1# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4 2# RUN: llc -mtriple=x86_64-pc-linux-gnu -run-pass=register-coalescer -verify-coalescing -o - %s | FileCheck %s 3 4# Check for "Live range continues after dead def flag". 5 6# There are 2 copies of undef, but the registers also appear to be 7# live due to block live outs, and thus were not deleted as 8# eliminateUndefCopy only considered the live range, and not the undef 9# flag. 10# 11# removePartialRedundancy would move the COPY undef %0 in bb.1 to 12# bb.0. The live range of %1 would then be extended to be live out of 13# %bb.1 for the backedge phi. This would then fail the verifier, since 14# the dead flag was no longer valid. This was fixed by directly 15# considering the undef flag to avoid considering this special case. 16 17--- 18name: partial_redundancy_coalesce_undef_copy_live_out 19tracksRegLiveness: true 20body: | 21 ; CHECK-LABEL: name: partial_redundancy_coalesce_undef_copy_live_out 22 ; CHECK: bb.0: 23 ; CHECK-NEXT: successors: %bb.1(0x80000000) 24 ; CHECK-NEXT: liveins: $rdi 25 ; CHECK-NEXT: {{ $}} 26 ; CHECK-NEXT: [[COPY:%[0-9]+]]:gr32 = COPY $rdi 27 ; CHECK-NEXT: {{ $}} 28 ; CHECK-NEXT: bb.1: 29 ; CHECK-NEXT: successors: %bb.1(0x80000000) 30 ; CHECK-NEXT: {{ $}} 31 ; CHECK-NEXT: dead [[XOR32ri:%[0-9]+]]:gr32 = XOR32ri undef [[XOR32ri]], 1, implicit-def dead $eflags 32 ; CHECK-NEXT: dead [[MOV32rr:%[0-9]+]]:gr32 = MOV32rr [[COPY]] 33 ; CHECK-NEXT: [[COPY:%[0-9]+]]:gr32 = IMPLICIT_DEF 34 ; CHECK-NEXT: JMP_1 %bb.1 35 bb.0: 36 liveins: $rdi 37 38 %0:gr32 = COPY $rdi 39 40 bb.1: 41 %1:gr32 = COPY undef %0 42 dead %1:gr32 = XOR32ri %1, 1, implicit-def dead $eflags 43 dead %2:gr32 = MOV32rr killed %0 44 %0:gr32 = COPY killed undef %1 45 JMP_1 %bb.1 46 47... 48