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llvm-mirror/test/CodeGen/X86/statepoint-live-in.ll
Philip Reames 863d1f370d [peephole] Enhance folding logic to work for STATEPOINTs 
The general idea here is to get enough of the existing restrictions out of the way that the already existing folding logic in foldMemoryOperand can kick in for STATEPOINTs and fold references to immutable stack slots. The key changes are:

    Support for folding multiple operands at once which reference the same load
    Support for folding multiple loads into a single instruction
    Walk all the operands of the instruction for varidic instructions (this is a bug fix!)

Once this lands, I'll post another patch which refactors the TII interface here. There's nothing actually x86 specific about the x86 code used here.

Differential Revision: https://reviews.llvm.org/D24103

llvm-svn: 289510
2016-12-13 01:38:41 +00:00

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; 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: Lcfi0:
; 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: pushq %rax
; CHECK-NEXT: Lcfi
; 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 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. This
; also ends up being a good test of whether we can fold loads from immutable
; stack slots into the statepoint.
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:
; CHECK-LABEL: test4
; CHECK: pushq %rax
; CHECK-NEXT: Lcfi
; 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 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: Ltmp
; 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: Ltmp0-_test1
; CHECK: .byte 1
; CHECK-NEXT: .byte 4
; CHECK-NEXT: .short 5
; CHECK-NEXT: .long 0
; CHECK: Ltmp1-_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: Ltmp2-_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" }
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