitcast i32 addrspace(1)* %base to i64 addrspace(1)*
call void @do_safepoint() [ "deopt"() ]
; CHECK: %base.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %statepoint_token, i32 7, i32 7)
; CHECK: %base.relocated.casted = bitcast i8 addrspace(1)* %base.relocated to i32 addrspace(1)*
; CHECK: bitcast i32 addrspace(1)* %base.relocated.casted to i64 addrspace(1)*
call void @use_obj32(i32 addrspace(1)* %base)
call void @use_obj64(i64 addrspace(1)* %ptr)
ret void
}
define void @test_bitcast_bitcast(i32 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_bitcast_bitcast
entry:
%ptr1 = bitcast i32 addrspace(1)* %base to i64 addrspace(1)*
%ptr2 = bitcast i64 addrspace(1)* %ptr1 to i16 addrspace(1)*
; CHECK: bitcast i32 addrspace(1)* %base to i64 addrspace(1)*
; CHECK: bitcast i64 addrspace(1)* %ptr1 to i16 addrspace(1)*
call void @do_safepoint() [ "deopt"() ]
; CHECK: %base.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %statepoint_token, i32 7, i32 7)
; CHECK: %base.relocated.casted = bitcast i8 addrspace(1)* %base.relocated to i32 addrspace(1)*
; CHECK: bitcast i32 addrspace(1)* %base.relocated.casted to i64 addrspace(1)*
; CHECK: bitcast i64 addrspace(1)* %ptr1.remat to i16 addrspace(1)*
call void @use_obj32(i32 addrspace(1)* %base)
call void @use_obj16(i16 addrspace(1)* %ptr2)
ret void
}
define void @test_addrspacecast_addrspacecast(i32 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_addrspacecast_addrspacecast
entry:
%ptr1 = addrspacecast i32 addrspace(1)* %base to i32*
%ptr2 = addrspacecast i32* %ptr1 to i32 addrspace(1)*
; CHECK: addrspacecast i32 addrspace(1)* %base to i32*
; CHECK: addrspacecast i32* %ptr1 to i32 addrspace(1)*
call void @do_safepoint() [ "deopt"() ]
; CHECK: %ptr2.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %statepoint_token, i32 8, i32 7)
; CHECK: %ptr2.relocated.casted = bitcast i8 addrspace(1)* %ptr2.relocated to i32 addrspace(1)*
; CHECK: %base.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %statepoint_token, i32 8, i32 8)
; CHECK: %base.relocated.casted = bitcast i8 addrspace(1)* %base.relocated to i32 addrspace(1)*
call void @use_obj32(i32 addrspace(1)* %base)
call void @use_obj32(i32 addrspace(1)* %ptr2)
ret void
}
define void @test_bitcast_gep(i32 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_bitcast_gep
entry:
%ptr.gep = getelementptr i32, i32 addrspace(1)* %base, i32 15
; CHECK: getelementptr
; CHECK: bitcast i32 addrspace(1)* %ptr.gep to i64 addrspace(1)*
%ptr.cast = bitcast i32 addrspace(1)* %ptr.gep to i64 addrspace(1)*
call void @do_safepoint() [ "deopt"() ]
; CHECK: gc.relocate
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: bitcast
call void @use_obj32(i32 addrspace(1)* %base)
call void @use_obj64(i64 addrspace(1)* %ptr.cast)
ret void
}
define void @test_intersecting_chains(i32 addrspace(1)* %base, i32 %idx) gc "statepoint-example" {
; CHECK-LABEL: test_intersecting_chains
entry:
%ptr.gep = getelementptr i32, i32 addrspace(1)* %base, i32 15
; CHECK: getelementptr
%ptr.cast = bitcast i32 addrspace(1)* %ptr.gep to i64 addrspace(1)*
; CHECK: bitcast
%ptr.cast2 = bitcast i32 addrspace(1)* %ptr.gep to i16 addrspace(1)*
; CHECK: bitcast
call void @do_safepoint() [ "deopt"() ]
; CHECK: getelementptr
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: bitcast
call void @use_obj64(i64 addrspace(1)* %ptr.cast)
call void @use_obj16(i16 addrspace(1)* %ptr.cast2)
ret void
}
define void @test_cost_threshold(i32 addrspace(1)* %base, i32 %idx1, i32 %idx2, i32 %idx3) gc "statepoint-example" {
; CHECK-LABEL: test_cost_threshold
entry:
%ptr.gep = getelementptr i32, i32 addrspace(1)* %base, i32 15
; CHECK: getelementptr
%ptr.gep2 = getelementptr i32, i32 addrspace(1)* %ptr.gep, i32 %idx1
; CHECK: getelementptr
%ptr.gep3 = getelementptr i32, i32 addrspace(1)* %ptr.gep2, i32 %idx2
; CHECK: getelementptr
%ptr.gep4 = getelementptr i32, i32 addrspace(1)* %ptr.gep3, i32 %idx3
; CHECK: getelementptr
%ptr.cast = bitcast i32 addrspace(1)* %ptr.gep4 to i64 addrspace(1)*
call void @do_safepoint() [ "deopt"() ]
; CHECK: gc.relocate
; CHECK: bitcast
; CHECK: gc.relocate
; CHECK: bitcast
call void @use_obj64(i64 addrspace(1)* %ptr.cast)
ret void
}
define void @test_two_derived(i32 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_two_derived
entry:
%ptr = getelementptr i32, i32 addrspace(1)* %base, i32 15
%ptr2 = getelementptr i32, i32 addrspace(1)* %base, i32 12
; CHECK: getelementptr
; CHECK: getelementptr
call void @do_safepoint() [ "deopt"() ]
; CHECK: gc.relocate
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: getelementptr
call void @use_obj32(i32 addrspace(1)* %ptr)
call void @use_obj32(i32 addrspace(1)* %ptr2)
ret void
}
define void @test_gep_smallint_array([3 x i32] addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_gep_smallint_array
entry:
%ptr = getelementptr [3 x i32], [3 x i32] addrspace(1)* %base, i32 0, i32 2
; CHECK: getelementptr
call void @do_safepoint() [ "deopt"() ]
; CHECK: gc.relocate
; CHECK: bitcast
; CHECK: getelementptr
call void @use_obj32(i32 addrspace(1)* %ptr)
ret void
}
declare i32 @fake_personality_function()
define void @test_invoke(i32 addrspace(1)* %base) gc "statepoint-example" personality i32 ()* @fake_personality_function {
; CHECK-LABEL: test_invoke
entry:
%ptr.gep = getelementptr i32, i32 addrspace(1)* %base, i32 15
; CHECK: getelementptr
%ptr.cast = bitcast i32 addrspace(1)* %ptr.gep to i64 addrspace(1)*
; CHECK: bitcast
%ptr.cast2 = bitcast i32 addrspace(1)* %ptr.gep to i16 addrspace(1)*
; CHECK: bitcast
invoke void @do_safepoint() [ "deopt"() ]
to label %normal unwind label %exception
normal:
; CHECK: normal:
; CHECK: gc.relocate
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: bitcast
call void @use_obj64(i64 addrspace(1)* %ptr.cast)
call void @use_obj16(i16 addrspace(1)* %ptr.cast2)
ret void
exception:
; CHECK: exception:
%landing_pad4 = landingpad token
cleanup
; CHECK: gc.relocate
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: bitcast
call void @use_obj64(i64 addrspace(1)* %ptr.cast)
call void @use_obj16(i16 addrspace(1)* %ptr.cast2)
ret void
}
define void @test_loop(i32 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_loop
entry:
%ptr.gep = getelementptr i32, i32 addrspace(1)* %base, i32 15
; CHECK: getelementptr
br label %loop
loop: ; preds = %loop, %entry
; CHECK: phi i32 addrspace(1)* [ %ptr.gep, %entry ], [ %ptr.gep.remat, %loop ]
; CHECK: phi i32 addrspace(1)* [ %base, %entry ], [ %base.relocated.casted, %loop ]
call void @use_obj32(i32 addrspace(1)* %ptr.gep)
call void @do_safepoint() [ "deopt"() ]
; CHECK: gc.relocate
; CHECK: bitcast
; CHECK: getelementptr
br label %loop
}
define void @test_too_long(i32 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: test_too_long
entry:
%ptr.gep = getelementptr i32, i32 addrspace(1)* %base, i32 15
%ptr.gep1 = getelementptr i32, i32 addrspace(1)* %ptr.gep, i32 15
%ptr.gep2 = getelementptr i32, i32 addrspace(1)* %ptr.gep1, i32 15
%ptr.gep3 = getelementptr i32, i32 addrspace(1)* %ptr.gep2, i32 15
%ptr.gep4 = getelementptr i32, i32 addrspace(1)* %ptr.gep3, i32 15
%ptr.gep5 = getelementptr i32, i32 addrspace(1)* %ptr.gep4, i32 15
%ptr.gep6 = getelementptr i32, i32 addrspace(1)* %ptr.gep5, i32 15
%ptr.gep7 = getelementptr i32, i32 addrspace(1)* %ptr.gep6, i32 15
%ptr.gep8 = getelementptr i32, i32 addrspace(1)* %ptr.gep7, i32 15
%ptr.gep9 = getelementptr i32, i32 addrspace(1)* %ptr.gep8, i32 15
%ptr.gep10 = getelementptr i32, i32 addrspace(1)* %ptr.gep9, i32 15
%ptr.gep11 = getelementptr i32, i32 addrspace(1)* %ptr.gep10, i32 15
call void @do_safepoint() [ "deopt"() ]
; CHECK: gc.relocate
; CHECK: bitcast
; CHECK: gc.relocate
; CHECK: bitcast
call void @use_obj32(i32 addrspace(1)* %ptr.gep11)
ret void
}
declare i32 addrspace(1)* @new_instance() nounwind "gc-leaf-function"
; remat the gep in presence of base pointer which is a phi node.
; FIXME: We should remove the extra basephi.base as well.
define void @contains_basephi(i1 %cond) gc "statepoint-example" {
; CHECK-LABEL: contains_basephi
entry:
%base1 = call i32 addrspace(1)* @new_instance()
%base2 = call i32 addrspace(1)* @new_instance()
br i1 %cond, label %here, label %there
here:
br label %merge
there:
br label %merge
merge:
; CHECK: %basephi.base = phi i32 addrspace(1)* [ %base1, %here ], [ %base2, %there ], !is_base_value !0
; CHECK: %basephi = phi i32 addrspace(1)* [ %base1, %here ], [ %base2, %there ]
; CHECK: %ptr.gep = getelementptr i32, i32 addrspace(1)* %basephi, i32 15
; CHECK: %statepoint_token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint
; CHECK: %basephi.base.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %statepoint_token, i32 7, i32 7) ; (%basephi.base, %basephi.base)
; CHECK: %basephi.base.relocated.casted = bitcast i8 addrspace(1)* %basephi.base.relocated to i32 addrspace(1)*
; CHECK: %ptr.gep.remat = getelementptr i32, i32 addrspace(1)* %basephi, i32 15
; CHECK: call void @use_obj32(i32 addrspace(1)* %ptr.gep.remat)
%basephi = phi i32 addrspace(1)* [ %base1, %here ], [ %base2, %there ]
%ptr.gep = getelementptr i32, i32 addrspace(1)* %basephi, i32 15
call void @do_safepoint() ["deopt"() ]
call void @use_obj32(i32 addrspace(1)* %ptr.gep)
ret void
}
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