116 lines
3.7 KiB
YAML
116 lines
3.7 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -mtriple aarch64 -run-pass=aarch64-post-select-optimize -verify-machineinstrs %s -o - | FileCheck %s
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--- |
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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@x = external hidden local_unnamed_addr global i32*, align 8
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define void @copy_from_larger_rc_def() { ret void }
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define void @copy_from_larger_rc_def_multi_use() { ret void }
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define void @copy_from_smaller_rc_def() { ret void }
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...
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---
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name: copy_from_larger_rc_def
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alignment: 4
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legalized: true
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regBankSelected: true
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selected: true
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tracksRegLiveness: true
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liveins:
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- { reg: '$x0' }
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- { reg: '$w1' }
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- { reg: '$x2' }
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body: |
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bb.1:
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liveins: $w1, $x0, $x2
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; Show that if we're doing a copy from a large rc to a single user with a smaller rc
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; then we just constrain the def instead.
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; CHECK-LABEL: name: copy_from_larger_rc_def
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; CHECK: liveins: $w1, $x0, $x2
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr64 = COPY $x0
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; CHECK-NEXT: %large_rc_def:gpr64common = UBFMXri [[COPY]], 61, 60
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; CHECK-NEXT: %add:gpr64sp = ADDXri %large_rc_def, 3, 0
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; CHECK-NEXT: $x0 = COPY %add
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; CHECK-NEXT: RET_ReallyLR
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%0:gpr64 = COPY $x0
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%large_rc_def:gpr64 = UBFMXri %0, 61, 60
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%constrain_copy:gpr64common = COPY %large_rc_def
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; Even though ADDXri may not actually need to use gpr64common, just use it as an example.
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%add:gpr64sp = ADDXri %constrain_copy, 3, 0
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$x0 = COPY %add
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RET_ReallyLR
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...
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---
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name: copy_from_larger_rc_def_multi_use
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alignment: 4
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legalized: true
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regBankSelected: true
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selected: true
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tracksRegLiveness: true
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liveins:
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- { reg: '$x0' }
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- { reg: '$w1' }
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- { reg: '$x2' }
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body: |
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bb.1:
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liveins: $w1, $x0, $x2
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; Don't constrain def if the original def has multiple users.
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; CHECK-LABEL: name: copy_from_larger_rc_def_multi_use
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; CHECK: liveins: $w1, $x0, $x2
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr64 = COPY $x0
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; CHECK-NEXT: %large_rc_def:gpr64 = UBFMXri [[COPY]], 61, 60
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; CHECK-NEXT: %constrain_copy:gpr64common = COPY %large_rc_def
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; CHECK-NEXT: %add:gpr64sp = ADDXri %constrain_copy, 3, 0
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; CHECK-NEXT: %add2:gpr64sp = ADDXri %constrain_copy, 3, 0
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; CHECK-NEXT: $x0 = COPY %add
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; CHECK-NEXT: $x1 = COPY %large_rc_def
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; CHECK-NEXT: RET_ReallyLR
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%0:gpr64 = COPY $x0
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%large_rc_def:gpr64 = UBFMXri %0, 61, 60
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%constrain_copy:gpr64common = COPY %large_rc_def
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%add:gpr64sp = ADDXri %constrain_copy, 3, 0
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%add2:gpr64sp = ADDXri %constrain_copy, 3, 0
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$x0 = COPY %add
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$x1 = COPY %large_rc_def
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RET_ReallyLR
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...
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---
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name: copy_from_smaller_rc_def
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alignment: 4
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legalized: true
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regBankSelected: true
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selected: true
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tracksRegLiveness: true
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liveins:
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- { reg: '$x0' }
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- { reg: '$w1' }
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- { reg: '$x2' }
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body: |
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bb.1:
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liveins: $w1, $x0, $x2
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; Show that if we're doing a copy from a small rc to a single user with a larger rc
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; then we just use the smaller def instead of doing a copy.
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; CHECK-LABEL: name: copy_from_smaller_rc_def
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; CHECK: liveins: $w1, $x0, $x2
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr64common = COPY $x0
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; CHECK-NEXT: [[COPY1:%[0-9]+]]:gpr64common = COPY $x1
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; CHECK-NEXT: %add:gpr64common = ADDXri [[COPY1]], 3, 0
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; CHECK-NEXT: STRXui [[COPY1]], %add, target-flags(aarch64-pageoff, aarch64-nc) @x :: (store (p0))
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; CHECK-NEXT: RET_ReallyLR
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%0:gpr64common = COPY $x0
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%1:gpr64common = COPY $x1
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%add:gpr64common = ADDXri %1, 3, 0
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%copy:gpr64sp = COPY %add
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STRXui %1, %copy, target-flags(aarch64-pageoff, aarch64-nc) @x :: (store (p0))
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RET_ReallyLR
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...
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