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Codegen: [X86] preservere memory refs for folded umul_lohi

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Memory references were not being propagated for this folded load. This
prevented optimizations like LICM from hoisting the load.

Added test to verify that this allows LICM to proceed.

llvm-svn: 273617
This commit is contained in:
Kyle Butt 2016-06-23 21:40:35 +00:00
parent b89a2c2028
commit 19b31c24cb
2 changed files with 42 additions and 3 deletions
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12
lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -2223,24 +2223,32 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
if (foldedLoad) {
SDValue Chain;
MachineSDNode *CNode = nullptr;
SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, N1.getOperand(0),
InFlag };
if (MOpc == X86::MULX32rm || MOpc == X86::MULX64rm) {
SDVTList VTs = CurDAG->getVTList(NVT, NVT, MVT::Other, MVT::Glue);
SDNode *CNode = CurDAG->getMachineNode(MOpc, dl, VTs, Ops);
CNode = CurDAG->getMachineNode(MOpc, dl, VTs, Ops);
ResHi = SDValue(CNode, 0);
ResLo = SDValue(CNode, 1);
Chain = SDValue(CNode, 2);
InFlag = SDValue(CNode, 3);
} else {
SDVTList VTs = CurDAG->getVTList(MVT::Other, MVT::Glue);
SDNode *CNode = CurDAG->getMachineNode(MOpc, dl, VTs, Ops);
CNode = CurDAG->getMachineNode(MOpc, dl, VTs, Ops);
Chain = SDValue(CNode, 0);
InFlag = SDValue(CNode, 1);
}
// Update the chain.
ReplaceUses(N1.getValue(1), Chain);
// Record the mem-refs
LoadSDNode *LoadNode = cast<LoadSDNode>(N1);
if (LoadNode) {
MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1);
MemOp[0] = LoadNode->getMemOperand();
CNode->setMemRefs(MemOp, MemOp + 1);
}
} else {
SDValue Ops[] = { N1, InFlag };
if (Opc == X86::MULX32rr || Opc == X86::MULX64rr) {

33
test/CodeGen/X86/hoist-invariant-load.ll
View File

@ -1,7 +1,10 @@
; REQUIRES: asserts
; RUN: llc < %s -stats -O2 2>&1 | grep "2 machine-licm"
; RUN: llc -mcpu=haswell < %s -stats -O2 2>&1 | grep "4 machine-licm.*hoisted"
; For test:
; 2 invariant loads, 1 for OBJC_SELECTOR_REFERENCES_
; and 1 for objc_msgSend from the GOT
; For test_multi_def:
; 2 invariant load (full multiply, both loads should be hoisted.)
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.7.2"
@ -29,4 +32,32 @@ for.end: ; preds = %for.body
declare i8* @objc_msgSend(i8*, i8*, ...) nonlazybind
define void @test_multi_def(i64* dereferenceable(8) %x1,
i64* dereferenceable(8) %x2,
i128* %y, i64 %count) nounwind {
entry:
br label %for.body
for.check:
%inc = add nsw i64 %i, 1
%done = icmp sge i64 %inc, %count
br i1 %done, label %exit, label %for.body
for.body:
%i = phi i64 [ 0, %entry ], [ %inc, %for.check ]
%x1_load = load i64, i64* %x1, align 8, !invariant.load !0
%x1_zext = zext i64 %x1_load to i128
%x2_load = load i64, i64* %x2, align 8, !invariant.load !0
%x2_zext = zext i64 %x2_load to i128
%x_prod = mul i128 %x1_zext, %x2_zext
%y_elem = getelementptr inbounds i128, i128* %y, i64 %i
%y_load = load i128, i128* %y_elem, align 8
%y_plus = add i128 %x_prod, %y_load
store i128 %y_plus, i128* %y_elem, align 8
br label %for.check
exit:
ret void
}
!0 = !{}