1 # RUN: llc -march=x86-64 %s -o - -run-pass=processimpdefs -run-pass=unreachable-mbb-elimination | FileCheck %s 2 --- 3 name: f 4 tracksRegLiveness: true 5 registers: 6 - { id: 0, class: gr32, preferred-register: '' } 7 - { id: 1, class: gr32, preferred-register: '' } 8 - { id: 2, class: gr32, preferred-register: '' } 9 body: | 10 bb.0: 11 %0 = IMPLICIT_DEF 12 JMP_1 %bb.1 13 14 bb.1: 15 %1 = PHI %0, %bb.0, %2, %bb.2 16 %2 = ADD32ri8 killed %1, 1, implicit-def $eflags 17 JMP_1 %bb.3 18 19 bb.2: 20 JMP_1 %bb.1 21 22 bb.3: 23 ... 24 25 # bb2 above is dead and should be removed and the PHI should be replaced with a 26 # COPY from an undef value since the bb0 value in the PHI is undef. 27 28 # CHECK: bb.0: 29 # CHECK: successors: %bb.1 30 # CHECK: JMP_1 %bb.1 31 32 # CHECK: bb.1: 33 # CHECK: successors: %bb.2 34 # CHECK: [[TMP1:%[0-9]+]]:gr32 = COPY undef %{{[0-9]+}} 35 # CHECK: %{{[0-9]+}}:gr32 = ADD32ri8 killed [[TMP1]], 1 36 # CHECK: JMP_1 %bb.2 37 38 # CHECK: bb.2: 39
