derek.holloway
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66 lines
3.7 KiB
YAML
66 lines
3.7 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
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# RUN: llc -mtriple=hexagon -hexagon-mcr=true -run-pass=machine-combiner\
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# RUN: %s -o - | FileCheck %s --check-prefix=ENABLED
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# RUN: llc -mtriple=hexagon -hexagon-mcr=false -run-pass=machine-combiner\
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# RUN: %s -o - | FileCheck %s --check-prefix=DISABLED
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# Test that demonstrates the machine-combiner pass performing reassociation
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# to improve instruction-level parallelism (ILP) by breaking dependency chains.
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--- |
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define float @test_reassoc_chain(float* nocapture readonly %a) {
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ret float 0.0
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}
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...
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---
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# Test a longer chain: ((A + B) + C) + D
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# Should reassociate to optimize the critical path
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# Verify we still have 3 F2_sfadd instructions but in optimized order
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# Original chain should be preserved
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name: test_reassoc_chain
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $r0
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; ENABLED-LABEL: name: test_reassoc_chain
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; ENABLED: liveins: $r0
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; ENABLED-NEXT: {{ $}}
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; ENABLED-NEXT: [[COPY:%[0-9]+]]:intregs = COPY $r0
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; ENABLED-NEXT: [[L2_loadri_io:%[0-9]+]]:intregs = L2_loadri_io [[COPY]], 0
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; ENABLED-NEXT: [[L2_loadri_io1:%[0-9]+]]:intregs = L2_loadri_io [[COPY]], 4
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; ENABLED-NEXT: [[F2_sfadd:%[0-9]+]]:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed [[L2_loadri_io1]], killed [[L2_loadri_io]], implicit $usr
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; ENABLED-NEXT: [[L2_loadri_io2:%[0-9]+]]:intregs = L2_loadri_io [[COPY]], 8
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; ENABLED-NEXT: [[L2_loadri_io3:%[0-9]+]]:intregs = L2_loadri_io [[COPY]], 12
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; ENABLED-NEXT: [[F2_sfadd1:%[0-9]+]]:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed [[L2_loadri_io2]], killed [[L2_loadri_io3]], implicit $usr
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; ENABLED-NEXT: [[F2_sfadd2:%[0-9]+]]:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed [[F2_sfadd]], killed [[F2_sfadd1]], implicit $usr
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; ENABLED-NEXT: $r0 = COPY [[F2_sfadd2]]
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; ENABLED-NEXT: PS_jmpret $r31, implicit-def dead $pc, implicit $r0
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;
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; DISABLED-LABEL: name: test_reassoc_chain
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; DISABLED: liveins: $r0
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; DISABLED-NEXT: {{ $}}
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; DISABLED-NEXT: [[COPY:%[0-9]+]]:intregs = COPY $r0
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; DISABLED-NEXT: [[L2_loadri_io:%[0-9]+]]:intregs = L2_loadri_io [[COPY]], 0
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; DISABLED-NEXT: [[L2_loadri_io1:%[0-9]+]]:intregs = L2_loadri_io [[COPY]], 4
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; DISABLED-NEXT: [[F2_sfadd:%[0-9]+]]:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed [[L2_loadri_io1]], killed [[L2_loadri_io]], implicit $usr
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; DISABLED-NEXT: [[L2_loadri_io2:%[0-9]+]]:intregs = L2_loadri_io [[COPY]], 8
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; DISABLED-NEXT: [[L2_loadri_io3:%[0-9]+]]:intregs = L2_loadri_io [[COPY]], 12
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; DISABLED-NEXT: [[F2_sfadd1:%[0-9]+]]:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed [[L2_loadri_io2]], killed [[L2_loadri_io3]], implicit $usr
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; DISABLED-NEXT: [[F2_sfadd2:%[0-9]+]]:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed [[F2_sfadd]], killed [[F2_sfadd1]], implicit $usr
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; DISABLED-NEXT: $r0 = COPY [[F2_sfadd2]]
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; DISABLED-NEXT: PS_jmpret $r31, implicit-def dead $pc, implicit $r0
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%0:intregs = COPY $r0
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%1:intregs = L2_loadri_io %0:intregs, 0
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%2:intregs = L2_loadri_io %0:intregs, 4
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%3:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed %2:intregs, killed %1:intregs, implicit $usr
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%4:intregs = L2_loadri_io %0:intregs, 8
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%5:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed %3:intregs, killed %4:intregs, implicit $usr
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%6:intregs = L2_loadri_io %0:intregs, 12
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%7:intregs = nnan ninf nsz arcp contract afn reassoc F2_sfadd killed %5:intregs, killed %6:intregs, implicit $usr
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$r0 = COPY %7:intregs
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PS_jmpret $r31, implicit-def dead $pc, implicit $r0
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...
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