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Propagate MIFlags in table gen 

Summary: Add flag propagation to tablegen via OutMIs from originating MI in InstructionSelector::executeMatchTable.

Reviewers: dsanders, volkan

Reviewed By: dsanders

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74988
This commit is contained in:
Michael Berg 2020-05-13 18:19:38 -07:00 committed by mcberg2017
parent fd842d3626
commit a255870f03
2 changed files with 13 additions and 2 deletions
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11
llvm/include/llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h
View File

@ -57,6 +57,7 @@ bool InstructionSelector::executeMatchTable(
uint64_t CurrentIdx = 0;
SmallVector<uint64_t, 4> OnFailResumeAt;
uint16_t Flags = State.MIs[0]->getFlags();
enum RejectAction { RejectAndGiveUp, RejectAndResume };
auto handleReject = [&]() -> RejectAction {
@ -71,6 +72,15 @@ bool InstructionSelector::executeMatchTable(
return RejectAndResume;
};
auto propagateFlags = [&](NewMIVector &OutMIs) {
if (Flags == MachineInstr::MIFlag::NoFlags)
return false;
for (auto MIB : OutMIs)
MIB.setMIFlags(Flags);
return true;
};
while (true) {
assert(CurrentIdx != ~0u && "Invalid MatchTable index");
int64_t MatcherOpcode = MatchTable[CurrentIdx++];
@ -1065,6 +1075,7 @@ bool InstructionSelector::executeMatchTable(
case GIR_Done:
DEBUG_WITH_TYPE(TgtInstructionSelector::getName(),
dbgs() << CurrentIdx << ": GIR_Done\n");
propagateFlags(OutMIs);
return true;
default:

4
llvm/test/CodeGen/AArch64/GlobalISel/select-jump-table-brjt.mir
View File

@ -71,12 +71,12 @@ body: |
; CHECK: BR %18
; CHECK: bb.2.sw.bb:
; CHECK: successors: %bb.4(0x80000000)
; CHECK: [[ADDWri:%[0-9]+]]:gpr32sp = ADDWri [[COPY]], 42, 0
; CHECK: [[ADDWri:%[0-9]+]]:gpr32sp = nsw ADDWri [[COPY]], 42, 0
; CHECK: B %bb.4
; CHECK: bb.3.sw.bb1:
; CHECK: successors: %bb.4(0x80000000)
; CHECK: [[MOVi32imm:%[0-9]+]]:gpr32 = MOVi32imm 3
; CHECK: [[MADDWrrr:%[0-9]+]]:gpr32 = MADDWrrr [[COPY]], [[MOVi32imm]], $wzr
; CHECK: [[MADDWrrr:%[0-9]+]]:gpr32 = nsw MADDWrrr [[COPY]], [[MOVi32imm]], $wzr
; CHECK: bb.4.return:
; CHECK: [[PHI:%[0-9]+]]:gpr32 = PHI [[MADDWrrr]], %bb.3, [[ADDWri]], %bb.2, [[COPY1]], %bb.0, [[COPY2]], %bb.1
; CHECK: $w0 = COPY [[PHI]]