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Differential D131958 Diff 452969 llvm/test/CodeGen/AArch64/avoid-zero-copy.mir

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llvm/test/CodeGen/AArch64/avoid-zero-copy.mir

# Check that we can remove the redundant save of constant registers such as $wzr # Check that we can remove the redundant save of constant registers such as $wzr
# RUN: llc -mtriple=aarch64-unknown-linux %s -start-before=machine-cp -o - | FileCheck %s --check-prefix ASM # RUN: llc -mtriple=aarch64-unknown-linux %s -start-before=machine-cp -o - | FileCheck %s --check-prefix ASM
# RUN: llc -mtriple=aarch64-unknown-linux %s -run-pass=machine-cp -o - | FileCheck %s # RUN: llc -mtriple=aarch64-unknown-linux %s -run-pass=machine-cp -o - | FileCheck %s
--- | --- |
target triple = "aarch64-unknown-linux" target triple = "aarch64-unknown-linux"
declare i32 @bar(i32) nounwind declare i32 @bar(i32) nounwind
define i32 @foo() nounwind { define i32 @foo() nounwind {
; ASM-LABEL: foo: ; ASM-LABEL: foo:
; ASM: // %bb.0: ; ASM: // %bb.0:
; ASM-NEXT: stp x30, x19, [sp, #-16]! // 16-byte Folded Spill ; ASM-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
; ASM-NEXT: mov w0, wzr ; ASM-NEXT: mov w0, wzr
; ASM-NEXT: mov w19, wzr
; ASM-NEXT: bl bar ; ASM-NEXT: bl bar
; ASM-NEXT: mov w0, w19 ; ASM-NEXT: mov w0, wzr
; ASM-NEXT: ldp x30, x19, [sp], #16 // 16-byte Folded Reload ; ASM-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload
; ASM-NEXT: ret ; ASM-NEXT: ret
call i32 @bar(i32 0) call i32 @bar(i32 0)
ret i32 0 ret i32 0
} }
... ...
--- ---
name: foo name: foo
body: | body: |
bb.0 (%ir-block.0): bb.0 (%ir-block.0):
; CHECK-LABEL: name: foo ; CHECK-LABEL: name: foo
; CHECK: ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp ; CHECK: ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
; CHECK-NEXT: renamable $w19 = COPY $wzr
; CHECK-NEXT: $w0 = COPY $wzr ; CHECK-NEXT: $w0 = COPY $wzr
; CHECK-NEXT: BL @bar, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $w0, implicit-def $sp, implicit-def $w0 ; CHECK-NEXT: BL @bar, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $w0, implicit-def $sp, implicit-def $w0
; CHECK-NEXT: ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp ; CHECK-NEXT: ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
; CHECK-NEXT: $w0 = COPY killed renamable $w19 ; CHECK-NEXT: $w0 = COPY $wzr
; CHECK-NEXT: RET_ReallyLR implicit $w0 ; CHECK-NEXT: RET_ReallyLR implicit $w0
ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
renamable $w19 = COPY $wzr renamable $w19 = COPY $wzr
$w0 = COPY renamable $w19 $w0 = COPY renamable $w19
BL @bar, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $w0, implicit-def $sp, implicit-def $w0 BL @bar, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $w0, implicit-def $sp, implicit-def $w0
ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
$w0 = COPY killed renamable $w19 $w0 = COPY killed renamable $w19
RET_ReallyLR implicit $w0 RET_ReallyLR implicit $w0
... ...