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85 lines
2.3 KiB
YAML
85 lines
2.3 KiB
YAML
# RUN: llc -o - -mtriple=thumbv7--windows-gnu -run-pass=greedy -run-pass=virtregrewriter %s | FileCheck %s
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--- |
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target datalayout = "e-m:w-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7--windows-gnu"
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define void @subregLiveThrough() { ret void }
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define void @subregNotLiveThrough() { ret void }
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define void @subregNotLiveThrough2() { ret void }
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...
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---
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# Check that we properly recognize that r1 is live through
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# the first subreg copy.
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# That will materialize as an implicit use of the big register
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# on that copy.
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# PR34107.
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#
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# CHECK-LABEL: name: subregLiveThrough
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name: subregLiveThrough
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gprpair }
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body: |
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bb.0:
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liveins: $r0, $r1
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; That copy is being coalesced so we should use a KILL
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; placeholder. If that's not a kill that means we probably
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; not coalescing %0 and $r0_r1 and thus we are not testing
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; the problematic code anymore.
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;
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; CHECK: $r0 = KILL $r0, implicit killed $r0_r1, implicit-def $r0_r1
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; CHECK-NEXT: $r1 = KILL $r1, implicit killed $r0_r1
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undef %0.gsub_0 = COPY $r0
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%0.gsub_1 = COPY $r1
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tBX_RET 14, $noreg, implicit %0
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...
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---
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# Check that we properly recognize that r1 is *not* live through
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# the first subreg copy.
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# CHECK-LABEL: name: subregNotLiveThrough
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name: subregNotLiveThrough
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gprpair }
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body: |
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bb.0:
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liveins: $r0, $r1
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; r1 is not live through so check we are not implicitly using
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; the big register.
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; CHECK: $r0 = KILL $r0, implicit-def $r0_r1
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; CHECK-NEXT: tBX_RET
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undef %0.gsub_0 = COPY $r0
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tBX_RET 14, $noreg, implicit %0
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...
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---
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# Check that we properly recognize that r1 is *not* live through
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# the first subreg copy. It is defined by this copy, but is not
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# through.
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# CHECK-LABEL: name: subregNotLiveThrough2
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name: subregNotLiveThrough2
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gprpair }
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body: |
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bb.0:
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liveins: $r0, $r1
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; r1 is not live through so check we are not implicitly using
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; the big register.
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; CHECK: $r0 = KILL $r0, implicit-def $r1, implicit-def $r0_r1
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; CHECK-NEXT: tBX_RET
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undef %0.gsub_0 = COPY $r0, implicit-def $r1
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tBX_RET 14, $noreg, implicit %0
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...
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