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[GISel][RegBankSelect] Hide assertion failure from LLT::getScalarSizeInBits [2/14]

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Summary:
It looks like RegBankSelect can try to assign a bank based on a
DBG_VALUE instead of ignoring it. This eventually leads to an assert
in AArch64RegisterBankInfo::getInstrMapping because there is some info
missing from the DBG_VALUE MachineOperand (I see: `Assertion failed:
(RawData != 0 && "Invalid Type"), function getScalarSizeInBits`).

I'm not 100% sure it's safe to insert DBG_VALUE instructions right
before RegBankSelect (that's what -debugify-and-strip-all-safe is
doing). Any advice appreciated.

Depends on D78135.

Reviewers: ab, qcolombet, dsanders, aprantl

Subscribers: kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D78137
This commit is contained in:
Vedant Kumar 2020-04-14 11:35:25 -07:00
parent 327d4464a3
commit 0978def859
2 changed files with 6 additions and 2 deletions
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4
lib/CodeGen/GlobalISel/RegBankSelect.cpp
View File

@ -693,6 +693,10 @@ bool RegBankSelect::runOnMachineFunction(MachineFunction &MF) {
if (isTargetSpecificOpcode(MI.getOpcode()) && !MI.isPreISelOpcode())
continue;
// Ignore debug info.
if (MI.isDebugInstr())
continue;
if (!assignInstr(MI)) {
reportGISelFailure(MF, *TPC, *MORE, "gisel-regbankselect",
"unable to map instruction", MI);

4
test/CodeGen/AArch64/GlobalISel/arm64-regbankselect.mir
View File

@ -1,5 +1,5 @@
# RUN: llc -O0 -run-pass=regbankselect %s -o - -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=FAST
# RUN: llc -O0 -run-pass=regbankselect %s -regbankselect-greedy -o - -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=GREEDY
# RUN: llc -O0 -debugify-and-strip-all-safe -run-pass=regbankselect %s -o - -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=FAST
# RUN: llc -O0 -debugify-and-strip-all-safe -run-pass=regbankselect %s -regbankselect-greedy -o - -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=GREEDY
--- |
; ModuleID = 'generic-virtual-registers-type-error.mir'