reduction_looprotate_loopguard_gvnpre.ll
3.85 KB
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; RUN: opt %loadPolly -polly-stmt-granularity=bb -polly-delicm -analyze < %s | FileCheck %s -match-full-lines
;
; Reduction over parametric number of elements and a loopguard if the
; reduction loop is not executed at all. Load hoisted before loop.
;
; void func(double *A) {
; for (int j = 0; j < 2; j += 1) { /* outer */
; double phi = 0.0;
; for (int i = 0; i < n; i += 1) { /* reduction */
; phi += 4.2;
; A[j] = phi;
; }
; }
; }
;
define void @func(i32 %n, double* noalias nonnull %A) {
entry:
br label %outer.preheader
outer.preheader:
br label %outer.for
outer.for:
%j = phi i32 [0, %outer.preheader], [%j.inc, %outer.inc]
%j.cmp = icmp slt i32 %j, 2
br i1 %j.cmp, label %reduction.preheader, label %outer.exit
reduction.preheader:
%guard.cmp = icmp sle i32 %n,0
br i1 %guard.cmp, label %reduction.exit, label %reduction.for
reduction.for:
%i = phi i32 [0, %reduction.preheader], [%i.inc, %reduction.inc]
%phi = phi double [0.0, %reduction.preheader], [%add, %reduction.inc]
br label %body
body:
%add = fadd double %phi, 4.2
%A_idx = getelementptr inbounds double, double* %A, i32 %j
store double %add, double* %A_idx
br label %reduction.inc
reduction.inc:
%i.inc = add nuw nsw i32 %i, 1
%i.cmp = icmp slt i32 %i.inc, %n
br i1 %i.cmp, label %reduction.for, label %reduction.exit
reduction.exit:
br label %outer.inc
outer.inc:
%j.inc = add nuw nsw i32 %j, 1
br label %outer.for
outer.exit:
br label %return
return:
ret void
}
; CHECK: Statistics {
; CHECK: Compatible overwrites: 1
; CHECK: Overwrites mapped to: 1
; CHECK: Value scalars mapped: 2
; CHECK: PHI scalars mapped: 1
; CHECK: }
; CHECK: After accesses {
; CHECK-NEXT: Stmt_reduction_preheader
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_reduction_preheader[i0] -> MemRef_phi__phi[] };
; CHECK-NEXT: new: [n] -> { Stmt_reduction_preheader[i0] -> MemRef_A[i0] : n > 0 };
; CHECK-NEXT: Stmt_reduction_for
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_reduction_for[i0, i1] -> MemRef_phi__phi[] };
; CHECK-NEXT: new: [n] -> { Stmt_reduction_for[i0, i1] -> MemRef_A[i0] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_reduction_for[i0, i1] -> MemRef_phi[] };
; CHECK-NEXT: new: [n] -> { Stmt_reduction_for[i0, i1] -> MemRef_A[i0] };
; CHECK-NEXT: Stmt_body
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_body[i0, i1] -> MemRef_add[] };
; CHECK-NEXT: new: [n] -> { Stmt_body[i0, i1] -> MemRef_A[i0] };
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_body[i0, i1] -> MemRef_phi[] };
; CHECK-NEXT: new: [n] -> { Stmt_body[i0, i1] -> MemRef_A[i0] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [n] -> { Stmt_body[i0, i1] -> MemRef_A[i0] };
; CHECK-NEXT: Stmt_reduction_inc
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_reduction_inc[i0, i1] -> MemRef_add[] };
; CHECK-NEXT: new: [n] -> { Stmt_reduction_inc[i0, i1] -> MemRef_A[i0] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_reduction_inc[i0, i1] -> MemRef_phi__phi[] };
; CHECK-NEXT: new: [n] -> { Stmt_reduction_inc[i0, i1] -> MemRef_A[i0] : i1 <= -2 + n };
; CHECK-NEXT: }