44 lines · plain
1# Check that we can remove the redundant save of constant registers such as $zero2# RUN: llc -mtriple=mips64-unknown-freebsd %s -start-before=machine-cp -o - | FileCheck %s --check-prefix ASM3# RUN: llc -mtriple=mips64-unknown-freebsd %s -verify-machineinstrs -run-pass=machine-cp -o - | FileCheck %s4--- |5 target triple = "mips64-unknown-freebsd"6 define i32 @a() nounwind {7 ; ASM-LABEL: a:8 ; ASM: # %bb.0:9 ; ASM-NEXT: daddiu $sp, $sp, -1610 ; ASM-NEXT: sd $ra, 8($sp) # 8-byte Folded Spill11 ; ASM-NEXT: jalr $2512 ; ASM-NEXT: move $4, $zero13 ; ASM-NEXT: move $4, $zero14 ; ASM-NEXT: ld $ra, 8($sp) # 8-byte Folded Reload15 ; ASM-NEXT: jr $ra16 ; ASM-NEXT: daddiu $sp, $sp, 1617 ret i32 018 }19...20---21name: a22frameInfo:23 adjustsStack: true24body: |25 bb.0 (%ir-block.0):26 liveins: $a0_64, $t9_64, $ra_64, $fp_64, $gp_6427 ; CHECK-LABEL: name: a28 ; CHECK: liveins: $a0_64, $t9_64, $ra_64, $fp_64, $gp_6429 ; CHECK-NEXT: {{ $}}30 ; CHECK-NEXT: ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp31 ; CHECK-NEXT: $a0_64 = COPY $zero_6432 ; CHECK-NEXT: JALR64Pseudo $t9_64, csr_n64, implicit-def dead $ra, implicit $a0_64, implicit $gp_64, implicit-def $sp, implicit-def $v033 ; CHECK-NEXT: ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp34 ; CHECK-NEXT: $a0_64 = COPY $zero_6435 ; CHECK-NEXT: PseudoReturn64 undef $ra_64, implicit $v0_64, implicit killed $a0_6436 ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp37 renamable $s0_64 = COPY $zero_6438 $a0_64 = COPY renamable $s0_6439 JALR64Pseudo $t9_64, csr_n64, implicit-def dead $ra, implicit $a0_64, implicit $gp_64, implicit-def $sp, implicit-def $v040 ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp41 $a0_64 = COPY killed renamable $s0_6442 PseudoReturn64 undef $ra_64, implicit $v0_64, implicit killed $a0_6443...44