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# Check that we can remove the redundant save of constant registers such as $zero
# RUN: llc -mtriple=mips64-unknown-freebsd %s -start-before=machine-cp -o - | FileCheck %s --check-prefix ASM
# RUN: llc -mtriple=mips64-unknown-freebsd %s -verify-machineinstrs -run-pass=machine-cp -o - | FileCheck %s
--- |
target triple = "mips64-unknown-freebsd"
define i32 @a() nounwind {
; ASM-LABEL: a:
; ASM: # %bb.0:
; ASM-NEXT: daddiu $sp, $sp, -16
; ASM-NEXT: sd $ra, 8($sp) # 8-byte Folded Spill
; ASM-NEXT: jalr $25
; ASM-NEXT: move $4, $zero
; ASM-NEXT: move $4, $zero
; ASM-NEXT: ld $ra, 8($sp) # 8-byte Folded Reload
; ASM-NEXT: jr $ra
; ASM-NEXT: daddiu $sp, $sp, 16
ret i32 0
}
...
---
name: a
frameInfo:
adjustsStack: true
body: |
bb.0 (%ir-block.0):
liveins: $a0_64, $t9_64, $ra_64, $fp_64, $gp_64
; CHECK-LABEL: name: a
; CHECK: liveins: $a0_64, $t9_64, $ra_64, $fp_64, $gp_64
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
; CHECK-NEXT: $a0_64 = COPY $zero_64
; CHECK-NEXT: JALR64Pseudo $t9_64, csr_n64, implicit-def dead $ra, implicit $a0_64, implicit $gp_64, implicit-def $sp, implicit-def $v0
; CHECK-NEXT: ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
; CHECK-NEXT: $a0_64 = COPY $zero_64
; CHECK-NEXT: PseudoReturn64 undef $ra_64, implicit $v0_64, implicit killed $a0_64
ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
renamable $s0_64 = COPY $zero_64
$a0_64 = COPY renamable $s0_64
JALR64Pseudo $t9_64, csr_n64, implicit-def dead $ra, implicit $a0_64, implicit $gp_64, implicit-def $sp, implicit-def $v0
ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
$a0_64 = COPY killed renamable $s0_64
PseudoReturn64 undef $ra_64, implicit $v0_64, implicit killed $a0_64
...
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