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Lower statepoints with multi-def targets.

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Statepoint lowering currently expects that the target method of a
statepoint only defines a single value. This precludes using
statepoints with ABIs that return values in multiple registers
(e.g. the SysV AMD64 ABI). This change adds support for lowering
statepoints with mutli-def targets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253339 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pat Gavlin 2015-11-17 16:04:21 +00:00
parent 7673d242f7
commit 4d186a129b
2 changed files with 29 additions and 7 deletions
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16
lib/CodeGen/SelectionDAG/StatepointLowering.cpp
View File

@ -333,13 +333,17 @@ lowerCallFromStatepoint(ImmutableStatepoint ISP, const BasicBlock *EHPadBB,
// ch, glue = callseq_end ch, glue
// get_return_value ch, glue
//
// get_return_value can either be a CopyFromReg to grab the return value from
// %RAX, or it can be a LOAD to load a value returned by reference via a stack
// slot.
// get_return_value can either be a sequence of CopyFromReg instructions
// to grab the return value from the return register(s), or it can be a LOAD
// to load a value returned by reference via a stack slot.
if (HasDef && (CallEnd->getOpcode() == ISD::CopyFromReg ||
CallEnd->getOpcode() == ISD::LOAD))
CallEnd = CallEnd->getOperand(0).getNode();
if (HasDef) {
if (CallEnd->getOpcode() == ISD::LOAD)
CallEnd = CallEnd->getOperand(0).getNode();
else
while (CallEnd->getOpcode() == ISD::CopyFromReg)
CallEnd = CallEnd->getOperand(0).getNode();
}
assert(CallEnd->getOpcode() == ISD::CALLSEQ_END && "expected!");

20
test/CodeGen/X86/statepoint-call-lowering.ll
View File

@ -5,10 +5,13 @@
target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"
%struct = type { i64, i64 }
declare zeroext i1 @return_i1()
declare zeroext i32 @return_i32()
declare i32* @return_i32ptr()
declare float @return_float()
declare %struct @return_struct()
declare void @varargf(i32, ...)
define i1 @test_i1_return() gc "statepoint-example" {
@ -61,12 +64,24 @@ entry:
ret float %call1
}
define %struct @test_struct_return() gc "statepoint-example" {
; CHECK-LABEL: test_struct_return
; CHECK: pushq %rax
; CHECK: callq return_struct
; CHECK: popq %rcx
; CHECK: retq
entry:
%safepoint_token = tail call i32 (i64, i32, %struct ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_structf(i64 0, i32 0, %struct ()* @return_struct, i32 0, i32 0, i32 0, i32 0)
%call1 = call %struct @llvm.experimental.gc.result.struct(i32 %safepoint_token)
ret %struct %call1
}
define i1 @test_relocate(i32 addrspace(1)* %a) gc "statepoint-example" {
; CHECK-LABEL: test_relocate
; Check that an ununsed relocate has no code-generation impact
; CHECK: pushq %rax
; CHECK: callq return_i1
; CHECK-NEXT: .Ltmp9:
; CHECK-NEXT: .Ltmp11:
; CHECK-NEXT: popq %rdx
; CHECK-NEXT: retq
entry:
@ -137,6 +152,9 @@ declare i32* @llvm.experimental.gc.result.p0i32(i32)
declare i32 @llvm.experimental.gc.statepoint.p0f_f32f(i64, i32, float ()*, i32, i32, ...)
declare float @llvm.experimental.gc.result.f32(i32)
declare i32 @llvm.experimental.gc.statepoint.p0f_structf(i64, i32, %struct ()*, i32, i32, ...)
declare %struct @llvm.experimental.gc.result.struct(i32)
declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidi32varargf(i64, i32, void (i32, ...)*, i32, i32, ...)
declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)