llvm/test/Transforms/LoopVectorize/iv-select-cmp-fold-tail.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -p loop-vectorize -prefer-predicate-over-epilogue=predicate-dont-vectorize -force-vector-width=4 -S %s | FileCheck %s

define i32 @find_last_trunc_iv(ptr %src, i64 %n) {
; CHECK-LABEL: define i32 @find_last_trunc_iv(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[RDX:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[RDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP_SRC:%.*]] = getelementptr inbounds i32, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i32, ptr [[GEP_SRC]], align 4
; CHECK-NEXT:    [[CMP103:%.*]] = icmp eq i32 [[L]], 0
; CHECK-NEXT:    [[TMP0:%.*]] = trunc i64 [[IV]] to i32
; CHECK-NEXT:    [[RDX_NEXT]] = select i1 [[CMP103]], i32 [[TMP0]], i32 [[RDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[EC:%.*]] = icmp eq i64 [[IV]], [[N]]
; CHECK-NEXT:    br i1 [[EC]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RDX_NEXT_LCSSA:%.*]] = phi i32 [ [[RDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i32 [[RDX_NEXT_LCSSA]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %rdx = phi i32 [ 0, %entry ], [ %rdx.next, %loop ]
  %gep.src = getelementptr inbounds i32, ptr %src, i64 %iv
  %l = load i32, ptr %gep.src
  %cmp103 = icmp eq i32 %l, 0
  %0 = trunc i64 %iv to i32
  %rdx.next = select i1 %cmp103, i32 %0, i32 %rdx
  %iv.next = add i64 %iv, 1
  %ec = icmp eq i64 %iv, %n
  br i1 %ec, label %exit, label %loop

exit:
  ret i32 %rdx.next
}