derek.holloway
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55 lines
2.5 KiB
YAML
55 lines
2.5 KiB
YAML
# RUN: llc -run-pass=aarch64-ldst-opt -mtriple=aarch64 -verify-machineinstrs -o - %s | FileCheck %s
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# This test checks that aarch64 load store optimizer is not throwing an
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# assertion:
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# "Rename register used between paired instruction, trashing the content".
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#
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# The assertion was previously triggered because q0 is picked as renamable
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# register, which overlap with renamable undef d0 used by ZIP2 instruction.
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# However, the content of an undef register is not used in meaningful way,
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# aarch64 load store optimizer should not throw an assertion if a renamable
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# register picked overlap with a renamable undef register.
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# This test also checks that pairwise store STP is generated.
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# CHECK-LABEL: test
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# CHECK: bb.0:
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# CHECK-NEXT: liveins: $x0, $x17, $x18
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# CHECK: renamable $q13_q14_q15 = LD3Threev16b undef renamable $x17 :: (load (s384) from `ptr undef`, align 64)
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# CHECK-NEXT: renamable $q23_q24_q25 = LD3Threev16b undef renamable $x18 :: (load (s384) from `ptr undef`, align 64)
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# CHECK-NEXT: $q0 = EXTv16i8 renamable $q23, renamable $q23, 8
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# CHECK-NEXT: renamable $q20 = EXTv16i8 renamable $q14, renamable $q14, 8
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# CHECK-NEXT: STRQui killed renamable $q20, $sp, 4 :: (store (s128))
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# CHECK-NEXT: renamable $d6 = ZIP2v8i8 renamable $d23, undef renamable $d0
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# CHECK-NEXT: STRDui killed renamable $d6, $sp, 11 :: (store (s64))
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# CHECK-NEXT: renamable $q6 = EXTv16i8 renamable $q13, renamable $q13, 8
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# CHECK-NEXT: STPQi killed renamable $q6, killed $q0, $sp, 6 :: (store (s128))
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# CHECK-NEXT: RET undef $lr
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---
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name: test
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alignment: 4
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tracksRegLiveness: true
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liveins:
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- { reg: '$x0', virtual-reg: '' }
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frameInfo:
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maxAlignment: 16
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maxCallFrameSize: 0
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fixedStack: []
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machineFunctionInfo: {}
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body: |
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bb.0:
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liveins: $x0, $x17, $x18
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renamable $q13_q14_q15 = LD3Threev16b undef renamable $x17 :: (load (s384) from `ptr undef`, align 64)
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renamable $q23_q24_q25 = LD3Threev16b undef renamable $x18 :: (load (s384) from `ptr undef`, align 64)
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renamable $q20 = EXTv16i8 renamable $q23, renamable $q23, 8
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STRQui killed renamable $q20, $sp, 7 :: (store (s128))
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renamable $q20 = EXTv16i8 renamable $q14, renamable $q14, 8
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STRQui killed renamable $q20, $sp, 4 :: (store (s128))
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renamable $d6 = ZIP2v8i8 renamable $d23, undef renamable $d0
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STRDui killed renamable $d6, $sp, 11 :: (store (s64))
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renamable $q6 = EXTv16i8 renamable $q13, renamable $q13, 8
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STRQui killed renamable $q6, $sp, 6 :: (store (s128))
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RET undef $lr
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...
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