; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt -S -mcpu=gfx900 -amdgpu-lower-buffer-fat-pointers < %s | FileCheck %s
; RUN: opt -S -mcpu=gfx900 -passes=amdgpu-lower-buffer-fat-pointers < %s | FileCheck %s

target triple = "amdgcn--"

;; This should optimize to just the offset part
define float @sum(ptr addrspace(8) %buf, i32 %len) {
; CHECK-LABEL: define float @sum
; CHECK-SAME: (ptr addrspace(8) [[BUF:%.*]], i32 [[LEN:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_OFF:%.*]] = phi i32 [ [[PTR:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[BUF]], i32 [[PTR_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM_PREV]], [[VAL]]
; CHECK-NEXT:    [[PTR]] = add i32 [[PTR_PREV_OFF]], 4
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
; CHECK-NEXT:    br i1 [[TEST]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf to ptr addrspace(7)
  br label %loop
loop:
  %sum.prev = phi float [ %sum, %loop ], [ 0.0, %entry ]
  %ptr.prev = phi ptr addrspace(7) [ %ptr, %loop ], [ %start, %entry ]
  %i = phi i32 [ %i.next, %loop ], [ 0, %entry ]

  %val = load float, ptr addrspace(7) %ptr.prev
  %sum = fadd float %sum.prev, %val

  %ptr = getelementptr float, ptr addrspace(7) %ptr.prev, i32 1
  %i.next = add i32 %i, 1
  %test = icmp ult i32 %i.next, %len
  br i1 %test, label %loop, label %exit
exit:
  ret float %sum
}

;; But this should not
define float @sum_integer_ops(ptr addrspace(8) %buf, i32 %len) {
; CHECK-LABEL: define float @sum_integer_ops
; CHECK-SAME: (ptr addrspace(8) [[BUF:%.*]], i32 [[LEN:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_RSRC:%.*]] = phi ptr addrspace(8) [ [[PTR_RSRC:%.*]], [[LOOP]] ], [ [[BUF]], [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_OFF:%.*]] = phi i32 [ [[PTR_OFF:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[PTR_PREV_RSRC]], i32 [[PTR_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM_PREV]], [[VAL]]
; CHECK-NEXT:    [[PTR_PREV_INT_RSRC:%.*]] = ptrtoint ptr addrspace(8) [[PTR_PREV_RSRC]] to i160
; CHECK-NEXT:    [[TMP0:%.*]] = shl nuw i160 [[PTR_PREV_INT_RSRC]], 32
; CHECK-NEXT:    [[PTR_PREV_INT_OFF:%.*]] = zext i32 [[PTR_PREV_OFF]] to i160
; CHECK-NEXT:    [[PTR_PREV_INT:%.*]] = or i160 [[TMP0]], [[PTR_PREV_INT_OFF]]
; CHECK-NEXT:    [[PTR_INT:%.*]] = add i160 [[PTR_PREV_INT]], 4
; CHECK-NEXT:    [[TMP1:%.*]] = lshr i160 [[PTR_INT]], 32
; CHECK-NEXT:    [[TMP2:%.*]] = trunc i160 [[TMP1]] to i128
; CHECK-NEXT:    [[PTR_RSRC]] = inttoptr i128 [[TMP2]] to ptr addrspace(8)
; CHECK-NEXT:    [[PTR_OFF]] = trunc i160 [[PTR_INT]] to i32
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
; CHECK-NEXT:    br i1 [[TEST]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf to ptr addrspace(7)
  br label %loop
loop:
  %sum.prev = phi float [ %sum, %loop ], [ 0.0, %entry ]
  %ptr.prev = phi ptr addrspace(7) [ %ptr, %loop ], [ %start, %entry ]
  %i = phi i32 [ %i.next, %loop ], [ 0, %entry ]

  %val = load float, ptr addrspace(7) %ptr.prev
  %sum = fadd float %sum.prev, %val

  %ptr.prev.int = ptrtoint ptr addrspace(7) %ptr.prev to i160
  %ptr.int = add i160 %ptr.prev.int, 4
  %ptr = inttoptr i160 %ptr.int to ptr addrspace(7)
  %i.next = add i32 %i, 1
  %test = icmp ult i32 %i.next, %len
  br i1 %test, label %loop, label %exit
exit:
  ret float %sum
}

;; Should go to offsets only
define float @sum_2d(ptr addrspace(8) %buf, i32 %ii, i32 %jj) {
; CHECK-LABEL: define float @sum_2d
; CHECK-SAME: (ptr addrspace(8) [[BUF:%.*]], i32 [[II:%.*]], i32 [[JJ:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP1_ENTRY:%.*]]
; CHECK:       loop1.entry:
; CHECK-NEXT:    [[SUM1_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP1_EXIT:%.*]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP1_EXIT]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[PTR1_PREV_OFF:%.*]] = phi i32 [ [[PTR1:%.*]], [[LOOP1_EXIT]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    br label [[LOOP2:%.*]]
; CHECK:       loop2:
; CHECK-NEXT:    [[SUM2_PREV:%.*]] = phi float [ [[SUM]], [[LOOP2]] ], [ [[SUM1_PREV]], [[LOOP1_ENTRY]] ]
; CHECK-NEXT:    [[J:%.*]] = phi i32 [ [[J_NEXT:%.*]], [[LOOP2]] ], [ 0, [[LOOP1_ENTRY]] ]
; CHECK-NEXT:    [[PTR2_PREV_OFF:%.*]] = phi i32 [ [[PTR2:%.*]], [[LOOP2]] ], [ [[PTR1_PREV_OFF]], [[LOOP1_ENTRY]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[BUF]], i32 [[PTR2_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM2_PREV]], [[VAL]]
; CHECK-NEXT:    [[PTR2]] = add i32 [[PTR2_PREV_OFF]], 4
; CHECK-NEXT:    [[J_NEXT]] = add i32 [[J]], 1
; CHECK-NEXT:    [[TEST2:%.*]] = icmp ult i32 [[J_NEXT]], [[JJ]]
; CHECK-NEXT:    br i1 [[TEST2]], label [[LOOP2]], label [[LOOP1_EXIT]]
; CHECK:       loop1.exit:
; CHECK-NEXT:    [[PTR1]] = add i32 [[PTR2]], 4
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST1:%.*]] = icmp ult i32 [[I_NEXT]], [[II]]
; CHECK-NEXT:    br i1 [[TEST1]], label [[LOOP1_ENTRY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf to ptr addrspace(7)
  br label %loop1.entry
loop1.entry:
  %sum1.prev = phi float [ %sum, %loop1.exit ], [ 0.0, %entry ]
  %ptr1.prev = phi ptr addrspace(7) [ %ptr1, %loop1.exit ], [ %start, %entry ]
  %i = phi i32 [ %i.next, %loop1.exit ], [ 0, %entry ]

  br label %loop2
loop2:
  %sum2.prev = phi float [ %sum, %loop2 ], [ %sum1.prev, %loop1.entry ]
  %ptr2.prev = phi ptr addrspace(7) [ %ptr2, %loop2 ], [ %ptr1.prev, %loop1.entry ]
  %j = phi i32 [ %j.next, %loop2 ], [ 0, %loop1.entry ]

  %val = load float, ptr addrspace(7) %ptr2.prev
  %sum = fadd float %sum2.prev, %val

  %ptr2 = getelementptr float, ptr addrspace(7) %ptr2.prev, i32 1
  %j.next = add i32 %j, 1
  %test2 = icmp ult i32 %j.next, %jj

  br i1 %test2, label %loop2, label %loop1.exit
loop1.exit:
  %ptr1 = getelementptr float, ptr addrspace(7) %ptr2, i32 1
  %i.next = add i32 %i, 1
  %test1 = icmp ult i32 %i.next, %ii
  br i1 %test1, label %loop1.entry, label %exit
exit:
  ret float %sum
}

;; This should optimize to just the offset parts since all the arguments to the
;; select point to the same buffer.
define float @sum_jump_on_negative(ptr addrspace(8) %buf, i32 %len) {
; CHECK-LABEL: define float @sum_jump_on_negative
; CHECK-SAME: (ptr addrspace(8) [[BUF:%.*]], i32 [[LEN:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_OFF:%.*]] = phi i32 [ [[PTR_OFF:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[BUF]], i32 [[PTR_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM_PREV]], [[VAL]]
; CHECK-NEXT:    [[SKIP_NEXT:%.*]] = fcmp olt float [[VAL]], 0.000000e+00
; CHECK-NEXT:    [[SMALL_JUMP:%.*]] = add i32 [[PTR_PREV_OFF]], 4
; CHECK-NEXT:    [[LARGE_JUMP:%.*]] = add i32 [[PTR_PREV_OFF]], 8
; CHECK-NEXT:    [[PTR_OFF]] = select i1 [[SKIP_NEXT]], i32 [[LARGE_JUMP]], i32 [[SMALL_JUMP]]
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
; CHECK-NEXT:    br i1 [[TEST]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf to ptr addrspace(7)
  br label %loop
loop:
  %sum.prev = phi float [ %sum, %loop ], [ 0.0, %entry ]
  %ptr.prev = phi ptr addrspace(7) [ %ptr, %loop ], [ %start, %entry ]
  %i = phi i32 [ %i.next, %loop ], [ 0, %entry ]

  %val = load float, ptr addrspace(7) %ptr.prev
  %sum = fadd float %sum.prev, %val

  %skip.next = fcmp olt float %val, 0.0
  %small.jump = getelementptr float, ptr addrspace(7) %ptr.prev, i32 1
  %large.jump = getelementptr float, ptr addrspace(7) %ptr.prev, i32 2
  %ptr = select i1 %skip.next, ptr addrspace(7) %large.jump, ptr addrspace(7) %small.jump

  %i.next = add i32 %i, 1
  %test = icmp ult i32 %i.next, %len
  br i1 %test, label %loop, label %exit
exit:
  ret float %sum
}

define float @sum_jump_on_negative_with_phi(ptr addrspace(8) %buf, i32 %len) {
; CHECK-LABEL: define float @sum_jump_on_negative_with_phi
; CHECK-SAME: (ptr addrspace(8) [[BUF:%.*]], i32 [[LEN:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP_EXIT:%.*]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP_EXIT]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_OFF:%.*]] = phi i32 [ [[PTR_OFF:%.*]], [[LOOP_EXIT]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[BUF]], i32 [[PTR_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM_PREV]], [[VAL]]
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
; CHECK-NEXT:    [[SKIP_NEXT:%.*]] = fcmp olt float [[VAL]], 0.000000e+00
; CHECK-NEXT:    br i1 [[SKIP_NEXT]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[LARGE_JUMP:%.*]] = add i32 [[PTR_PREV_OFF]], 8
; CHECK-NEXT:    br label [[LOOP_EXIT]]
; CHECK:       else:
; CHECK-NEXT:    [[SMALL_JUMP:%.*]] = add i32 [[PTR_PREV_OFF]], 4
; CHECK-NEXT:    br label [[LOOP_EXIT]]
; CHECK:       loop.exit:
; CHECK-NEXT:    [[PTR_OFF]] = phi i32 [ [[LARGE_JUMP]], [[THEN]] ], [ [[SMALL_JUMP]], [[ELSE]] ]
; CHECK-NEXT:    br i1 [[TEST]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf to ptr addrspace(7)
  br label %loop
loop:
  %sum.prev = phi float [ %sum, %loop.exit ], [ 0.0, %entry ]
  %ptr.prev = phi ptr addrspace(7) [ %ptr, %loop.exit ], [ %start, %entry ]
  %i = phi i32 [ %i.next, %loop.exit ], [ 0, %entry ]

  %val = load float, ptr addrspace(7) %ptr.prev
  %sum = fadd float %sum.prev, %val

  %i.next = add i32 %i, 1
  %test = icmp ult i32 %i.next, %len

  %skip.next = fcmp olt float %val, 0.0
  br i1 %skip.next, label %then, label %else
then:
  %large.jump = getelementptr float, ptr addrspace(7) %ptr.prev, i32 2
  br label %loop.exit
else:
  %small.jump = getelementptr float, ptr addrspace(7) %ptr.prev, i32 1
  br label %loop.exit
loop.exit:
  %ptr = phi ptr addrspace(7) [ %large.jump, %then ], [ %small.jump, %else ]
  br i1 %test, label %loop, label %exit
exit:
  ret float %sum
}

;; But this has a shifting resource part.
define float @sum_new_buffer_on_negative(ptr addrspace(8) %buf1, ptr addrspace(8) %buf2, i32 %len) {
; CHECK-LABEL: define float @sum_new_buffer_on_negative
; CHECK-SAME: (ptr addrspace(8) [[BUF1:%.*]], ptr addrspace(8) [[BUF2:%.*]], i32 [[LEN:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_RSRC:%.*]] = phi ptr addrspace(8) [ [[PTR_RSRC:%.*]], [[LOOP]] ], [ [[BUF1]], [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_OFF:%.*]] = phi i32 [ [[PTR_OFF:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[PTR_PREV_RSRC]], i32 [[PTR_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM_PREV]], [[VAL]]
; CHECK-NEXT:    [[HOP:%.*]] = fcmp olt float [[VAL]], 0.000000e+00
; CHECK-NEXT:    [[THIS_NEXT:%.*]] = add i32 [[PTR_PREV_OFF]], 4
; CHECK-NEXT:    [[PTR_RSRC]] = select i1 [[HOP]], ptr addrspace(8) [[PTR_PREV_RSRC]], ptr addrspace(8) [[BUF2]]
; CHECK-NEXT:    [[PTR_OFF]] = select i1 [[HOP]], i32 [[THIS_NEXT]], i32 0
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
; CHECK-NEXT:    br i1 [[TEST]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf1 to ptr addrspace(7)
  %start2 = addrspacecast ptr addrspace(8) %buf2 to ptr addrspace(7)
  br label %loop
loop:
  %sum.prev = phi float [ %sum, %loop ], [ 0.0, %entry ]
  %ptr.prev = phi ptr addrspace(7) [ %ptr, %loop ], [ %start, %entry ]
  %i = phi i32 [ %i.next, %loop ], [ 0, %entry ]

  %val = load float, ptr addrspace(7) %ptr.prev
  %sum = fadd float %sum.prev, %val

  %hop = fcmp olt float %val, 0.0
  %this.next = getelementptr float, ptr addrspace(7) %ptr.prev, i32 1
  %ptr = select i1 %hop, ptr addrspace(7) %this.next, ptr addrspace(7) %start2

  %i.next = add i32 %i, 1
  %test = icmp ult i32 %i.next, %len
  br i1 %test, label %loop, label %exit
exit:
  ret float %sum
}

;; As does this.
define float @sum_new_buffer_on_negative_with_phi(ptr addrspace(8) %buf1, ptr addrspace(8) %buf2, i32 %len) {
; CHECK-LABEL: define float @sum_new_buffer_on_negative_with_phi
; CHECK-SAME: (ptr addrspace(8) [[BUF1:%.*]], ptr addrspace(8) [[BUF2:%.*]], i32 [[LEN:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP_EXIT:%.*]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP_EXIT]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_RSRC:%.*]] = phi ptr addrspace(8) [ [[PTR_RSRC:%.*]], [[LOOP_EXIT]] ], [ [[BUF1]], [[ENTRY]] ]
; CHECK-NEXT:    [[PTR_PREV_OFF:%.*]] = phi i32 [ [[PTR_OFF:%.*]], [[LOOP_EXIT]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[PTR_PREV_RSRC]], i32 [[PTR_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM_PREV]], [[VAL]]
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
; CHECK-NEXT:    [[HOP:%.*]] = fcmp olt float [[VAL]], 0.000000e+00
; CHECK-NEXT:    br i1 [[HOP]], label [[THEN:%.*]], label [[LOOP_EXIT]]
; CHECK:       then:
; CHECK-NEXT:    [[THIS_NEXT:%.*]] = add i32 [[PTR_PREV_OFF]], 4
; CHECK-NEXT:    br label [[LOOP_EXIT]]
; CHECK:       loop.exit:
; CHECK-NEXT:    [[PTR_RSRC]] = phi ptr addrspace(8) [ [[PTR_PREV_RSRC]], [[THEN]] ], [ [[BUF2]], [[LOOP]] ]
; CHECK-NEXT:    [[PTR_OFF]] = phi i32 [ [[THIS_NEXT]], [[THEN]] ], [ 0, [[LOOP]] ]
; CHECK-NEXT:    br i1 [[TEST]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf1 to ptr addrspace(7)
  %start2 = addrspacecast ptr addrspace(8) %buf2 to ptr addrspace(7)
  br label %loop
loop:
  %sum.prev = phi float [ %sum, %loop.exit ], [ 0.0, %entry ]
  %ptr.prev = phi ptr addrspace(7) [ %ptr, %loop.exit ], [ %start, %entry ]
  %i = phi i32 [ %i.next, %loop.exit ], [ 0, %entry ]

  %val = load float, ptr addrspace(7) %ptr.prev
  %sum = fadd float %sum.prev, %val

  %i.next = add i32 %i, 1
  %test = icmp ult i32 %i.next, %len
  %hop = fcmp olt float %val, 0.0
  br i1 %hop, label %then, label %loop.exit
then:
  %this.next = getelementptr float, ptr addrspace(7) %ptr.prev, i32 1
  br label %loop.exit
loop.exit:
  %ptr = phi ptr addrspace(7) [ %this.next, %then ], [ %start2, %loop ]
  br i1 %test, label %loop, label %exit
exit:
  ret float %sum
}

;; Test that the uniform buffer descriptor optimization works correctly for phi
;; nodes that repeat the same predecessor multiple times.
define float @sum_duplicate_preds(ptr addrspace(8) %buf, i32 %len) {
; CHECK-LABEL: define float @sum_duplicate_preds
; CHECK-SAME: (ptr addrspace(8) [[BUF:%.*]], i32 [[LEN:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP]] ], [ [[SUM]], [[LOOP]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ], [ [[I_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    [[PTR_PREV_OFF:%.*]] = phi i32 [ [[PTR:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ], [ [[PTR]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[BUF]], i32 [[PTR_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM_PREV]], [[VAL]]
; CHECK-NEXT:    [[PTR]] = add i32 [[PTR_PREV_OFF]], 4
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
; CHECK-NEXT:    [[TEST_EXT:%.*]] = zext i1 [[TEST]] to i32
; CHECK-NEXT:    switch i32 [[TEST_EXT]], label [[LOOP]] [
; CHECK-NEXT:      i32 1, label [[LOOP]]
; CHECK-NEXT:      i32 0, label [[EXIT:%.*]]
; CHECK-NEXT:    ]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf to ptr addrspace(7)
  br label %loop
loop:
  %sum.prev = phi float [ %sum, %loop ], [ %sum, %loop ], [ 0.0, %entry ]
  %ptr.prev = phi ptr addrspace(7) [ %ptr, %loop ], [ %start, %entry ], [ %ptr, %loop ]
  %i = phi i32 [ %i.next, %loop ], [ 0, %entry ], [ %i.next, %loop ]

  %val = load float, ptr addrspace(7) %ptr.prev
  %sum = fadd float %sum.prev, %val

  %ptr = getelementptr float, ptr addrspace(7) %ptr.prev, i32 1
  %i.next = add i32 %i, 1
  %test = icmp ult i32 %i.next, %len
  %test.ext = zext i1 %test to i32
  switch i32 %test.ext, label %loop [
  i32 1, label %loop
  i32 0, label %exit
  ]
exit:
  ret float %sum
}

;; And similirly check the "might not be uniform" case.
define float @sum_integer_ops_duplicate_preds(ptr addrspace(8) %buf, i32 %len) {
; CHECK-LABEL: define float @sum_integer_ops_duplicate_preds
; CHECK-SAME: (ptr addrspace(8) [[BUF:%.*]], i32 [[LEN:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM_PREV:%.*]] = phi float [ [[SUM:%.*]], [[LOOP]] ], [ [[SUM]], [[LOOP]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ], [ [[I_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    [[PTR_PREV_RSRC:%.*]] = phi ptr addrspace(8) [ [[PTR_RSRC:%.*]], [[LOOP]] ], [ [[BUF]], [[ENTRY]] ], [ [[PTR_RSRC]], [[LOOP]] ]
; CHECK-NEXT:    [[PTR_PREV_OFF:%.*]] = phi i32 [ [[PTR_OFF:%.*]], [[LOOP]] ], [ 0, [[ENTRY]] ], [ [[PTR_OFF]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL:%.*]] = call float @llvm.amdgcn.raw.ptr.buffer.load.f32(ptr addrspace(8) align 4 [[PTR_PREV_RSRC]], i32 [[PTR_PREV_OFF]], i32 0, i32 0)
; CHECK-NEXT:    [[SUM]] = fadd float [[SUM_PREV]], [[VAL]]
; CHECK-NEXT:    [[PTR_PREV_INT_RSRC:%.*]] = ptrtoint ptr addrspace(8) [[PTR_PREV_RSRC]] to i160
; CHECK-NEXT:    [[TMP0:%.*]] = shl nuw i160 [[PTR_PREV_INT_RSRC]], 32
; CHECK-NEXT:    [[PTR_PREV_INT_OFF:%.*]] = zext i32 [[PTR_PREV_OFF]] to i160
; CHECK-NEXT:    [[PTR_PREV_INT:%.*]] = or i160 [[TMP0]], [[PTR_PREV_INT_OFF]]
; CHECK-NEXT:    [[PTR_INT:%.*]] = add i160 [[PTR_PREV_INT]], 4
; CHECK-NEXT:    [[TMP1:%.*]] = lshr i160 [[PTR_INT]], 32
; CHECK-NEXT:    [[TMP2:%.*]] = trunc i160 [[TMP1]] to i128
; CHECK-NEXT:    [[PTR_RSRC]] = inttoptr i128 [[TMP2]] to ptr addrspace(8)
; CHECK-NEXT:    [[PTR_OFF]] = trunc i160 [[PTR_INT]] to i32
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[TEST:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
; CHECK-NEXT:    [[TEST_EXT:%.*]] = zext i1 [[TEST]] to i32
; CHECK-NEXT:    switch i32 [[TEST_EXT]], label [[LOOP]] [
; CHECK-NEXT:      i32 1, label [[LOOP]]
; CHECK-NEXT:      i32 0, label [[EXIT:%.*]]
; CHECK-NEXT:    ]
; CHECK:       exit:
; CHECK-NEXT:    ret float [[SUM]]
;
entry:
  %start = addrspacecast ptr addrspace(8) %buf to ptr addrspace(7)
  br label %loop
loop:
  %sum.prev = phi float [ %sum, %loop ], [ %sum, %loop ], [ 0.0, %entry ]
  %ptr.prev = phi ptr addrspace(7) [ %ptr, %loop ], [ %start, %entry ], [ %ptr, %loop ]
  %i = phi i32 [ %i.next, %loop ], [ 0, %entry ], [ %i.next, %loop ]

  %val = load float, ptr addrspace(7) %ptr.prev
  %sum = fadd float %sum.prev, %val

  %ptr.prev.int = ptrtoint ptr addrspace(7) %ptr.prev to i160
  %ptr.int = add i160 %ptr.prev.int, 4
  %ptr = inttoptr i160 %ptr.int to ptr addrspace(7)
  %i.next = add i32 %i, 1
  %test = icmp ult i32 %i.next, %len
  %test.ext = zext i1 %test to i32
  switch i32 %test.ext, label %loop [
  i32 1, label %loop
  i32 0, label %exit
  ]
exit:
  ret float %sum
}