llvm/test/CodeGen/X86/statepoint-live-in.ll

; RUN: llc -O3 < %s | FileCheck %s
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.11.0"

declare void @bar() #0
declare void @baz()

define void @test1(i32 %a) gc "statepoint-example" {
entry:
; We expect the argument to be passed in an extra register to bar
; CHECK-LABEL: test1
; CHECK:       pushq	%rax
; CHECK-NEXT: Ltmp0:
; CHECK-NEXT:  .cfi_def_cfa_offset 16
; CHECK-NEXT: callq	_bar
  %statepoint_token1 = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @bar, i32 0, i32 2, i32 0, i32 1, i32 %a)
  ret void
}

define void @test2(i32 %a, i32 %b) gc "statepoint-example" {
entry:
; Because the first call clobbers esi, we have to move the values into
; new registers.  Note that they stay in the registers for both calls.
; CHECK-LABEL: @test2
; CHECK:       movl	%esi, %ebx
; CHECK-NEXT:  movl	%edi, %ebp
; CHECK-NEXT: callq	_bar
  call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @bar, i32 0, i32 2, i32 0, i32 2, i32 %a, i32 %b)
  call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @bar, i32 0, i32 2, i32 0, i32 2, i32 %b, i32 %a)
  ret void
}

define void @test3(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h, i32 %i) gc "statepoint-example" {
entry:
; TODO: We should have folded the reload into the statepoint.
; CHECK-LABEL: @test3
; CHECK:       	movl	32(%rsp), %r10d
; CHECK-NEXT: 	movl	24(%rsp), %r11d
; CHECK-NEXT:   movl	16(%rsp), %eax
; CHECK-NEXT:   callq	_bar
  %statepoint_token1 = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @bar, i32 0, i32 2, i32 0, i32 9, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h, i32 %i)
  ret void
}

; This case just confirms that we don't crash when given more live values
; than registers.  This is a case where we *have* to use a stack slot.
define void @test4(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h, i32 %i, i32 %j, i32 %k, i32 %l, i32 %m, i32 %n, i32 %o, i32 %p, i32 %q, i32 %r, i32 %s, i32 %t, i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z) gc "statepoint-example" {
entry:
; TODO: We should have folded the reload into the statepoint.  
; CHECK-LABEL: test4
; CHECK: pushq %r15
; CHECK: pushq %r14
; CHECK: pushq %r13
; CHECK: pushq %r12
; CHECK: pushq %rbx
; CHECK: pushq %rax
; CHECK:       	movl	128(%rsp), %r13d
; CHECK-NEXT:   movl	120(%rsp), %r12d
; CHECK-NEXT:   movl	112(%rsp), %r15d
; CHECK-NEXT:   movl	104(%rsp), %r14d
; CHECK-NEXT:   movl	96(%rsp), %ebp
; CHECK-NEXT:   movl	88(%rsp), %ebx
; CHECK-NEXT:   movl	80(%rsp), %r11d
; CHECK-NEXT:   movl	72(%rsp), %r10d
; CHECK-NEXT:   movl	64(%rsp), %eax
; CHECK-NEXT:   callq	_bar
  %statepoint_token1 = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @bar, i32 0, i32 2, i32 0, i32 26, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h, i32 %i, i32 %j, i32 %k, i32 %l, i32 %m, i32 %n, i32 %o, i32 %p, i32 %q, i32 %r, i32 %s, i32 %t, i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z)
  ret void
}

; A live-through gc-value must be spilled even if it is also a live-in deopt
; value.  For live-in, we could technically report the register copy, but from
; a code quality perspective it's better to reuse the required stack slot so 
; as to put less stress on the register allocator for no benefit.
define  i32 addrspace(1)* @test5(i32 %a, i32 addrspace(1)* %p) gc "statepoint-example" {
entry:
; CHECK-LABEL: test5
; CHECK:        movq	%rsi, (%rsp)
; CHECK-NEXT:   callq	_bar
  %token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @bar, i32 0, i32 2, i32 0, i32 1, i32 %a, i32 addrspace(1)* %p, i32 addrspace(1)* %p)
  %p2 = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(token %token,  i32 9, i32 9)
  ret i32 addrspace(1)* %p2
}

; Show the interaction of live-through spilling followed by live-in.
define void @test6(i32 %a) gc "statepoint-example" {
entry:
; TODO: We could have reused the previous spill slot at zero additional cost.
; CHECK-LABEL: test6
; CHECK:        movl %edi, %ebx
; CHECK:        movl %ebx, 12(%rsp)
; CHECK-NEXT:   callq	_baz
; CHECK-NEXT:  Ltmp30:
; CHECK-NEXT:   callq	_bar
  call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @baz, i32 0, i32 0, i32 0, i32 1, i32 %a)
  call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @bar, i32 0, i32 2, i32 0, i32 1, i32 %a)
  ret void
}


; CHECK: Ltmp1-_test1
; CHECK:      .byte	1
; CHECK-NEXT: .byte	4
; CHECK-NEXT: .short	5
; CHECK-NEXT: .long	0

; CHECK: Ltmp7-_test2
; CHECK:      .byte	1
; CHECK-NEXT: .byte	4
; CHECK-NEXT: .short	6
; CHECK-NEXT: .long	0
; CHECK:      .byte	1
; CHECK-NEXT: .byte	4
; CHECK-NEXT: .short	3
; CHECK-NEXT: .long	0
; CHECK: Ltmp8-_test2
; CHECK:      .byte	1
; CHECK-NEXT: .byte	4
; CHECK-NEXT: .short	3
; CHECK-NEXT: .long	0
; CHECK:      .byte	1
; CHECK-NEXT: .byte	4
; CHECK-NEXT: .short	6
; CHECK-NEXT: .long	0

declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(token, i32, i32)


attributes #0 = { "deopt-lowering"="live-in" }
attributes #1 = { "deopt-lowering"="live-through" }