587fa99cfd
Continues from D80598. The key point of the change is to default to using operand bundles instead of the inline length prefix argument lists for statepoint nodes. An important subtlety to note is that the presence of a bundle has semantic meaning, even if it is empty. As such, we need to make a somewhat deeper change to the interface than is first obvious. Existing code treats statepoint deopt arguments and the deopt bundle operands differently during inlining. The former is ignored (resulting in caller state being dropped), the later is merged. We can't preserve the old behaviour for calls with deopt fed to RS4GC and then inlining, but we can avoid the no-deopt case changing. At least in internal testing, that seem to be the important one. (I'd argue the "stop merging after RS4GC" behaviour for the former was always "unexpected", but that the behaviour for non-deopt calls actually make sense.) Differential Revision: https://reviews.llvm.org/D80674
71 lines
4.0 KiB
LLVM
71 lines
4.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -rewrite-statepoints-for-gc -spp-print-base-pointers -S 2>&1 | FileCheck %s
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; RUN: opt < %s -passes=rewrite-statepoints-for-gc -spp-print-base-pointers -S 2>&1 | FileCheck %s
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; CHECK: derived %obj_to_consume base %obj_to_consume.base
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declare void @foo()
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declare i64 addrspace(1)* @generate_obj()
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declare void @consume_obj(i64 addrspace(1)*)
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define void @test(i32 %condition) gc "statepoint-example" {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[STATEPOINT_TOKEN:%.*]] = call token (i64, i32, i64 addrspace(1)* ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_p1i64f(i64 2882400000, i32 0, i64 addrspace(1)* ()* @generate_obj, i32 0, i32 0, i32 0, i32 0) [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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; CHECK-NEXT: [[TMP0:%.*]] = call i64 addrspace(1)* @llvm.experimental.gc.result.p1i64(token [[STATEPOINT_TOKEN]])
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; CHECK-NEXT: switch i32 [[CONDITION:%.*]], label [[DEST_A:%.*]] [
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; CHECK-NEXT: i32 0, label [[DEST_B:%.*]]
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; CHECK-NEXT: i32 1, label [[DEST_C:%.*]]
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; CHECK-NEXT: ]
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; CHECK: dest_a:
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; CHECK-NEXT: br label [[MERGE:%.*]]
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; CHECK: dest_b:
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; CHECK-NEXT: br label [[MERGE]]
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; CHECK: dest_c:
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; CHECK-NEXT: br label [[MERGE]]
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; CHECK: merge:
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; CHECK-NEXT: [[OBJ_TO_CONSUME_BASE:%.*]] = phi i64 addrspace(1)* [ [[TMP0]], [[DEST_A]] ], [ null, [[DEST_B]] ], [ null, [[DEST_C]] ], !is_base_value !0
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; CHECK-NEXT: [[OBJ_TO_CONSUME:%.*]] = phi i64 addrspace(1)* [ [[TMP0]], [[DEST_A]] ], [ null, [[DEST_B]] ], [ null, [[DEST_C]] ]
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; CHECK-NEXT: [[STATEPOINT_TOKEN1:%.*]] = call token (i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64 2882400000, i32 0, void (i64 addrspace(1)*)* @consume_obj, i32 1, i32 0, i64 addrspace(1)* [[OBJ_TO_CONSUME]], i32 0, i32 0, i64 addrspace(1)* [[OBJ_TO_CONSUME_BASE]], i64 addrspace(1)* [[OBJ_TO_CONSUME]]) [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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; CHECK-NEXT: [[OBJ_TO_CONSUME_BASE_RELOCATED:%.*]] = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token [[STATEPOINT_TOKEN1]], i32 8, i32 8)
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; CHECK-NEXT: [[OBJ_TO_CONSUME_BASE_RELOCATED_CASTED:%.*]] = bitcast i8 addrspace(1)* [[OBJ_TO_CONSUME_BASE_RELOCATED]] to i64 addrspace(1)*
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; CHECK-NEXT: [[OBJ_TO_CONSUME_RELOCATED:%.*]] = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token [[STATEPOINT_TOKEN1]], i32 8, i32 9)
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; CHECK-NEXT: [[OBJ_TO_CONSUME_RELOCATED_CASTED:%.*]] = bitcast i8 addrspace(1)* [[OBJ_TO_CONSUME_RELOCATED]] to i64 addrspace(1)*
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; CHECK-NEXT: br label [[MERGE_SPLIT:%.*]]
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; CHECK: merge.split:
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; CHECK-NEXT: [[STATEPOINT_TOKEN2:%.*]] = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0) [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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; CHECK-NEXT: br label [[LOOP]]
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;
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entry:
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br label %loop
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loop: ; preds = %merge.split, %entry
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%0 = call i64 addrspace(1)* @generate_obj() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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switch i32 %condition, label %dest_a [
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i32 0, label %dest_b
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i32 1, label %dest_c
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]
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dest_a: ; preds = %loop
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br label %merge
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dest_b: ; preds = %loop
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br label %merge
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dest_c: ; preds = %loop
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br label %merge
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merge: ; preds = %dest_c, %dest_b, %dest_a
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%obj_to_consume = phi i64 addrspace(1)* [ %0, %dest_a ], [ null, %dest_b ], [ null, %dest_c ]
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call void @consume_obj(i64 addrspace(1)* %obj_to_consume) [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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br label %merge.split
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merge.split: ; preds = %merge
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call void @foo() [ "deopt"(i32 0, i32 -1, i32 0, i32 0, i32 0) ]
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br label %loop
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}
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