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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
38 lines
1.7 KiB
LLVM
38 lines
1.7 KiB
LLVM
; RUN: opt %s -rewrite-statepoints-for-gc -spp-print-base-pointers -S 2>&1 | FileCheck %s
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; CHECK: derived %next_element_ptr base %array_obj
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define i32 @null_in_array(i64 addrspace(1)* %array_obj) gc "statepoint-example" {
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entry:
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%array_len_pointer.i64 = getelementptr i64, i64 addrspace(1)* %array_obj, i32 1
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%array_len_pointer.i32 = bitcast i64 addrspace(1)* %array_len_pointer.i64 to i32 addrspace(1)*
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%array_len = load i32, i32 addrspace(1)* %array_len_pointer.i32
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%array_elems = bitcast i32 addrspace(1)* %array_len_pointer.i32 to i64 addrspace(1)* addrspace(1)*
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br label %loop_check
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loop_check:
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%index = phi i32 [ 0, %entry ], [ %next_index, %loop_back ]
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%current_element_ptr = phi i64 addrspace(1)* addrspace(1)* [ %array_elems, %entry ], [ %next_element_ptr, %loop_back ]
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%index_lt = icmp ult i32 %index, %array_len
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br i1 %index_lt, label %check_for_null, label %not_found
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check_for_null:
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%current_element = load i64 addrspace(1)*, i64 addrspace(1)* addrspace(1)* %current_element_ptr
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%is_null = icmp eq i64 addrspace(1)* %current_element, null
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br i1 %is_null, label %found, label %loop_back
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loop_back:
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%next_element_ptr = getelementptr i64 addrspace(1)*, i64 addrspace(1)* addrspace(1)* %current_element_ptr, i32 1
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%next_index = add i32 %index, 1
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%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)
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br label %loop_check
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not_found:
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ret i32 -1
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found:
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ret i32 %index
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}
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declare void @do_safepoint()
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...) |