8c0483bba2
Do not try to rematerialize a super-register def used by a subregister extract copy into a copy to a physical register if the other pieces of the full physreg are live at the rematerialization point. It would insert the super-register def at the rematerialization point, and assert since the other half of the register was already live. This is analagous to the undef subregister def handling above, which handled the virtual register case. Fixes #120970
86 lines
2.9 KiB
YAML
86 lines
2.9 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
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# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=register-coalescer -o - %s | FileCheck %s
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# This used to assert due to trying to rematerialize V_MOV_B64_PSEUDO
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# at copy to $vgpr1. This would assert since this would clobber the
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# live value in $vgpr0.
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---
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name: rematerialize_physreg_sub_def_already_live_at_def_assert
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $vgpr0
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; CHECK-LABEL: name: rematerialize_physreg_sub_def_already_live_at_def_assert
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; CHECK: liveins: $vgpr0
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[V_MOV_B:%[0-9]+]]:vreg_64 = V_MOV_B64_PSEUDO 1, implicit $exec
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; CHECK-NEXT: $vgpr0 = V_MOV_B32_e32 0, implicit $exec
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; CHECK-NEXT: $vgpr1 = COPY [[V_MOV_B]].sub1
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; CHECK-NEXT: SI_RETURN implicit $vgpr0, implicit killed $vgpr1
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%0:vreg_64 = V_MOV_B64_PSEUDO 1, implicit $exec
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%1:vgpr_32 = COPY %0.sub1
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$vgpr0 = V_MOV_B32_e32 0, implicit $exec
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$vgpr1 = COPY %1
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SI_RETURN implicit $vgpr0, implicit killed $vgpr1
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...
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# Same as previous, except with an IMPLICIT_DEF
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---
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name: rematerialize_physreg_sub_def_already_live_at_def_assert_implicit_def
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $vgpr0
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; CHECK-LABEL: name: rematerialize_physreg_sub_def_already_live_at_def_assert_implicit_def
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; CHECK: liveins: $vgpr0
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[DEF:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
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; CHECK-NEXT: $vgpr0 = V_MOV_B32_e32 0, implicit $exec
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; CHECK-NEXT: $vgpr1 = COPY [[DEF]].sub1
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; CHECK-NEXT: SI_RETURN implicit $vgpr0, implicit killed $vgpr1
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%0:vreg_64 = IMPLICIT_DEF
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%1:vgpr_32 = COPY %0.sub1
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$vgpr0 = V_MOV_B32_e32 0, implicit $exec
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$vgpr1 = COPY %1
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SI_RETURN implicit $vgpr0, implicit killed $vgpr1
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...
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---
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name: rematerialize_physreg_sub_def_no_live_sub_def_0
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $vgpr0
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; CHECK-LABEL: name: rematerialize_physreg_sub_def_no_live_sub_def_0
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; CHECK: liveins: $vgpr0
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: dead $vgpr0_vgpr1 = V_MOV_B64_PSEUDO 1, implicit $exec, implicit-def $vgpr1
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; CHECK-NEXT: SI_RETURN implicit killed $vgpr1
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%0:vreg_64 = V_MOV_B64_PSEUDO 1, implicit $exec
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%1:vgpr_32 = COPY %0.sub1
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$vgpr1 = COPY %1
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SI_RETURN implicit killed $vgpr1
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...
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---
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name: rematerialize_physreg_sub_def_no_live_sub_def_1
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $vgpr0
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; CHECK-LABEL: name: rematerialize_physreg_sub_def_no_live_sub_def_1
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; CHECK: liveins: $vgpr0
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: dead $vgpr1_vgpr2 = V_MOV_B64_PSEUDO 1, implicit $exec, implicit-def $vgpr1
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; CHECK-NEXT: SI_RETURN implicit killed $vgpr1
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%0:vreg_64 = V_MOV_B64_PSEUDO 1, implicit $exec
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%1:vgpr_32 = COPY %0.sub0
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$vgpr1 = COPY %1
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SI_RETURN implicit killed $vgpr1
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...
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