5231736329
M0 can only be written to by the SALU, so `v_readfirstlane_b32 m0` is effectively useless. Represent this by restricting the dest RC of that instruction to `SReg_32_XM0` which excludes M0. There is a lot of test changes due to the register class changing, but most changes are trivial. In some cases, an extra register and `s_mov_b32` is needed. Fixes SWDEV-513269
63 lines
1.8 KiB
YAML
63 lines
1.8 KiB
YAML
# RUN: llc -mtriple=amdgcn -verify-machineinstrs -run-pass si-load-store-opt -o - %s | FileCheck %s
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# Check that SILoadStoreOptimizer honors physregs defs/uses between moved
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# instructions.
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#
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# The following IR snippet would usually be optimized by the peephole optimizer.
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# However, an equivalent situation can occur with buffer instructions as well.
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# CHECK-LABEL: name: scc_def_and_use_no_dependency
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# CHECK: DS_READ2_B32
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# CHECK: S_ADD_U32
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# CHECK: S_ADDC_U32
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---
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name: scc_def_and_use_no_dependency
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machineFunctionInfo:
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isEntryFunction: true
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body: |
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bb.0:
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liveins: $vgpr0, $sgpr0
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%1:vgpr_32 = COPY $vgpr0
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%10:sgpr_32 = COPY $sgpr0
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$m0 = S_MOV_B32 -1
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%2:vgpr_32 = DS_READ_B32 %1, 0, 0, implicit $m0, implicit $exec :: (load (s32))
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%11:sgpr_32 = S_ADD_U32 %10, 4, implicit-def $scc
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%12:sgpr_32 = S_ADDC_U32 %10, 0, implicit-def dead $scc, implicit $scc
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%3:vgpr_32 = DS_READ_B32 %1, 64, 0, implicit $m0, implicit $exec :: (load (s32))
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S_ENDPGM 0
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...
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# CHECK-LABEL: name: scc_def_and_use_dependency
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# CHECK: DS_READ2_B32
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# CHECK: S_ADD_U32
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# CHECK: S_ADDC_U32
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---
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name: scc_def_and_use_dependency
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machineFunctionInfo:
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isEntryFunction: true
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body: |
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bb.0:
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liveins: $vgpr0, $sgpr0
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%1:vgpr_32 = COPY $vgpr0
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%10:sgpr_32 = COPY $sgpr0
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$m0 = S_MOV_B32 -1
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%2:vgpr_32 = DS_READ_B32 %1, 0, 0, implicit $m0, implicit $exec :: (load (s32))
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%20:sreg_32_xm0 = V_READFIRSTLANE_B32 %2, implicit $exec
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%21:sgpr_32 = S_ADD_U32 %20, 4, implicit-def $scc
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; The S_ADDC_U32 depends on the first DS_READ_B32 only via SCC
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%11:sgpr_32 = S_ADDC_U32 %10, 0, implicit-def dead $scc, implicit $scc
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%3:vgpr_32 = DS_READ_B32 %1, 64, 0, implicit $m0, implicit $exec :: (load (s32))
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S_ENDPGM 0
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...
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