select-jump-table-brjt-constrain.mir
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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=aarch64-unknown-unknown -o - -verify-machineinstrs -run-pass=instruction-select %s | FileCheck %s
# When we select the G_ZEXTLOAD, the SUBREG_TO_REG will initially land on a
# gpr64sp register.
#
# This caused a test failure when selecting the G_BRJT, because it was not being
# constrained. This test checks that the G_BRJT is actually being constrained.
# As a result, the SUBREG_TO_REG should end up on a gpr64common.
...
---
name: check_constrain
legalized: true
regBankSelected: true
tracksRegLiveness: true
jumpTable:
kind: block-address
entries:
- id: 0
blocks: [ '%bb.4' ]
body: |
; CHECK-LABEL: name: check_constrain
; CHECK: bb.0:
; CHECK: successors: %bb.3(0x40000000), %bb.1(0x40000000)
; CHECK: [[DEF:%[0-9]+]]:gpr64common = IMPLICIT_DEF
; CHECK: [[LDRBBui:%[0-9]+]]:gpr32 = LDRBBui [[DEF]], 0 :: (load 1)
; CHECK: [[SUBREG_TO_REG:%[0-9]+]]:gpr64common = SUBREG_TO_REG 0, [[LDRBBui]], %subreg.sub_32
; CHECK: $xzr = SUBSXri [[SUBREG_TO_REG]], 8, 0, implicit-def $nzcv
; CHECK: Bcc 8, %bb.3, implicit $nzcv
; CHECK: bb.1:
; CHECK: successors: %bb.2(0x40000000), %bb.3(0x40000000)
; CHECK: [[MOVaddrJT:%[0-9]+]]:gpr64 = MOVaddrJT target-flags(aarch64-page) %jump-table.0, target-flags(aarch64-pageoff, aarch64-nc) %jump-table.0
; CHECK: early-clobber %6:gpr64, early-clobber %7:gpr64sp = JumpTableDest32 [[MOVaddrJT]], [[SUBREG_TO_REG]], %jump-table.0
; CHECK: BR %6
; CHECK: bb.2:
; CHECK: successors: %bb.3(0x80000000)
; CHECK: bb.3:
; CHECK: RET_ReallyLR
bb.1:
%1:gpr(p0) = G_IMPLICIT_DEF
%5:gpr(s64) = G_ZEXTLOAD %1(p0) :: (load 1)
%7:gpr(s64) = G_CONSTANT i64 8
%16:gpr(s32) = G_ICMP intpred(ugt), %5(s64), %7
%8:gpr(s1) = G_TRUNC %16(s32)
G_BRCOND %8(s1), %bb.4
bb.2:
successors: %bb.3, %bb.4
%9:gpr(p0) = G_JUMP_TABLE %jump-table.0
G_BRJT %9(p0), %jump-table.0, %5(s64)
bb.3:
G_BR %bb.4
bb.4:
RET_ReallyLR
...