1 2 # RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass machine-cp -verify-machineinstrs -o - %s | FileCheck %s 3 4 --- | 5 define i32 @copyprop1(i32 %a, i32 %b) { ret i32 %a } 6 define i32 @copyprop2(i32 %a, i32 %b) { ret i32 %a } 7 define i32 @copyprop3(i32 %a, i32 %b) { ret i32 %a } 8 define i32 @copyprop4(i32 %a, i32 %b) { ret i32 %a } 9 declare i32 @foo(i32) 10 ... 11 --- 12 # The first copy is dead copy which is not used. 13 # CHECK-LABEL: name: copyprop1 14 # CHECK: bb.0: 15 # CHECK-NOT: %w20 = COPY 16 name: copyprop1 17 allVRegsAllocated: true 18 body: | 19 bb.0: 20 liveins: %w0, %w1 21 %w20 = COPY %w1 22 BL @foo, csr_aarch64_aapcs, implicit %w0, implicit-def %w0 23 RET_ReallyLR implicit %w0 24 ... 25 --- 26 # The first copy is not a dead copy which is used in the second copy after the 27 # call. 28 # CHECK-LABEL: name: copyprop2 29 # CHECK: bb.0: 30 # CHECK: %w20 = COPY 31 name: copyprop2 32 allVRegsAllocated: true 33 body: | 34 bb.0: 35 liveins: %w0, %w1 36 %w20 = COPY %w1 37 BL @foo, csr_aarch64_aapcs, implicit %w0, implicit-def %w0 38 %w0 = COPY %w20 39 RET_ReallyLR implicit %w0 40 ... 41 --- 42 # Both the first and second copy are dead copies which are not used. 43 # CHECK-LABEL: name: copyprop3 44 # CHECK: bb.0: 45 # CHECK-NOT: COPY 46 name: copyprop3 47 allVRegsAllocated: true 48 body: | 49 bb.0: 50 liveins: %w0, %w1 51 %w20 = COPY %w1 52 BL @foo, csr_aarch64_aapcs, implicit %w0, implicit-def %w0 53 %w20 = COPY %w0 54 RET_ReallyLR implicit %w0 55 ... 56 # The second copy is removed as a NOP copy, after then the first copy become 57 # dead which should be removed as well. 58 # CHECK-LABEL: name: copyprop4 59 # CHECK: bb.0: 60 # CHECK-NOT: COPY 61 name: copyprop4 62 allVRegsAllocated: true 63 body: | 64 bb.0: 65 liveins: %w0, %w1 66 %w20 = COPY %w0 67 %w0 = COPY %w20 68 BL @foo, csr_aarch64_aapcs, implicit %w0, implicit-def %w0 69 RET_ReallyLR implicit %w0 70 ... 71 72
