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