llvm/test/Transforms/InferAlignment/gep-2d.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt < %s -passes=infer-alignment -S | FileCheck %s

; A multi-dimensional array in a nested loop.inner doing vector stores that
; aren't yet aligned. InferAlignment can understand the addressing in the
; Nice case to prove 16 byte alignment. In the Awkward case, the inner
; array dimension is not even, so the stores to it won't always be aligned.
;
; InferAlignment should prove alignment in exactly one of the two cases.

@Nice    = global [1001 x [20000 x double]] zeroinitializer, align 32
@Awkward = global [1001 x [20001 x double]] zeroinitializer, align 32

define void @nested_loop() {
; CHECK-LABEL: define void @nested_loop() {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_OUTER:%.*]]
; CHECK:       loop.outer:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[I_NEXT:%.*]], [[LOOP_OUTER_TAIL:%.*]] ]
; CHECK-NEXT:    br label [[LOOP_INNER:%.*]]
; CHECK:       loop.inner:
; CHECK-NEXT:    [[J:%.*]] = phi i64 [ 0, [[LOOP_OUTER]] ], [ [[J_NEXT:%.*]], [[LOOP_INNER_TAIL:%.*]] ]
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr [1001 x [20000 x double]], ptr @Nice, i64 0, i64 [[I]], i64 [[J]]
; CHECK-NEXT:    store <2 x double> zeroinitializer, ptr [[GEP_1]], align 16
; CHECK-NEXT:    [[LOAD_1:%.*]] = load <2 x double>, ptr [[GEP_1]], align 16
; CHECK-NEXT:    [[GEP_2:%.*]] = getelementptr [1001 x [20001 x double]], ptr @Awkward, i64 0, i64 [[I]], i64 [[J]]
; CHECK-NEXT:    store <2 x double> zeroinitializer, ptr [[GEP_2]], align 8
; CHECK-NEXT:    [[LOAD_2:%.*]] = load <2 x double>, ptr [[GEP_2]], align 8
; CHECK-NEXT:    br label [[LOOP_INNER_TAIL]]
; CHECK:       loop.inner.tail:
; CHECK-NEXT:    [[J_NEXT]] = add i64 [[J]], 2
; CHECK-NEXT:    [[J_CMP:%.*]] = icmp eq i64 [[J_NEXT]], 556
; CHECK-NEXT:    br i1 [[J_CMP]], label [[LOOP_OUTER_TAIL]], label [[LOOP_INNER]]
; CHECK:       loop.outer.tail:
; CHECK-NEXT:    [[I_NEXT]] = add i64 [[I]], 1
; CHECK-NEXT:    [[I_CMP:%.*]] = icmp eq i64 [[I_NEXT]], 991
; CHECK-NEXT:    br i1 [[I_CMP]], label [[RETURN:%.*]], label [[LOOP_OUTER]]
; CHECK:       return:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.outer

loop.outer:
  %i = phi i64 [ 0, %entry ], [ %i.next, %loop.outer.tail ]
  br label %loop.inner

loop.inner:
  %j = phi i64 [ 0, %loop.outer ], [ %j.next, %loop.inner.tail ]

  %gep.1 = getelementptr [1001 x [20000 x double]], ptr @Nice, i64 0, i64 %i, i64 %j
  store <2 x double><double 0.0, double 0.0>, ptr %gep.1, align 8
  %load.1 = load <2 x double>, ptr %gep.1, align 8

  %gep.2 = getelementptr [1001 x [20001 x double]], ptr @Awkward, i64 0, i64 %i, i64 %j
  store <2 x double><double 0.0, double 0.0>, ptr %gep.2, align 8
  %load.2 = load <2 x double>, ptr %gep.2, align 8

  br label %loop.inner.tail

loop.inner.tail:
  %j.next = add i64 %j, 2
  %j.cmp = icmp eq i64 %j.next, 556
  br i1 %j.cmp, label %loop.outer.tail, label %loop.inner

loop.outer.tail:
  %i.next = add i64 %i, 1
  %i.cmp = icmp eq i64 %i.next, 991
  br i1 %i.cmp, label %return, label %loop.outer

return:
  ret void
}