test/Transforms/LoopStrengthReduce/2011-10-06-ReusePhi.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt -loop-reduce -S < %s | FileCheck %s
;
; Test LSR's intelligence regarding phi reuse.
; Verify that scaled GEPs are not reused. rdar://5064068

target triple = "x86_64-apple-darwin"

; Provide legal integer types.
target datalayout = "n8:16:32:64"


define float @test(ptr nocapture %A, ptr nocapture %B, i32 %N, i32 %IA, i32 %IB) nounwind uwtable readonly ssp {
; CHECK-LABEL: define float @test
; CHECK-SAME: (ptr nocapture [[A:%.*]], ptr nocapture [[B:%.*]], i32 [[N:%.*]], i32 [[IA:%.*]], i32 [[IB:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i32 [[N]], 0
; CHECK-NEXT:    br i1 [[CMP1]], label [[WHILE_BODY_LR_PH:%.*]], label [[WHILE_END:%.*]]
; CHECK:       while.body.lr.ph:
; CHECK-NEXT:    [[IDX_EXT:%.*]] = sext i32 [[IA]] to i64
; CHECK-NEXT:    [[IDX_EXT2:%.*]] = sext i32 [[IB]] to i64
; CHECK-NEXT:    [[TMP0:%.*]] = shl nsw i64 [[IDX_EXT]], 2
; CHECK-NEXT:    [[TMP1:%.*]] = shl nsw i64 [[IDX_EXT2]], 2
; CHECK-NEXT:    br label [[WHILE_BODY:%.*]]
; CHECK:       while.body:
; CHECK-NEXT:    [[LSR_IV1:%.*]] = phi ptr [ [[SCEVGEP2:%.*]], [[WHILE_BODY]] ], [ [[B]], [[WHILE_BODY_LR_PH]] ]
; CHECK-NEXT:    [[LSR_IV:%.*]] = phi ptr [ [[SCEVGEP:%.*]], [[WHILE_BODY]] ], [ [[A]], [[WHILE_BODY_LR_PH]] ]
; CHECK-NEXT:    [[N_ADDR_03:%.*]] = phi i32 [ [[N]], [[WHILE_BODY_LR_PH]] ], [ [[SUB:%.*]], [[WHILE_BODY]] ]
; CHECK-NEXT:    [[SUM0_02:%.*]] = phi float [ 0.000000e+00, [[WHILE_BODY_LR_PH]] ], [ [[ADD:%.*]], [[WHILE_BODY]] ]
; CHECK-NEXT:    [[TMP2:%.*]] = load float, ptr [[LSR_IV]], align 4
; CHECK-NEXT:    [[TMP3:%.*]] = load float, ptr [[LSR_IV1]], align 4
; CHECK-NEXT:    [[MUL:%.*]] = fmul float [[TMP2]], [[TMP3]]
; CHECK-NEXT:    [[ADD]] = fadd float [[SUM0_02]], [[MUL]]
; CHECK-NEXT:    [[SUB]] = add nsw i32 [[N_ADDR_03]], -1
; CHECK-NEXT:    [[SCEVGEP]] = getelementptr i8, ptr [[LSR_IV]], i64 [[TMP0]]
; CHECK-NEXT:    [[SCEVGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i64 [[TMP1]]
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT:    br i1 [[CMP]], label [[WHILE_BODY]], label [[WHILE_END_LOOPEXIT:%.*]]
; CHECK:       while.end.loopexit:
; CHECK-NEXT:    br label [[WHILE_END]]
; CHECK:       while.end:
; CHECK-NEXT:    [[SUM0_0_LCSSA:%.*]] = phi float [ 0.000000e+00, [[ENTRY:%.*]] ], [ [[ADD]], [[WHILE_END_LOOPEXIT]] ]
; CHECK-NEXT:    ret float [[SUM0_0_LCSSA]]
;
entry:
  %cmp1 = icmp sgt i32 %N, 0
  br i1 %cmp1, label %while.body.lr.ph, label %while.end

while.body.lr.ph:                                 ; preds = %entry
  %idx.ext = sext i32 %IA to i64
  %idx.ext2 = sext i32 %IB to i64
  br label %while.body

while.body:                                       ; preds = %while.body.lr.ph, %while.body
  %A.addr.05 = phi ptr [ %A, %while.body.lr.ph ], [ %add.ptr, %while.body ]
  %B.addr.04 = phi ptr [ %B, %while.body.lr.ph ], [ %add.ptr3, %while.body ]
  %N.addr.03 = phi i32 [ %N, %while.body.lr.ph ], [ %sub, %while.body ]
  %Sum0.02 = phi float [ 0.000000e+00, %while.body.lr.ph ], [ %add, %while.body ]
  %0 = load float, ptr %A.addr.05, align 4
  %1 = load float, ptr %B.addr.04, align 4
  %mul = fmul float %0, %1
  %add = fadd float %Sum0.02, %mul
  %add.ptr = getelementptr inbounds float, ptr %A.addr.05, i64 %idx.ext
  %add.ptr3 = getelementptr inbounds float, ptr %B.addr.04, i64 %idx.ext2
  %sub = add nsw i32 %N.addr.03, -1
  %cmp = icmp sgt i32 %sub, 0
  br i1 %cmp, label %while.body, label %while.end

while.end:                                        ; preds = %while.body, %entry
  %Sum0.0.lcssa = phi float [ 0.000000e+00, %entry ], [ %add, %while.body ]
  ret float %Sum0.0.lcssa
}