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| ; RUN: opt %loadPolly -polly-opt-isl -polly-ast -polly-tiling=0 -polly-parallel -polly-opt-outer-coincidence=no -analyze < %s | FileCheck %s
; RUN: opt %loadPolly -polly-opt-isl -polly-ast -polly-tiling=0 -polly-parallel -polly-opt-outer-coincidence=yes -analyze < %s | FileCheck %s --check-prefix=OUTER
; By skewing, the diagonal can be made parallel. ISL does this when the Check
; the 'outer_coincidence' option is enabled.
;
; void func(int m, int n, float A[static const restrict m][n]) {
; for (int i = 1; i < m; i+=1)
; for (int j = 1; j < n; j+=1)
; A[i][j] = A[i-1][j] + A[i][j-1];
;}
define void @func(i64 %m, i64 %n, float* noalias nonnull %A) #0 {
entry:
br label %for.cond
for.cond: ; preds = %for.inc11, %entry
%i.0 = phi i64 [ 1, %entry ], [ %add12, %for.inc11 ]
%cmp = icmp slt i64 %i.0, %m
br i1 %cmp, label %for.cond1.preheader, label %for.end13
for.cond1.preheader: ; preds = %for.cond
br label %for.cond1
for.cond1: ; preds = %for.cond1.preheader, %for.body3
%j.0 = phi i64 [ %add10, %for.body3 ], [ 1, %for.cond1.preheader ]
%cmp2 = icmp slt i64 %j.0, %n
br i1 %cmp2, label %for.body3, label %for.inc11
for.body3: ; preds = %for.cond1
%sub = add nsw i64 %i.0, -1
%tmp = mul nsw i64 %sub, %n
%arrayidx = getelementptr inbounds float, float* %A, i64 %tmp
%arrayidx4 = getelementptr inbounds float, float* %arrayidx, i64 %j.0
%tmp13 = load float, float* %arrayidx4, align 4
%sub5 = add nsw i64 %j.0, -1
%tmp14 = mul nsw i64 %i.0, %n
%arrayidx6 = getelementptr inbounds float, float* %A, i64 %tmp14
%arrayidx7 = getelementptr inbounds float, float* %arrayidx6, i64 %sub5
%tmp15 = load float, float* %arrayidx7, align 4
%add = fadd float %tmp13, %tmp15
%tmp16 = mul nsw i64 %i.0, %n
%arrayidx8 = getelementptr inbounds float, float* %A, i64 %tmp16
%arrayidx9 = getelementptr inbounds float, float* %arrayidx8, i64 %j.0
store float %add, float* %arrayidx9, align 4
%add10 = add nuw nsw i64 %j.0, 1
br label %for.cond1
for.inc11: ; preds = %for.cond1
%add12 = add nuw nsw i64 %i.0, 1
br label %for.cond
for.end13: ; preds = %for.cond
ret void
}
; CHECK: #pragma minimal dependence distance: 1
; CHECK-NEXT: for (int c0 = 0; c0 < m - 1; c0 += 1)
; CHECK-NEXT: #pragma minimal dependence distance: 1
; CHECK-NEXT: for (int c1 = 0; c1 < n - 1; c1 += 1)
; CHECK-NEXT: Stmt_for_body3(c0, c1);
; OUTER: #pragma minimal dependence distance: 1
; OUTER-NEXT: for (int c0 = 0; c0 < m + n - 3; c0 += 1)
; OUTER-NEXT: #pragma simd
; OUTER-NEXT: #pragma known-parallel
; OUTER-NEXT: for (int c1 = max(0, -n + c0 + 2); c1 <= min(m - 2, c0); c1 += 1)
; OUTER-NEXT: Stmt_for_body3(c1, c0 - c1);
|