derek.holloway
7502bf64a4
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44 lines
1.9 KiB
YAML
44 lines
1.9 KiB
YAML
# Check that we can remove the redundant save of constant registers such as $zero
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# RUN: llc -mtriple=mips64-unknown-freebsd %s -start-before=machine-cp -o - | FileCheck %s --check-prefix ASM
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# RUN: llc -mtriple=mips64-unknown-freebsd %s -verify-machineinstrs -run-pass=machine-cp -o - | FileCheck %s
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--- |
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target triple = "mips64-unknown-freebsd"
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define i32 @a() nounwind {
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; ASM-LABEL: a:
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; ASM: # %bb.0:
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; ASM-NEXT: daddiu $sp, $sp, -16
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; ASM-NEXT: sd $ra, 8($sp) # 8-byte Folded Spill
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; ASM-NEXT: jalr $25
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; ASM-NEXT: move $4, $zero
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; ASM-NEXT: move $4, $zero
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; ASM-NEXT: ld $ra, 8($sp) # 8-byte Folded Reload
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; ASM-NEXT: jr $ra
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; ASM-NEXT: daddiu $sp, $sp, 16
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ret i32 0
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}
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...
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---
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name: a
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frameInfo:
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adjustsStack: true
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body: |
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bb.0 (%ir-block.0):
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liveins: $a0_64, $t9_64, $ra_64, $fp_64, $gp_64
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; CHECK-LABEL: name: a
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; CHECK: liveins: $a0_64, $t9_64, $ra_64, $fp_64, $gp_64
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
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; CHECK-NEXT: $a0_64 = COPY $zero_64
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; CHECK-NEXT: JALR64Pseudo $t9_64, csr_n64, implicit-def dead $ra, implicit $a0_64, implicit $gp_64, implicit-def $sp, implicit-def $v0
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; CHECK-NEXT: ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
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; CHECK-NEXT: $a0_64 = COPY $zero_64
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; CHECK-NEXT: PseudoReturn64 undef $ra_64, implicit $v0_64, implicit killed $a0_64
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ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
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renamable $s0_64 = COPY $zero_64
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$a0_64 = COPY renamable $s0_64
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JALR64Pseudo $t9_64, csr_n64, implicit-def dead $ra, implicit $a0_64, implicit $gp_64, implicit-def $sp, implicit-def $v0
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ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
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$a0_64 = COPY killed renamable $s0_64
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PseudoReturn64 undef $ra_64, implicit $v0_64, implicit killed $a0_64
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...
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