reference, declarationdefinition
definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
unreferenced
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# RUN: llc -mtriple=hexagon -run-pass pipeliner -debug-only=pipeliner %s -o /dev/null 2>&1 -pipeliner-experimental-cg=true | FileCheck %s
# REQUIRES: asserts

# Test that the loop carried dependence check correctly identifies a recurrence.

# CHECK: Rec NodeSet
# CHECK: Rec NodeSet
# CHECK: Rec NodeSet
# CHECK: Rec NodeSet
# CHECK-NEXT: SU(4)
# CHECK-NEXT: SU(6)

--- |
  
  %struct.A = type { i16, i16 }
  
  define i32 @test(%struct.A* noalias nocapture %s, i16* noalias nocapture readonly %r, i32 %n) {
  entry:
    %cmp19 = icmp eq i32 %n, 2
    br i1 %cmp19, label %for.end, label %for.body.preheader
  
  for.body.preheader:
    %0 = add i32 %n, -2
    %cgep = getelementptr %struct.A, %struct.A* %s, i32 2, i32 1
    %scevgep1 = bitcast i16* %cgep to %struct.A*
    %cgep9 = getelementptr i16, i16* %r, i32 2
    br label %for.body
  
  for.body:
    %lsr.iv7 = phi i16* [ %cgep9, %for.body.preheader ], [ %cgep12, %for.body ]
    %lsr.iv2 = phi %struct.A* [ %scevgep1, %for.body.preheader ], [ %cgep11, %for.body ]
    %lsr.iv = phi i32 [ %0, %for.body.preheader ], [ %lsr.iv.next, %for.body ]
    %sum.020 = phi i32 [ %add7, %for.body ], [ 0, %for.body.preheader ]
    %lsr.iv24 = bitcast %struct.A* %lsr.iv2 to i16*
    %1 = load i16, i16* %lsr.iv7, align 2
    %conv = sext i16 %1 to i32
    %cgep10 = getelementptr i16, i16* %lsr.iv24, i32 -4
    %2 = load i16, i16* %cgep10, align 2
    %conv2 = sext i16 %2 to i32
    %add = add i16 %1, 10
    store i16 %add, i16* %lsr.iv24, align 2
    %add6 = add i32 %sum.020, %conv
    %add7 = add i32 %add6, %conv2
    %lsr.iv.next = add i32 %lsr.iv, -1
    %cmp = icmp eq i32 %lsr.iv.next, 0
    %cgep11 = getelementptr %struct.A, %struct.A* %lsr.iv2, i32 1
    %cgep12 = getelementptr i16, i16* %lsr.iv7, i32 1
    br i1 %cmp, label %for.end, label %for.body
  
  for.end:
    %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add7, %for.body ]
    ret i32 %sum.0.lcssa
  }
  
...
---
name:            test
tracksRegLiveness: true

body:             |
  bb.0:
    successors: %bb.3, %bb.1
    liveins: $r0, $r1, $r2
  
    %14:intregs = COPY $r2
    %13:intregs = COPY $r1
    %12:intregs = COPY $r0
    %16:predregs = C2_cmpeqi %14, 2
    %15:intregs = A2_tfrsi 0
    J2_jumpt killed %16, %bb.3, implicit-def dead $pc
    J2_jump %bb.1, implicit-def dead $pc
  
  bb.1:
    successors: %bb.2
  
    %0:intregs = A2_addi %14, -2
    %1:intregs = A2_addi %12, 10
    %2:intregs = A2_addi %13, 4
    %17:intregs = A2_tfrsi 0
    %23:intregs = COPY %0
    J2_loop0r %bb.2, %23, implicit-def $lc0, implicit-def $sa0, implicit-def $usr
  
  bb.2 (address-taken):
    successors: %bb.3, %bb.2
  
    %3:intregs = PHI %2, %bb.1, %10, %bb.2
    %4:intregs = PHI %1, %bb.1, %9, %bb.2
    %6:intregs = PHI %17, %bb.1, %7, %bb.2
    %18:intregs, %10:intregs = L2_loadrh_pi %3, 2 :: (load 2 from %ir.lsr.iv7)
    %19:intregs = L2_loadrh_io %4, -8 :: (load 2 from %ir.cgep10)
    %20:intregs = A2_addi %18, 10
    S2_storerh_io %4, 0, killed %20 :: (store 2 into %ir.lsr.iv24)
    %7:intregs = M2_acci %19, %6, %18
    %9:intregs = A2_addi %4, 4
    ENDLOOP0 %bb.2, implicit-def $pc, implicit-def $lc0, implicit $sa0, implicit $lc0
    J2_jump %bb.3, implicit-def dead $pc
  
  bb.3:
    %11:intregs = PHI %15, %bb.0, %7, %bb.2
    $r0 = COPY %11
    PS_jmpret $r31, implicit-def dead $pc, implicit $r0

...