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between the two instructions. If there's a pattern like: $xA = ADRP foo @PAGE [some killing use of reg Xb] $Xb = ADDXri $Xa, 0, @PAGEOFF CollectLOH would create an AdrpAdd LOH that resulted in the linker optimizing this sequence into: $xB = ADR foo [some killing use of reg $Xb] ... and therefore clobbers the live $Xb register that was used by the instruction in between. This was discovered by a GlobalISel patch D78465 which broke up global variable accesses into two pseudos, which in some cases could be moved apart. Differential Revision: https://reviews.llvm.org/D80834
57 lines
1.7 KiB
YAML
57 lines
1.7 KiB
YAML
# RUN: llc -o - %s -mtriple=aarch64-apple-ios -run-pass=aarch64-collect-loh -debug-only=aarch64-collect-loh 2>&1 | FileCheck %s
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# REQUIRES: asserts
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--- |
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@rrdpb = local_unnamed_addr global i32 zeroinitializer, align 8
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define internal void @test_use_between() {
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ret void
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}
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define internal void @test_no_use_between() {
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ret void
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}
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...
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# CHECK-LABEL: ********** AArch64 Collect LOH **********
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# CHECK-LABEL: Looking in function test_use_between
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# Check that we don't have an AdrpAdd LOH because there's a use of the ADD defreg
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# in between the two.
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# CHECK-NOT: MCLOH_AdrpAdd
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# CHECK-LABEL: Looking in function test_no_use_between
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# CHECK: MCLOH_AdrpAdd
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---
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name: test_use_between
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alignment: 4
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tracksRegLiveness: true
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liveins:
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- { reg: '$x11', virtual-reg: '' }
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- { reg: '$x12', virtual-reg: '' }
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body: |
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bb.0:
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liveins: $x11, $x12
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renamable $x15 = ADRP target-flags(aarch64-page) @rrdpb
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STRXui renamable $x12, killed renamable $x11, 1 :: (store 8)
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renamable $x11 = ADDXri killed renamable $x15, target-flags(aarch64-pageoff, aarch64-nc) @rrdpb, 0
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STRXui renamable $x11, killed renamable $x11, 0
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RET undef $lr
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...
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---
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name: test_no_use_between
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alignment: 4
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tracksRegLiveness: true
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liveins:
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- { reg: '$x11', virtual-reg: '' }
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- { reg: '$x12', virtual-reg: '' }
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body: |
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bb.0:
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liveins: $x11, $x12
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STRXui renamable $x12, killed renamable $x11, 1 :: (store 8)
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renamable $x15 = ADRP target-flags(aarch64-page) @rrdpb
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renamable $x11 = ADDXri killed renamable $x15, target-flags(aarch64-pageoff, aarch64-nc) @rrdpb, 0
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STRXui renamable $x11, killed renamable $x11, 0
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RET undef $lr
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...
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