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! RUN: bbc -emit-fir -hlfir=false -o - %s | FileCheck %s
! RUN: %flang_fc1 -emit-fir -flang-deprecated-no-hlfir -o - %s | FileCheck %s
! RUN: %flang_fc1 -emit-fir -flang-deprecated-no-hlfir -flang-experimental-integer-overflow -o - %s | FileCheck %s --check-prefix=NSW
! Tests for infinite loop.
subroutine empty_infinite()
do
end do
end subroutine
! CHECK-LABEL: empty_infinite
! CHECK: cf.br ^[[BODY:.*]]
! CHECK: ^[[BODY]]:
! CHECK: cf.br ^[[BODY]]
subroutine simple_infinite(i)
integer :: i
do
if (i .gt. 100) exit
end do
end subroutine
! CHECK-LABEL: simple_infinite
! CHECK-SAME: %[[I_REF:.*]]: !fir.ref<i32>
! CHECK: cf.br ^[[BODY1:.*]]
! CHECK: ^[[BODY1]]:
! CHECK: %[[I:.*]] = fir.load %[[I_REF]] : !fir.ref<i32>
! CHECK: %[[C100:.*]] = arith.constant 100 : i32
! CHECK: %[[COND:.*]] = arith.cmpi sgt, %[[I]], %[[C100]] : i32
! CHECK: cf.cond_br %[[COND]], ^[[EXIT:.*]], ^[[BODY1:.*]]
! CHECK: ^[[EXIT]]:
! CHECK: cf.br ^[[RETURN:.*]]
! CHECK: ^[[RETURN]]:
! CHECK: return
! CHECK: }
subroutine infinite_with_two_body_blocks(i)
integer :: i
do
i = i + 1
if (i .gt. 100) exit
i = i * 2
end do
end subroutine
! CHECK-LABEL: infinite_with_two_body_blocks
! CHECK-SAME: %[[I_REF:.*]]: !fir.ref<i32>
! CHECK: cf.br ^[[BODY1:.*]]
! CHECK: ^[[BODY1]]:
! CHECK: %[[I:.*]] = fir.load %[[I_REF]] : !fir.ref<i32>
! CHECK: %[[C1:.*]] = arith.constant 1 : i32
! CHECK: %[[I_NEXT:.*]] = arith.addi %[[I]], %[[C1]] : i32
! CHECK: fir.store %[[I_NEXT]] to %[[I_REF]] : !fir.ref<i32>
! CHECK: %[[I:.*]] = fir.load %[[I_REF]] : !fir.ref<i32>
! CHECK: %[[C100:.*]] = arith.constant 100 : i32
! CHECK: %[[COND:.*]] = arith.cmpi sgt, %[[I]], %[[C100]] : i32
! CHECK: cf.cond_br %[[COND]], ^[[EXIT:.*]], ^[[BODY2:.*]]
! CHECK: ^[[EXIT]]:
! CHECK: cf.br ^[[RETURN:.*]]
! CHECK: ^[[BODY2]]:
! CHECK: %[[C2:.*]] = arith.constant 2 : i32
! CHECK: %[[I:.*]] = fir.load %[[I_REF]] : !fir.ref<i32>
! CHECK: %[[I_NEXT:.*]] = arith.muli %[[C2]], %[[I]] : i32
! CHECK: fir.store %[[I_NEXT]] to %[[I_REF]] : !fir.ref<i32>
! CHECK: cf.br ^[[BODY1]]
! CHECK: ^[[RETURN]]:
! CHECK: return
! CHECK: }
subroutine structured_loop_in_infinite(i)
integer :: i
integer :: j
do
if (i .gt. 100) exit
do j=1,10
end do
end do
end subroutine
! CHECK-LABEL: structured_loop_in_infinite
! CHECK-SAME: %[[I_REF:.*]]: !fir.ref<i32>
! CHECK: %[[J_REF:.*]] = fir.alloca i32 {bindc_name = "j", uniq_name = "_QFstructured_loop_in_infiniteEj"}
! CHECK: cf.br ^[[BODY1:.*]]
! CHECK: ^[[BODY1]]:
! CHECK: %[[I:.*]] = fir.load %[[I_REF]] : !fir.ref<i32>
! CHECK: %[[C100:.*]] = arith.constant 100 : i32
! CHECK: %[[COND:.*]] = arith.cmpi sgt, %[[I]], %[[C100]] : i32
! CHECK: cf.cond_br %[[COND]], ^[[EXIT:.*]], ^[[BODY2:.*]]
! CHECK: ^[[EXIT]]:
! CHECK: cf.br ^[[RETURN:.*]]
! CHECK: ^[[BODY2:.*]]:
! CHECK: %[[C1:.*]] = arith.constant 1 : i32
! CHECK: %[[C1_INDEX:.*]] = fir.convert %[[C1]] : (i32) -> index
! CHECK: %[[C10:.*]] = arith.constant 10 : i32
! CHECK: %[[C10_INDEX:.*]] = fir.convert %[[C10]] : (i32) -> index
! CHECK: %[[C1_1:.*]] = arith.constant 1 : index
! CHECK: %[[J_LB:.*]] = fir.convert %[[C1_INDEX]] : (index) -> i32
! CHECK: %[[J_FINAL:.*]]:2 = fir.do_loop %[[J:[^ ]*]] =
! CHECK-SAME: %[[C1_INDEX]] to %[[C10_INDEX]] step %[[C1_1]]
! CHECK-SAME: iter_args(%[[J_IV:.*]] = %[[J_LB]]) -> (index, i32) {
! CHECK: fir.store %[[J_IV]] to %[[J_REF]] : !fir.ref<i32>
! CHECK: %[[J_NEXT:.*]] = arith.addi %[[J]], %[[C1_1]] : index
! CHECK: %[[J_STEPCAST:.*]] = fir.convert %[[C1_1]] : (index) -> i32
! CHECK: %[[J_IVLOAD:.*]] = fir.load %[[J_REF]] : !fir.ref<i32>
! CHECK: %[[J_IVINC:.*]] = arith.addi %[[J_IVLOAD]], %[[J_STEPCAST]] : i32
! CHECK: fir.result %[[J_NEXT]], %[[J_IVINC]] : index, i32
! CHECK: }
! CHECK: fir.store %[[J_FINAL]]#1 to %[[J_REF]] : !fir.ref<i32>
! CHECK: cf.br ^[[BODY1]]
! CHECK: ^[[RETURN]]:
! CHECK: return
! NSW-LABEL: structured_loop_in_infinite
! NSW-SAME: %[[I_REF:.*]]: !fir.ref<i32>
! NSW: %[[J_REF:.*]] = fir.alloca i32 {bindc_name = "j", uniq_name = "_QFstructured_loop_in_infiniteEj"}
! NSW: cf.br ^[[BODY1:.*]]
! NSW: ^[[BODY1]]:
! NSW: %[[I:.*]] = fir.load %[[I_REF]] : !fir.ref<i32>
! NSW: %[[C100:.*]] = arith.constant 100 : i32
! NSW: %[[COND:.*]] = arith.cmpi sgt, %[[I]], %[[C100]] : i32
! NSW: cf.cond_br %[[COND]], ^[[EXIT:.*]], ^[[BODY2:.*]]
! NSW: ^[[EXIT]]:
! NSW: cf.br ^[[RETURN:.*]]
! NSW: ^[[BODY2:.*]]:
! NSW: %[[C1:.*]] = arith.constant 1 : i32
! NSW: %[[C1_INDEX:.*]] = fir.convert %[[C1]] : (i32) -> index
! NSW: %[[C10:.*]] = arith.constant 10 : i32
! NSW: %[[C10_INDEX:.*]] = fir.convert %[[C10]] : (i32) -> index
! NSW: %[[C1_1:.*]] = arith.constant 1 : index
! NSW: %[[J_LB:.*]] = fir.convert %[[C1_INDEX]] : (index) -> i32
! NSW: %[[J_FINAL:.*]]:2 = fir.do_loop %[[J:[^ ]*]] =
! NSW-SAME: %[[C1_INDEX]] to %[[C10_INDEX]] step %[[C1_1]]
! NSW-SAME: iter_args(%[[J_IV:.*]] = %[[J_LB]]) -> (index, i32) {
! NSW: fir.store %[[J_IV]] to %[[J_REF]] : !fir.ref<i32>
! NSW: %[[J_NEXT:.*]] = arith.addi %[[J]], %[[C1_1]] overflow<nsw> : index
! NSW: %[[J_STEPCAST:.*]] = fir.convert %[[C1_1]] : (index) -> i32
! NSW: %[[J_IVLOAD:.*]] = fir.load %[[J_REF]] : !fir.ref<i32>
! NSW: %[[J_IVINC:.*]] = arith.addi %[[J_IVLOAD]], %[[J_STEPCAST]] overflow<nsw> : i32
! NSW: fir.result %[[J_NEXT]], %[[J_IVINC]] : index, i32
! NSW: }
! NSW: fir.store %[[J_FINAL]]#1 to %[[J_REF]] : !fir.ref<i32>
! NSW: cf.br ^[[BODY1]]
! NSW: ^[[RETURN]]:
! NSW: return
subroutine empty_infinite_in_while(i)
integer :: i
do while (i .gt. 50)
do
end do
end do
end subroutine
! CHECK-LABEL: empty_infinite_in_while
! CHECK-SAME: %[[I_REF:.*]]: !fir.ref<i32>
! CHECK: cf.br ^bb1
! CHECK: ^bb1:
! CHECK: %[[I:.*]] = fir.load %[[I_REF]] : !fir.ref<i32>
! CHECK: %[[C50:.*]] = arith.constant 50 : i32
! CHECK: %[[COND:.*]] = arith.cmpi sgt, %[[I]], %[[C50]] : i32
! CHECK: cf.cond_br %[[COND]], ^[[INF_HEADER:.*]], ^[[EXIT:.*]]
! CHECK: ^[[INF_HEADER]]:
! CHECK: cf.br ^[[INF_BODY:.*]]
! CHECK: ^[[INF_BODY]]:
! CHECK: cf.br ^[[INF_HEADER]]
! CHECK: ^[[EXIT]]:
! CHECK: return
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