From c515dddbb1cfbccf82388b5cee713f364ca590af Mon Sep 17 00:00:00 2001
From: Azharuddin Mohammed <azharudd@codeaurora.org>
Date: Sun, 12 Mar 2017 14:02:32 +0000
Subject: [PATCH] Remove CRC32 instructions from
 AArch64InstrInfo::hasShiftedReg

Summary:
A53 scheduler causes an assertion failure on all CRC instructions:
include/llvm/CodeGen/MachineInstr.h:280: const llvm::MachineOperand
&llvm::MachineInstr::getOperand(unsigned int) const: Assertion `i <
getNumOperands() && "getOperand() out of range!"' failed.

The case statements corresponding to CRC instructions are incorrect and should
be removed.

Also adding a testcase while on this.

Reviewers: t.p.northover, javed.absar, apazos, rengolin

Reviewed By: rengolin

Subscribers: evandro, aemerson, llvm-commits, rengolin

Differential Revision: https://reviews.llvm.org/D30274

llvm-svn: 297582
---
 lib/Target/AArch64/AArch64InstrInfo.cpp | 8 --------
 test/CodeGen/AArch64/arm64-crc32.ll     | 1 +
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/lib/Target/AArch64/AArch64InstrInfo.cpp b/lib/Target/AArch64/AArch64InstrInfo.cpp
index d1885095238..6adf9f28b83 100644
--- a/lib/Target/AArch64/AArch64InstrInfo.cpp
+++ b/lib/Target/AArch64/AArch64InstrInfo.cpp
@@ -1345,14 +1345,6 @@ bool AArch64InstrInfo::hasShiftedReg(const MachineInstr &MI) const {
   case AArch64::BICSXrs:
   case AArch64::BICWrs:
   case AArch64::BICXrs:
-  case AArch64::CRC32Brr:
-  case AArch64::CRC32CBrr:
-  case AArch64::CRC32CHrr:
-  case AArch64::CRC32CWrr:
-  case AArch64::CRC32CXrr:
-  case AArch64::CRC32Hrr:
-  case AArch64::CRC32Wrr:
-  case AArch64::CRC32Xrr:
   case AArch64::EONWrs:
   case AArch64::EONXrs:
   case AArch64::EORWrs:
diff --git a/test/CodeGen/AArch64/arm64-crc32.ll b/test/CodeGen/AArch64/arm64-crc32.ll
index 22111de5a3a..df9465a6bda 100644
--- a/test/CodeGen/AArch64/arm64-crc32.ll
+++ b/test/CodeGen/AArch64/arm64-crc32.ll
@@ -1,4 +1,5 @@
 ; RUN: llc -mtriple=arm64-eabi -mattr=+crc -o - %s | FileCheck %s
+; RUN: llc -mtriple=arm64-eabi -mcpu=cortex-a53 -mattr=+crc -o - %s | FileCheck %s
 
 define i32 @test_crc32b(i32 %cur, i8 %next) {
 ; CHECK-LABEL: test_crc32b: