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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -march=amdgcn -verify-machineinstrs -run-pass=simple-register-coalescing -o - %s | FileCheck %s
# Test used to crash with message:
# JoinVals::computeAssignment(unsigned int, (anonymous namespace)::JoinVals &): Assertion `Assignments[ValNo] != -1 && "Bad recursion?"' failed.
# The issue was with processing two operands are parts of the same reg and are
# used in the same instruction (e.g. inline asm): first is "def early-clobber",
# while the other is just "def".
# Register coalescer ran in bad recursion if the early clobbered subreg is
# second in the following sequence of COPYs.
---
name: foo1
tracksRegLiveness: true
body: |
bb.0:
liveins: $vgpr0_vgpr1
; CHECK-LABEL: name: foo1
; CHECK: liveins: $vgpr0_vgpr1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: INLINEASM &"", 0 /* attdialect */, 1835018 /* regdef:SRegOrLds_32 */, def undef %2.sub0, 1835019 /* regdef-ec:SRegOrLds_32 */, def undef early-clobber %2.sub1
; CHECK-NEXT: FLAT_STORE_DWORDX2 $vgpr0_vgpr1, %2, 0, 0, implicit $exec, implicit $flat_scr :: (store (s64))
; CHECK-NEXT: S_ENDPGM 0
INLINEASM &"", 0 /* attdialect */, 1835018 /* regdef:VGPR_32 */, def %0:vgpr_32, 1835019 /* regdef-ec:VGPR_32 */, def early-clobber %1:vgpr_32
undef %2.sub0:vreg_64 = COPY killed %0
%2.sub1:vreg_64 = COPY killed %1
FLAT_STORE_DWORDX2 killed $vgpr0_vgpr1, killed %2, 0, 0, implicit $exec, implicit $flat_scr :: (store (s64))
S_ENDPGM 0
...
---
name: foo2
tracksRegLiveness: true
body: |
bb.0:
liveins: $vgpr0_vgpr1
; CHECK-LABEL: name: foo2
; CHECK: liveins: $vgpr0_vgpr1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: INLINEASM &"", 0 /* attdialect */, 1835019 /* regdef-ec:SRegOrLds_32 */, def undef early-clobber %2.sub1, 1835018 /* regdef:SRegOrLds_32 */, def undef %2.sub0
; CHECK-NEXT: FLAT_STORE_DWORDX2 $vgpr0_vgpr1, %2, 0, 0, implicit $exec, implicit $flat_scr :: (store (s64))
; CHECK-NEXT: S_ENDPGM 0
INLINEASM &"", 0 /* attdialect */, 1835019 /* regdef-ec:VGPR_32 */, def early-clobber %1:vgpr_32, 1835018 /* regdef:VGPR_32 */, def %0:vgpr_32
undef %2.sub0:vreg_64 = COPY killed %0
%2.sub1:vreg_64 = COPY killed %1
FLAT_STORE_DWORDX2 killed $vgpr0_vgpr1, killed %2, 0, 0, implicit $exec, implicit $flat_scr :: (store (s64))
S_ENDPGM 0
...
---
name: foo3
tracksRegLiveness: true
body: |
bb.0:
liveins: $vgpr0_vgpr1
; CHECK-LABEL: name: foo3
; CHECK: liveins: $vgpr0_vgpr1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: INLINEASM &"", 0 /* attdialect */, 1835018 /* regdef:SRegOrLds_32 */, def undef %2.sub0, 1835019 /* regdef-ec:SRegOrLds_32 */, def undef early-clobber %2.sub1
; CHECK-NEXT: FLAT_STORE_DWORDX2 $vgpr0_vgpr1, %2, 0, 0, implicit $exec, implicit $flat_scr :: (store (s64))
; CHECK-NEXT: S_ENDPGM 0
INLINEASM &"", 0 /* attdialect */, 1835018 /* regdef:VGPR_32 */, def %1:vgpr_32, 1835019 /* regdef-ec:VGPR_32 */, def early-clobber %0:vgpr_32
undef %2.sub0:vreg_64 = COPY killed %1
%2.sub1:vreg_64 = COPY killed %0
FLAT_STORE_DWORDX2 killed $vgpr0_vgpr1, killed %2, 0, 0, implicit $exec, implicit $flat_scr :: (store (s64))
S_ENDPGM 0
...
---
name: foo4
tracksRegLiveness: true
body: |
bb.0:
liveins: $vgpr0_vgpr1
; CHECK-LABEL: name: foo4
; CHECK: liveins: $vgpr0_vgpr1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: INLINEASM &"", 0 /* attdialect */, 1835019 /* regdef-ec:SRegOrLds_32 */, def undef early-clobber %2.sub1, 1835018 /* regdef:SRegOrLds_32 */, def undef %2.sub0
; CHECK-NEXT: FLAT_STORE_DWORDX2 $vgpr0_vgpr1, %2, 0, 0, implicit $exec, implicit $flat_scr :: (store (s64))
; CHECK-NEXT: S_ENDPGM 0
INLINEASM &"", 0 /* attdialect */, 1835019 /* regdef-ec:VGPR_32 */, def early-clobber %0:vgpr_32, 1835018 /* regdef:VGPR_32 */, def %1:vgpr_32
undef %2.sub0:vreg_64 = COPY killed %1
%2.sub1:vreg_64 = COPY killed %0
FLAT_STORE_DWORDX2 killed $vgpr0_vgpr1, killed %2, 0, 0, implicit $exec, implicit $flat_scr :: (store (s64))
S_ENDPGM 0
...
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