1 # RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass machine-sink -o - %s | FileCheck %s 2 --- | 3 define void @sinkwzr() { ret void } 4 ... 5 --- 6 name: sinkwzr 7 tracksRegLiveness: true 8 registers: 9 - { id: 0, class: gpr32 } 10 - { id: 1, class: gpr32 } 11 - { id: 2, class: gpr32sp } 12 - { id: 3, class: gpr32 } 13 - { id: 4, class: gpr32 } 14 body: | 15 ; Check that WZR copy is sunk into the loop preheader. 16 ; CHECK-LABEL: name: sinkwzr 17 ; CHECK-LABEL: bb.0: 18 ; CHECK-NOT: COPY $wzr 19 bb.0: 20 liveins: $w0 21 22 %0 = COPY $w0 23 %1 = COPY $wzr 24 CBZW %0, %bb.3 25 26 ; CHECK-LABEL: bb.1: 27 ; CHECK: COPY $wzr 28 29 bb.1: 30 B %bb.2 31 32 bb.2: 33 %2 = PHI %0, %bb.1, %4, %bb.2 34 $w0 = COPY %1 35 %3 = SUBSWri %2, 1, 0, implicit-def dead $nzcv 36 %4 = COPY %3 37 CBZW %3, %bb.3 38 B %bb.2 39 40 bb.3: 41 RET_ReallyLR 42 43 ... 44
