derek.holloway
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73 lines
2.5 KiB
YAML
73 lines
2.5 KiB
YAML
# RUN: llc -mtriple=hexagon -run-pass pipeliner -debug-only=pipeliner %s -o /dev/null 2>&1 | FileCheck %s
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# REQUIRES: asserts
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# Test that pipeliner correctly detects the loop-carried dependency between the
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# load and the store, which is indicated by `Ord` dependency from SU(2) to
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# SU(4). Note that there is no dependency within a single iteration.
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# CHECK: SU(2): %7:intregs = L2_loadri_io %5:intregs, 0 :: (load (s32) from %ir.ptr.load)
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# CHECK-NEXT: # preds left
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# CHECK-NEXT: # succs left
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# CHECK-NEXT: # rdefs left
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# CHECK-NEXT: Latency
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# CHECK-NEXT: Depth
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# CHECK-NEXT: Height
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# CHECK-NEXT: Predecessors:
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# CHECK-NEXT: SU(0): Data Latency=0 Reg=%5
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# CHECK-NEXT: Successors:
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# CHECK-DAG: SU(3): Data Latency=2 Reg=%7
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# CHECK-DAG: SU(4): Ord Latency=1 Barrier
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# CHECK-NEXT: SU(3): %8:intregs = F2_sfadd %7:intregs, %3:intregs, implicit $usr
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# CHECK: SU(4): S2_storeri_io %6:intregs, 0, %8:intregs :: (store (s32) into %ir.ptr.store)
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--- |
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define void @foo(ptr noalias %p0, ptr noalias %p1, i32 %n) {
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entry:
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br label %body
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body: ; preds = %body, %entry
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%i = phi i32 [ 0, %entry ], [ %i.next, %body ]
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%ptr.load = phi ptr [ %p0, %entry ], [ %p1, %body ]
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%ptr.store = phi ptr [ %p1, %entry ], [ %p0, %body ]
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%v = load float, ptr %ptr.load, align 4
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%add = fadd float %v, 1.000000e+00
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store float %add, ptr %ptr.store, align 4
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%i.next = add i32 %i, 1
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%cond = icmp slt i32 %i.next, %n
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br i1 %cond, label %body, label %exit
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exit: ; preds = %body
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ret void
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}
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...
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---
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name: foo
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tracksRegLiveness: true
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body: |
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bb.0.entry:
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successors: %bb.1(0x80000000)
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liveins: $r0, $r1, $r2
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%6:intregs = COPY $r2
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%5:intregs = COPY $r1
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%4:intregs = COPY $r0
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%9:intregs = A2_tfrsi 1065353216
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%12:intregs = COPY %6
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J2_loop0r %bb.1, %12, implicit-def $lc0, implicit-def $sa0, implicit-def $usr
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bb.1.body (machine-block-address-taken):
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successors: %bb.1(0x7c000000), %bb.2(0x04000000)
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%1:intregs = PHI %4, %bb.0, %5, %bb.1
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%2:intregs = PHI %5, %bb.0, %4, %bb.1
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%8:intregs = L2_loadri_io %1, 0 :: (load (s32) from %ir.ptr.load)
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%10:intregs = F2_sfadd killed %8, %9, implicit $usr
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S2_storeri_io %2, 0, killed %10 :: (store (s32) into %ir.ptr.store)
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ENDLOOP0 %bb.1, implicit-def $pc, implicit-def $lc0, implicit $sa0, implicit $lc0
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J2_jump %bb.2, implicit-def dead $pc
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bb.2.exit:
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PS_jmpret $r31, implicit-def dead $pc
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...
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