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91 lines
3.4 KiB
YAML
91 lines
3.4 KiB
YAML
# RUN: llc -mtriple=amdgcn -mcpu=gfx90a -verify-machineinstrs -run-pass=si-fix-sgpr-copies -o - %s | FileCheck %s
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# Regression for the gfx90a waterfall lane reader: when an inreg call
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# argument's source virtual register lives in an AV_* class (which
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# allows AGPR), emitLoadScalarOpsFromVGPRLoop must legalize the
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# ScalarOp into a class compatible with V_READFIRSTLANE_B32 by
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# inserting a COPY to the common subclass (e.g. VGPR_32). Without the
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# COPY, the loop emits `V_READFIRSTLANE_B32 %vreg:av_32`, and
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# `-verify-machineinstrs` fails with:
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# *** Bad machine code: Illegal virtual register for instruction ***
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# Expected a VGPR_32 register, but got a AV_32 register
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# AV_32 ScalarOp: a COPY to VGPR_32 must be inserted in the loop header
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# before V_READFIRSTLANE_B32 reads the lane, so the readfirstlane
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# source is a pure VGPR class.
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---
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name: waterfall_si_call_inreg_av32
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tracksRegLiveness: true
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frameInfo:
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adjustsStack: true
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hasCalls: true
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machineFunctionInfo:
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scratchRSrcReg: '$sgpr0_sgpr1_sgpr2_sgpr3'
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stackPtrOffsetReg: '$sgpr32'
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occupancy: 8
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body: |
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; CHECK-LABEL: name: waterfall_si_call_inreg_av32
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; CHECK: bb.0:
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; CHECK: [[SRC:%[0-9]+]]:av_32 = COPY $vgpr0
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; CHECK: [[DEST:%[0-9]+]]:sreg_64_xexec = COPY $sgpr4_sgpr5
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; CHECK: bb.1:
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; CHECK: [[VCOPY:%[0-9]+]]:vgpr_32 = COPY [[SRC]]
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; CHECK: [[LANE:%[0-9]+]]:sreg_32_xm0 = V_READFIRSTLANE_B32 [[VCOPY]], implicit $exec
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; CHECK: {{.*}}:sreg_64_xexec = V_CMP_EQ_U32_e64 [[LANE]], [[VCOPY]], implicit $exec
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; CHECK: {{.*}}:sreg_64_xexec = S_AND_SAVEEXEC_B64
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; CHECK: bb.2:
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; CHECK: ADJCALLSTACKUP
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; CHECK: $sgpr16 = COPY [[LANE]]
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; CHECK: SI_CALL_ISEL [[DEST]], 0, csr_amdgpu_gfx90ainsts, implicit killed $sgpr16
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; CHECK: ADJCALLSTACKDOWN
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; CHECK: SI_WATERFALL_LOOP %bb.1
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bb.0:
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liveins: $vgpr0, $sgpr4_sgpr5
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%0:av_32 = COPY $vgpr0
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%1:sreg_64_xexec = COPY $sgpr4_sgpr5
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ADJCALLSTACKUP 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
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$sgpr16 = COPY %0
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SI_CALL_ISEL killed %1, 0, csr_amdgpu_gfx90ainsts, implicit $sgpr16
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ADJCALLSTACKDOWN 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
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S_ENDPGM 0
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...
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# Baseline: a VGPR_32 ScalarOp is already a legal V_READFIRSTLANE_B32
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# source, so no extra COPY should appear in the loop header and
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# V_READFIRSTLANE_B32 should read the original VGPR directly.
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---
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name: waterfall_si_call_inreg_vgpr32
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tracksRegLiveness: true
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frameInfo:
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adjustsStack: true
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hasCalls: true
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machineFunctionInfo:
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scratchRSrcReg: '$sgpr0_sgpr1_sgpr2_sgpr3'
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stackPtrOffsetReg: '$sgpr32'
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occupancy: 8
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body: |
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; CHECK-LABEL: name: waterfall_si_call_inreg_vgpr32
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; CHECK: bb.0:
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; CHECK: [[SRC:%[0-9]+]]:vgpr_32 = COPY $vgpr0
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; CHECK: [[DEST:%[0-9]+]]:sreg_64_xexec = COPY $sgpr4_sgpr5
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; CHECK: bb.1:
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; CHECK-NOT: vgpr_32 = COPY [[SRC]]
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; CHECK: [[LANE:%[0-9]+]]:sreg_32_xm0 = V_READFIRSTLANE_B32 [[SRC]], implicit $exec
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; CHECK: {{.*}}:sreg_64_xexec = V_CMP_EQ_U32_e64 [[LANE]], [[SRC]], implicit $exec
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bb.0:
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liveins: $vgpr0, $sgpr4_sgpr5
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%0:vgpr_32 = COPY $vgpr0
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%1:sreg_64_xexec = COPY $sgpr4_sgpr5
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ADJCALLSTACKUP 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
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$sgpr16 = COPY %0
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SI_CALL_ISEL killed %1, 0, csr_amdgpu_gfx90ainsts, implicit $sgpr16
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ADJCALLSTACKDOWN 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
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S_ENDPGM 0
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...
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