0e7c77053f
Currently, gc.relocates are defined in terms of indices into the statepoint's operand list. Given the gc args are at the end of a variable length list of operands, this makes interpreting their indices by hand a tad challenging. We can simplify the statepoint sequence and improve readability quite a bit by pulling these new operands into their own named operand bundle. This patch defines a new operand bundle tag "gc-live". The semantics of the bundle are the same as the existing gc arguments of a statepoint. This patch simply introduces the definition and codegen for the bundle, future patches will migrate RS4GC to emitting the new form. Interestingly, with this done and the recent migration to using deopt and gc-transition bundles, we really don't have much left in the statepoint itself. It really looks like the existing ID and flags fields are redundant; we have (existing!) attributes for all of them. I think we'll be able to reduce the gc.statepoint signature to simply a wrapped call (e.g. actual target and actual arguments). Differential Revision: https://reviews.llvm.org/D80937
83 lines
3.1 KiB
LLVM
83 lines
3.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -verify-machineinstrs < %s | FileCheck %s
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target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-win64"
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declare void @foo()
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define void @test_empty() gc "statepoint-example" {
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; CHECK-LABEL: test_empty:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: callq foo
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; CHECK-NEXT: .Ltmp0:
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; CHECK-NEXT: popq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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entry:
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%token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0) ["gc-live" ()]
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ret void
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}
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define void @test_dead(i8 addrspace(1)* %p) gc "statepoint-example" {
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; CHECK-LABEL: test_dead:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: callq foo
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; CHECK-NEXT: .Ltmp1:
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; CHECK-NEXT: popq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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entry:
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%token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0) ["gc-live" (i8 addrspace(1)* %p)]
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ret void
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}
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define i8 addrspace(1)* @test_one(i8 addrspace(1)* %p) gc "statepoint-example" {
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; CHECK-LABEL: test_one:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: movq %rdi, (%rsp)
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; CHECK-NEXT: callq foo
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; CHECK-NEXT: .Ltmp2:
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; CHECK-NEXT: movq (%rsp), %rax
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; CHECK-NEXT: popq %rcx
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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entry:
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%token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0) ["gc-live" (i8 addrspace(1)* %p)]
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%p2 = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %token, i32 0, i32 0)
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ret i8 addrspace(1)* %p2
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}
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define i8 addrspace(1)* @test_one_derived(i8 addrspace(1)* %p) gc "statepoint-example" {
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; CHECK-LABEL: test_one_derived:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: subq $24, %rsp
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; CHECK-NEXT: .cfi_def_cfa_offset 32
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; CHECK-NEXT: movq %rdi, {{[0-9]+}}(%rsp)
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; CHECK-NEXT: addq $8, %rdi
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; CHECK-NEXT: movq %rdi, {{[0-9]+}}(%rsp)
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; CHECK-NEXT: callq foo
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; CHECK-NEXT: .Ltmp3:
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; CHECK-NEXT: movq {{[0-9]+}}(%rsp), %rax
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; CHECK-NEXT: addq $24, %rsp
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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entry:
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%gep = getelementptr i8, i8 addrspace(1)* %p, i32 8
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%token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0) ["gc-live" (i8 addrspace(1)* %p, i8 addrspace(1)* %gep)]
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%gep2 = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %token, i32 0, i32 1)
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ret i8 addrspace(1)* %gep2
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}
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
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declare i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token, i32, i32)
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