mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2026-04-27 04:18:42 +00:00
Pat Gavlin
5c7f7462e4
This changes the shape of the statepoint intrinsic from:
@llvm.experimental.gc.statepoint(anyptr target, i32 # call args, i32 unused, ...call args, i32 # deopt args, ...deopt args, ...gc args)
to:
@llvm.experimental.gc.statepoint(anyptr target, i32 # call args, i32 flags, ...call args, i32 # transition args, ...transition args, i32 # deopt args, ...deopt args, ...gc args)
This extension offers the backend the opportunity to insert (somewhat) arbitrary code to manage the transition from GC-aware code to code that is not GC-aware and back.
In order to support the injection of transition code, this extension wraps the STATEPOINT ISD node generated by the usual lowering lowering with two additional nodes: GC_TRANSITION_START and GC_TRANSITION_END. The transition arguments that were passed passed to the intrinsic (if any) are lowered and provided as operands to these nodes and may be used by the backend during code generation.
Eventually, the lowering of the GC_TRANSITION_{START,END} nodes should be informed by the GC strategy in use for the function containing the intrinsic call; for now, these nodes are instead replaced with no-ops.
Differential Revision: http://reviews.llvm.org/D9501
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236888 91177308-0d34-0410-b5e6-96231b3b80d8
22 lines
1.1 KiB
LLVM
22 lines
1.1 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
|
|
|
|
; Uses InstCombine with DataLayout to propagate dereferenceable
|
|
; attribute via gc.relocate: if the derived ptr is dereferenceable(N),
|
|
; then the return attribute of gc.relocate is dereferenceable(N).
|
|
|
|
declare zeroext i1 @return_i1()
|
|
declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()*, i32, i32, ...)
|
|
declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)
|
|
|
|
define i32 addrspace(1)* @deref(i32 addrspace(1)* dereferenceable(8) %dparam) gc "statepoint-example" {
|
|
; Checks that a dereferenceabler pointer
|
|
; CHECK-LABEL: @deref
|
|
; CHECK: call dereferenceable(8)
|
|
entry:
|
|
%load = load i32, i32 addrspace(1)* %dparam
|
|
%tok = tail call i32 (i1 ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()* @return_i1, i32 0, i32 0, i32 0, i32 0, i32 addrspace(1)* %dparam)
|
|
%relocate = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %tok, i32 5, i32 5)
|
|
ret i32 addrspace(1)* %relocate
|
|
}
|