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[Greedy RegAlloc] Add a test for single block split with statepoint uses. 

The test shows redundant usage of callee saved register in case
basic block has only one non-statepoint use.
This commit is contained in:
Serguei Katkov 2022-11-07 14:37:54 +07:00
parent 05a113e188
commit c40ef64462
1 changed files with 81 additions and 0 deletions
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llvm/test/CodeGen/X86/statepoint-split-single-block.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -max-registers-for-gc-values=256 -use-registers-for-deopt-values=true -code-model=large -fixup-allow-gcptr-in-csr=true < %s | FileCheck %s
; The test checks that Greedy register allocator should not split single basic block
; if it has only one non-statepoint use. Otherwise we may a redundant register usage.
target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-win64"
define ptr addrspace(1) @foo(ptr addrspace(1) %arg) gc "statepoint-example" {
; CHECK-LABEL: foo:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq %rbp
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: pushq %r15
; CHECK-NEXT: .cfi_def_cfa_offset 24
; CHECK-NEXT: pushq %r14
; CHECK-NEXT: .cfi_def_cfa_offset 32
; CHECK-NEXT: pushq %r13
; CHECK-NEXT: .cfi_def_cfa_offset 40
; CHECK-NEXT: pushq %r12
; CHECK-NEXT: .cfi_def_cfa_offset 48
; CHECK-NEXT: pushq %rbx
; CHECK-NEXT: .cfi_def_cfa_offset 56
; CHECK-NEXT: pushq %rax
; CHECK-NEXT: .cfi_def_cfa_offset 64
; CHECK-NEXT: .cfi_offset %rbx, -56
; CHECK-NEXT: .cfi_offset %r12, -48
; CHECK-NEXT: .cfi_offset %r13, -40
; CHECK-NEXT: .cfi_offset %r14, -32
; CHECK-NEXT: .cfi_offset %r15, -24
; CHECK-NEXT: .cfi_offset %rbp, -16
; CHECK-NEXT: movq %rdi, (%rsp) # 8-byte Spill
; CHECK-NEXT: movabsq $nocsr, %rax
; CHECK-NEXT: callq *%rax
; CHECK-NEXT: movabsq $bar, %rax
; CHECK-NEXT: movq (%rsp), %rbx # 8-byte Reload
; CHECK-NEXT: movq %rbx, %rdi
; CHECK-NEXT: callq *%rax
; CHECK-NEXT: .Ltmp0:
; CHECK-NEXT: movq %rbx, (%rsp) # 8-byte Spill
; CHECK-NEXT: movabsq $nocsr, %rax
; CHECK-NEXT: callq *%rax
; CHECK-NEXT: movq (%rsp), %rax # 8-byte Reload
; CHECK-NEXT: addq $8, %rsp
; CHECK-NEXT: .cfi_def_cfa_offset 56
; CHECK-NEXT: popq %rbx
; CHECK-NEXT: .cfi_def_cfa_offset 48
; CHECK-NEXT: popq %r12
; CHECK-NEXT: .cfi_def_cfa_offset 40
; CHECK-NEXT: popq %r13
; CHECK-NEXT: .cfi_def_cfa_offset 32
; CHECK-NEXT: popq %r14
; CHECK-NEXT: .cfi_def_cfa_offset 24
; CHECK-NEXT: popq %r15
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: popq %rbp
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: retq
entry:
; force spill %arg on stack.
call void @nocsr()
br label %do_call
do_call:
; Basic block with two use intructions inside:
; copy to rdi as an argument to call and use in statepoint instruction as gc-live and deopt value.
%statepoint_token = call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 2882400000, i32 0, ptr elementtype(void (ptr addrspace(1))) @bar, i32 1, i32 0, ptr addrspace(1) %arg, i32 0, i32 0) [ "deopt"(ptr addrspace(1) %arg), "gc-live"(ptr addrspace(1) %arg) ]
%arg.reloc = call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %statepoint_token, i32 0, i32 0)
br label %next
next:
; force spill %arg.reloc on stack.
call void @nocsr()
ret ptr addrspace(1) %arg.reloc
}
declare void @nocsr() "no_callee_saved_registers"
declare void @bar(ptr addrspace(1))
declare token @llvm.experimental.gc.statepoint.p0(i64 immarg, i32 immarg, ptr, i32 immarg, i32 immarg, ...)
declare ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token, i32 immarg, i32 immarg)