final/test/GPGPU/invariant-load-hoisting-with-failing-scop.ll

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

; RUN: opt %loadPolly -S -polly-use-llvm-names -polly-codegen-ppcg \
; RUN: -polly-invariant-load-hoisting < %s | FileCheck %s -check-prefix=HOST-IR

; REQUIRES: pollyacc

; SCOP:      Function: f
; SCOP-NEXT: Region: %entry.split---%for.end
; SCOP-NEXT: Max Loop Depth:  1
; SCOP-NEXT: Invariant Accesses: {
; SCOP-NEXT:         ReadAccess :=	[Reduction Type: NONE] [Scalar: 0]
; SCOP-NEXT:             [tmp, tmp1] -> { Stmt_if_end[i0] -> MemRef_end[0] };
; SCOP-NEXT:         Execution Context: [tmp, tmp1] -> {  :  }
; SCOP-NEXT:         ReadAccess :=	[Reduction Type: NONE] [Scalar: 0]
; SCOP-NEXT:             [tmp, tmp1] -> { Stmt_for_body[i0] -> MemRef_control[0] };
; SCOP-NEXT:         Execution Context: [tmp, tmp1] -> {  : tmp > 0 }
; SCOP-NEXT: }

; Check that we generate a correct "always false" branch.
; HOST-IR:  br i1 false, label %polly.start, label %entry.split.pre_entry_bb

; This test case checks that we generate correct code if PPCGCodeGeneration
; decides a build is unsuccessful with invariant load hoisting enabled.
;
; There is a conditional branch which switches between the original code and
; the new code. We try to set this conditional branch to branch on false.
; However, invariant load hoisting changes the structure of the scop, so we
; need to change the way we *locate* this instruction.
;
;    void f(const int *end, int *arr, const int *control, const int *readarr) {
;      for (int i = 0; i < *end; i++) {
;        int t = 0;
;        if (*control > 3) {
;          t += readarr[i];
;        }
;        arr[i] = t;
;      }
;    }
;

target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
target triple = "i386-apple-macosx10.12.0"

define void @f(i32* %end, i32* %arr, i32* %control, i32* %readarr) {
entry:
  br label %entry.split

entry.split:                                      ; preds = %entry
  %tmp3 = load i32, i32* %end, align 4
  %cmp4 = icmp sgt i32 %tmp3, 0
  br i1 %cmp4, label %for.body.lr.ph, label %for.end

for.body.lr.ph:                                   ; preds = %entry.split
  br label %for.body

for.body:                                         ; preds = %for.body.lr.ph, %if.end
  %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %if.end ]
  %tmp1 = load i32, i32* %control, align 4
  %cmp1 = icmp sgt i32 %tmp1, 3
  br i1 %cmp1, label %if.then, label %if.end

if.then:                                          ; preds = %for.body
  %arrayidx = getelementptr inbounds i32, i32* %readarr, i32 %i.05
  %tmp2 = load i32, i32* %arrayidx, align 4
  br label %if.end

if.end:                                           ; preds = %if.then, %for.body
  %t.0 = phi i32 [ %tmp2, %if.then ], [ 0, %for.body ]
  %arrayidx2 = getelementptr inbounds i32, i32* %arr, i32 %i.05
  store i32 %t.0, i32* %arrayidx2, align 4
  %inc = add nuw nsw i32 %i.05, 1
  %tmp = load i32, i32* %end, align 4
  %cmp = icmp slt i32 %inc, %tmp
  br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge

for.cond.for.end_crit_edge:                       ; preds = %if.end
  br label %for.end

for.end:                                          ; preds = %for.cond.for.end_crit_edge, %entry.split
  ret void
}