test/GPGPU/check-unused-fortran-array-size-param-offloaded-to-kernel.ll

; RUN: opt %loadPolly -analyze -polly-scops \
; RUN:     -polly-detect-fortran-arrays \
; RUN:     -polly-invariant-load-hoisting \
; RUN:     -polly-use-llvm-names \
; RUN:     -polly-stmt-granularity=bb \
; RUN:     < %s | FileCheck %s --check-prefix=SCOP

; RUN: opt %loadPolly -S \
; RUN:     -polly-detect-fortran-arrays \
; RUN:     -polly-codegen-ppcg \
; RUN:     -polly-invariant-load-hoisting \
; RUN:     -polly-use-llvm-names \
; RUN:     -polly-acc-fail-on-verify-module-failure \
; RUN:     < %s | FileCheck %s --check-prefix=HOST-IR

; REQUIRES: pollyacc

; In Polly, we specifically add a parameter to represent the outermost dimension
; size of fortran arrays. We do this because this information is statically
; available from the fortran metadata generated by dragonegg.
; However, we were only materializing these parameters (meaning, creating an
; llvm::Value to back the isl_id) from *memory accesses*. This is wrong,
; we should materialize parameters from *scop array info*.

; It is wrong because if there is a case where we detect 2 fortran arrays,
; but only one of them is accessed, we may not materialize the other array's
; dimensions at all.

; This test case checks that we do not fail if there is an array that does
; not have an access (In this case, `memory`), we still generate the
; parameter.

; Check that we detect the function as a Scop.
; SCOP:      Function: f
; SCOP-NEXT: Region: %loop.prepare---%for.exit
; SCOP-NEXT: Max Loop Depth:  1

; Check that we detect fortran arrays.
; SCOP:    Arrays (Bounds as pw_affs) {
; SCOP:             double* MemRef_global_arr[*]; // Element size 8
; SCOP-NEXT:        double MemRef_memory[ [MemRef_memory_fortranarr_size] -> { [] -> [(MemRef_memory_fortranarr_size)] } ]; [BasePtrOrigin: MemRef_global_arr] // Element size 8
; SCOP-NEXT:        double MemRef_memory2[ [MemRef_memory2_fortranarr_size] -> { [] -> [(MemRef_memory2_fortranarr_size)] } ]; [BasePtrOrigin: MemRef_global_arr] // Element size 8
; SCOP-NEXT:    }

; Check that we have writes *only* into memory2, not into memory.
; SCOP:    Statements {
; SCOP:    	Stmt_for_body
; SCOP:            MustWriteAccess :=	[Reduction Type: NONE] [Fortran array descriptor: global_arr] [Scalar: 0]
; SCOP-NEXT:                [start_val, end_val, offset, MemRef_memory_fortranarr_size, MemRef_memory2_fortranarr_size] -> { Stmt_for_body[i0] -> MemRef_memory2[start_val + offset + i0] };
; SCOP-NEXT:            ReadAccess :=	[Reduction Type: NONE] [Fortran array descriptor: global_arr] [Scalar: 0]
; SCOP-NEXT:                [start_val, end_val, offset, MemRef_memory_fortranarr_size, MemRef_memory2_fortranarr_size] -> { Stmt_for_body[i0] -> MemRef_memory2[start_val + offset + i0] };
; SCOP-NEXT:    }

; Check that we materialize the sizes and send it across to the kernel.
; HOST-IR: store i64 %MemRef_memory_size, i64* %polly_launch_0_param_4
; HOST-IR: store i64 %MemRef_memory2_size, i64* %polly_launch_0_param_5
target datalayout = "e-p:64:64:64-S128-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:128:128-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"

module asm "\09.ident\09\22GCC: (GNU) 4.6.4 LLVM: 3.3.1\22"

%"struct.array1_real(kind=8)" = type { i8*, i64, i64, [1 x %struct.descriptor_dimension] }
%struct.descriptor_dimension = type { i64, i64, i64 }

@global_arr = external unnamed_addr global %"struct.array1_real(kind=8)", align 32

; Function Attrs: nounwind uwtable
define void @f(i32* noalias %ipstart, i32* noalias %ipend) unnamed_addr #0 {
entry:
  br label %loop.prepare


loop.prepare:                                              ; preds = %"6", %"3.preheader"
  %start.val = load i32, i32* %ipstart, align 4
  %end.val = load i32, i32* %ipend, align 4
  %should.loop = icmp sgt i32 %start.val, %end.val
  br i1 %should.loop, label %for.exit, label %for.body


for.body:                                              ; preds = %for.body, %"4.preheader"
  %i = phi i32 [ %i.next, %for.body ], [ %start.val, %loop.prepare ]
  %i.sext = sext i32 %i to i64
  %memory = load double*, double** bitcast (%"struct.array1_real(kind=8)"* @global_arr to double**), align 32
  %offset = load i64, i64* getelementptr inbounds (%"struct.array1_real(kind=8)", %"struct.array1_real(kind=8)"* @global_arr, i64 0, i32 1), align 8
  %idx = add i64 %offset, %i.sext
  %slot = getelementptr double, double* %memory, i64 %idx
  store double 1.0, double* %slot, align 8

  %memory2 = load double*, double** bitcast (%"struct.array1_real(kind=8)"* @global_arr to double**), align 32
  %offset2 = load i64, i64* getelementptr inbounds (%"struct.array1_real(kind=8)", %"struct.array1_real(kind=8)"* @global_arr, i64 0, i32 1), align 8
  %idx2 = add i64 %offset2, %i.sext
  %slot2 = getelementptr double, double* %memory2, i64 %idx2
  %val = load double, double* %slot2, align 8

  %should.loopexit = icmp eq i32 %i, %end.val
  %i.next = add i32 %i, 1
  br i1 %should.loopexit, label %for.exit, label %for.body

for.exit:                                     ; preds = %for.body
  ret void
}

attributes #0 = { nounwind uwtable }