llvm/test/Transforms/InstCombine/vec_shuffle-phi-multiuse.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -S -passes=instcombine | FileCheck %s

define <4 x i16> @f0(i1 %c, ptr %p0, ptr %p1) {
; CHECK-LABEL: define <4 x i16> @f0(
; CHECK-SAME: i1 [[C:%.*]], ptr [[P0:%.*]], ptr [[P1:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 [[C]], label %[[THEN:.*]], label %[[MERGE:.*]]
; CHECK:       [[THEN]]:
; CHECK-NEXT:    [[LOAD0:%.*]] = load <4 x i16>, ptr [[P0]], align 16
; CHECK-NEXT:    [[LOAD1:%.*]] = load <4 x i16>, ptr [[P1]], align 16
; CHECK-NEXT:    [[TMP0:%.*]] = sub <4 x i16> [[LOAD0]], [[LOAD1]]
; CHECK-NEXT:    br label %[[MERGE]]
; CHECK:       [[MERGE]]:
; CHECK-NEXT:    [[SUB:%.*]] = phi <4 x i16> [ <i16 -87, i16 327, i16 51, i16 755>, %[[ENTRY]] ], [ [[TMP0]], %[[THEN]] ]
; CHECK-NEXT:    ret <4 x i16> [[SUB]]
;
entry:
  br i1 %c, label %then, label %merge

then:
  %load0 = load <4 x i16>, ptr %p0, align 16
  %load1 = load <4 x i16>, ptr %p1, align 16
  %interleave = shufflevector <4 x i16> %load0, <4 x i16> %load1, <8 x i32> <i32 0, i32 7, i32 1, i32 6, i32 2, i32 5, i32 3, i32 4>
  br label %merge

merge:
  %phi = phi <8 x i16> [<i16 1, i16 22, i16 333, i16 4, i16 55, i16 6, i16 777, i16 88>, %entry], [%interleave, %then]
  %shuf0 = shufflevector <8 x i16> %phi, <8 x i16> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
  %shuf1 = shufflevector <8 x i16> %phi, <8 x i16> poison, <4 x i32> <i32 7, i32 5, i32 3, i32 1>
  %sub = sub <4 x i16> %shuf0, %shuf1
  ret <4 x i16> %sub
}

define void @deinterleave_interleave(ptr %p_begin, ptr %p_end, ptr %out) {
; CHECK-LABEL: define void @deinterleave_interleave(
; CHECK-SAME: ptr [[P_BEGIN:%.*]], ptr [[P_END:%.*]], ptr [[OUT:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[ACC:%.*]] = phi <4 x float> [ zeroinitializer, %[[ENTRY]] ], [ [[SUM_LOWS:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[ODDS:%.*]] = phi <4 x float> [ zeroinitializer, %[[ENTRY]] ], [ [[SUM_HIGHS:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[P:%.*]] = phi ptr [ [[P_BEGIN]], %[[ENTRY]] ], [ [[P_INC:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[VAL:%.*]] = load <4 x i8>, ptr [[P]], align 4
; CHECK-NEXT:    [[HIGHS:%.*]] = ashr <4 x i8> [[VAL]], splat (i8 4)
; CHECK-NEXT:    [[LOWS:%.*]] = and <4 x i8> [[VAL]], splat (i8 15)
; CHECK-NEXT:    [[HIGHS_F:%.*]] = sitofp <4 x i8> [[HIGHS]] to <4 x float>
; CHECK-NEXT:    [[LOWS_F:%.*]] = uitofp nneg <4 x i8> [[LOWS]] to <4 x float>
; CHECK-NEXT:    [[SUM_LOWS]] = fadd <4 x float> [[ACC]], [[LOWS_F]]
; CHECK-NEXT:    [[SUM_HIGHS]] = fadd <4 x float> [[ODDS]], [[HIGHS_F]]
; CHECK-NEXT:    [[P_INC]] = getelementptr inbounds nuw i8, ptr [[P]], i64 4
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[P_INC]], [[P_END]]
; CHECK-NEXT:    br i1 [[C]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[INTERLEAVE:%.*]] = shufflevector <4 x float> [[SUM_LOWS]], <4 x float> [[SUM_HIGHS]], <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>
; CHECK-NEXT:    store <8 x float> [[INTERLEAVE]], ptr [[OUT]], align 4
; CHECK-NEXT:    ret void
;
entry:
  br label %loop

loop:
  %acc = phi <8 x float> [ zeroinitializer, %entry ], [ %interleave, %loop ]
  %p = phi ptr [%p_begin, %entry ], [%p_inc, %loop]

  %evens = shufflevector <8 x float> %acc, <8 x float> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
  %odds = shufflevector <8 x float> %acc, <8 x float> poison, <4 x i32> <i32 1, i32 3, i32 5, i32 7>

  %val = load <4 x i8>, ptr %p, align 4
  %highs = ashr <4 x i8> %val, <i8 4, i8 4, i8 4, i8 4>
  %lows = and <4 x i8> %val, <i8 15, i8 15, i8 15, i8 15>

  %highs_f = sitofp <4 x i8> %highs to <4 x float>
  %lows_f = sitofp <4 x i8> %lows to <4 x float>

  %sum_lows = fadd <4 x float> %evens, %lows_f
  %sum_highs = fadd <4 x float> %odds, %highs_f

  %interleave = shufflevector <4 x float> %sum_lows, <4 x float> %sum_highs, <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>

  %p_inc = getelementptr inbounds i8, ptr %p, i32 4
  %c = icmp eq ptr %p_inc, %p_end
  br i1 %c, label %exit, label %loop

exit:
  store <8 x float> %interleave, ptr %out, align 4
  ret void
}

define <4 x i16> @f1(i1 %c, ptr %p) {
; CHECK-LABEL: define <4 x i16> @f1(
; CHECK-SAME: i1 [[C:%.*]], ptr [[P:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 [[C]], label %[[THEN:.*]], label %[[MERGE:.*]]
; CHECK:       [[THEN]]:
; CHECK-NEXT:    store i32 42, ptr [[P]], align 4
; CHECK-NEXT:    br label %[[MERGE]]
; CHECK:       [[MERGE]]:
; CHECK-NEXT:    [[XOR:%.*]] = phi <4 x i16> [ <i16 3, i16 346, i16 undef, i16 undef>, %[[ENTRY]] ], [ <i16 7, i16 74, i16 undef, i16 undef>, %[[THEN]] ]
; CHECK-NEXT:    ret <4 x i16> [[XOR]]
;
entry:
  br i1 %c, label %then, label %merge

then:
  store i32 42, ptr %p, align 4
  br label %merge

merge:
  %phi = phi <4 x i16> [<i16 1, i16 22, i16 333, i16 4>, %entry], [<i16 555, i16 6, i16 77, i16 8>, %then]
  %shuf0 = shufflevector <4 x i16> %phi, <4 x i16> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
  %add1 = add <4 x i16> %phi, <i16 1, i16 1, i16 1, i16 1>
  %xor = xor <4 x i16> %shuf0, %add1
  ret <4 x i16> %xor
}