mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
7ab8b5573e
This patch enables interchanging of tightly nested loops with reductions. Differential Revision: http://reviews.llvm.org/D8314 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235571 91177308-0d34-0410-b5e6-96231b3b80d8
236 lines
11 KiB
LLVM
236 lines
11 KiB
LLVM
; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s
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@A = common global [500 x [500 x i32]] zeroinitializer
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@X = common global i32 0
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@B = common global [500 x [500 x i32]] zeroinitializer
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@Y = common global i32 0
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;; for( int i=1;i<N;i++)
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;; for( int j=1;j<N;j++)
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;; X+=A[j][i];
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define void @reduction_01(i32 %N) {
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entry:
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%cmp16 = icmp sgt i32 %N, 1
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br i1 %cmp16, label %for.body3.lr.ph, label %for.end8
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for.body3.lr.ph: ; preds = %entry, %for.cond1.for.inc6_crit_edge
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%indvars.iv18 = phi i64 [ %indvars.iv.next19, %for.cond1.for.inc6_crit_edge ], [ 1, %entry ]
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%X.promoted = load i32, i32* @X
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br label %for.body3
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for.body3: ; preds = %for.body3, %for.body3.lr.ph
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%indvars.iv = phi i64 [ 1, %for.body3.lr.ph ], [ %indvars.iv.next, %for.body3 ]
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%add15 = phi i32 [ %X.promoted, %for.body3.lr.ph ], [ %add, %for.body3 ]
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%arrayidx5 = getelementptr inbounds [500 x [500 x i32]], [500 x [500 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv18
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%0 = load i32, i32* %arrayidx5
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%add = add nsw i32 %add15, %0
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %N
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br i1 %exitcond, label %for.cond1.for.inc6_crit_edge, label %for.body3
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for.cond1.for.inc6_crit_edge: ; preds = %for.body3
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store i32 %add, i32* @X
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%indvars.iv.next19 = add nuw nsw i64 %indvars.iv18, 1
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%lftr.wideiv20 = trunc i64 %indvars.iv.next19 to i32
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%exitcond21 = icmp eq i32 %lftr.wideiv20, %N
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br i1 %exitcond21, label %for.end8, label %for.body3.lr.ph
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for.end8: ; preds = %for.cond1.for.inc6_crit_edge, %entry
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ret void
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}
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;; Loop is interchanged check that the phi nodes are split and the promoted value is used instead of the reduction phi.
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; CHECK-LABEL: @reduction_01
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; CHECK: for.body3: ; preds = %for.body3.preheader, %for.body3.split
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; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3.split ], [ 1, %for.body3.preheader ]
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; CHECK: br label %for.body3.lr.ph.preheader
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; CHECK: %add = add nsw i32 %X.promoted
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;; Test for more than 1 reductions inside a loop.
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;; for( int i=1;i<N;i++)
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;; for( int j=1;j<N;j++)
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;; for( int k=1;k<N;k++) {
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;; X+=A[k][j];
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;; Y+=B[k][i];
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;; }
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define void @reduction_02(i32 %N) {
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entry:
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%cmp34 = icmp sgt i32 %N, 1
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br i1 %cmp34, label %for.cond4.preheader.preheader, label %for.end19
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for.cond4.preheader.preheader: ; preds = %entry, %for.inc17
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%indvars.iv40 = phi i64 [ %indvars.iv.next41, %for.inc17 ], [ 1, %entry ]
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br label %for.body6.lr.ph
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for.body6.lr.ph: ; preds = %for.cond4.for.inc14_crit_edge, %for.cond4.preheader.preheader
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%indvars.iv36 = phi i64 [ %indvars.iv.next37, %for.cond4.for.inc14_crit_edge ], [ 1, %for.cond4.preheader.preheader ]
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%X.promoted = load i32, i32* @X
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%Y.promoted = load i32, i32* @Y
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br label %for.body6
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for.body6: ; preds = %for.body6, %for.body6.lr.ph
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%indvars.iv = phi i64 [ 1, %for.body6.lr.ph ], [ %indvars.iv.next, %for.body6 ]
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%add1331 = phi i32 [ %Y.promoted, %for.body6.lr.ph ], [ %add13, %for.body6 ]
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%add30 = phi i32 [ %X.promoted, %for.body6.lr.ph ], [ %add, %for.body6 ]
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%arrayidx8 = getelementptr inbounds [500 x [500 x i32]], [500 x [500 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv36
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%0 = load i32, i32* %arrayidx8
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%add = add nsw i32 %add30, %0
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%arrayidx12 = getelementptr inbounds [500 x [500 x i32]], [500 x [500 x i32]]* @B, i64 0, i64 %indvars.iv, i64 %indvars.iv40
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%1 = load i32, i32* %arrayidx12
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%add13 = add nsw i32 %add1331, %1
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %N
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br i1 %exitcond, label %for.cond4.for.inc14_crit_edge, label %for.body6
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for.cond4.for.inc14_crit_edge: ; preds = %for.body6
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store i32 %add, i32* @X
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store i32 %add13, i32* @Y
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%indvars.iv.next37 = add nuw nsw i64 %indvars.iv36, 1
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%lftr.wideiv38 = trunc i64 %indvars.iv.next37 to i32
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%exitcond39 = icmp eq i32 %lftr.wideiv38, %N
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br i1 %exitcond39, label %for.inc17, label %for.body6.lr.ph
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for.inc17: ; preds = %for.cond4.for.inc14_crit_edge
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%indvars.iv.next41 = add nuw nsw i64 %indvars.iv40, 1
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%lftr.wideiv42 = trunc i64 %indvars.iv.next41 to i32
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%exitcond43 = icmp eq i32 %lftr.wideiv42, %N
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br i1 %exitcond43, label %for.end19, label %for.cond4.preheader.preheader
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for.end19: ; preds = %for.inc17, %entry
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ret void
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}
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;; Loop is interchanged check that the phi nodes are split and the promoted value is used instead of the reduction phi.
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; CHECK-LABEL: @reduction_02
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; CHECK: for.body6: ; preds = %for.body6.preheader, %for.body6.split
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; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %for.body6.split ], [ 1, %for.body6.preheader ]
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; CHECK: br label %for.cond4.preheader.preheader.preheader
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; CHECK: %add13 = add nsw i32 %Y.promoted
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;; Not tightly nested. Do not interchange.
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;; for( int i=1;i<N;i++)
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;; for( int j=1;j<N;j++) {
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;; for( int k=1;k<N;k++) {
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;; X+=A[k][j];
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;; }
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;; Y+=B[j][i];
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;; }
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define void @reduction_03(i32 %N) {
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entry:
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%cmp35 = icmp sgt i32 %N, 1
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br i1 %cmp35, label %for.cond4.preheader.lr.ph, label %for.end19
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for.cond4.preheader.lr.ph: ; preds = %entry, %for.cond1.for.inc17_crit_edge
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%indvars.iv41 = phi i64 [ %indvars.iv.next42, %for.cond1.for.inc17_crit_edge ], [ 1, %entry ]
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%Y.promoted = load i32, i32* @Y
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br label %for.body6.lr.ph
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for.body6.lr.ph: ; preds = %for.cond4.preheader.lr.ph, %for.cond4.for.end_crit_edge
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%indvars.iv37 = phi i64 [ 1, %for.cond4.preheader.lr.ph ], [ %indvars.iv.next38, %for.cond4.for.end_crit_edge ]
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%add1334 = phi i32 [ %Y.promoted, %for.cond4.preheader.lr.ph ], [ %add13, %for.cond4.for.end_crit_edge ]
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%X.promoted = load i32, i32* @X
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br label %for.body6
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for.body6: ; preds = %for.body6, %for.body6.lr.ph
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%indvars.iv = phi i64 [ 1, %for.body6.lr.ph ], [ %indvars.iv.next, %for.body6 ]
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%add31 = phi i32 [ %X.promoted, %for.body6.lr.ph ], [ %add, %for.body6 ]
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%arrayidx8 = getelementptr inbounds [500 x [500 x i32]], [500 x [500 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv37
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%0 = load i32, i32* %arrayidx8
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%add = add nsw i32 %add31, %0
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %N
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br i1 %exitcond, label %for.cond4.for.end_crit_edge, label %for.body6
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for.cond4.for.end_crit_edge: ; preds = %for.body6
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store i32 %add, i32* @X
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%arrayidx12 = getelementptr inbounds [500 x [500 x i32]], [500 x [500 x i32]]* @B, i64 0, i64 %indvars.iv37, i64 %indvars.iv41
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%1 = load i32, i32* %arrayidx12
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%add13 = add nsw i32 %add1334, %1
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%indvars.iv.next38 = add nuw nsw i64 %indvars.iv37, 1
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%lftr.wideiv39 = trunc i64 %indvars.iv.next38 to i32
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%exitcond40 = icmp eq i32 %lftr.wideiv39, %N
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br i1 %exitcond40, label %for.cond1.for.inc17_crit_edge, label %for.body6.lr.ph
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for.cond1.for.inc17_crit_edge: ; preds = %for.cond4.for.end_crit_edge
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store i32 %add13, i32* @Y
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%indvars.iv.next42 = add nuw nsw i64 %indvars.iv41, 1
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%lftr.wideiv43 = trunc i64 %indvars.iv.next42 to i32
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%exitcond44 = icmp eq i32 %lftr.wideiv43, %N
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br i1 %exitcond44, label %for.end19, label %for.cond4.preheader.lr.ph
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for.end19: ; preds = %for.cond1.for.inc17_crit_edge, %entry
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ret void
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}
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;; Not tightly nested. Do not interchange.
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;; Not interchanged hence the phi's in the inner loop will not be split. Check for the same.
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; CHECK-LABEL: @reduction_03
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; CHECK: for.body6: ; preds = %for.body6.preheader, %for.body6
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; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %for.body6 ], [ 1, %for.body6.preheader ]
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; CHECK: %add31 = phi i32 [ %add, %for.body6 ], [ %X.promoted, %for.body6.preheader ]
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;; Multiple use of reduction not safe. Do not interchange.
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;; for( int i=1;i<N;i++)
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;; for( int j=1;j<N;j++)
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;; for( int k=1;k<N;k++) {
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;; X+=A[k][j];
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;; Y+=X;
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;; }
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define void @reduction_04(i32 %N) {
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entry:
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%cmp28 = icmp sgt i32 %N, 1
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br i1 %cmp28, label %for.cond4.preheader.preheader, label %for.end15
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for.cond4.preheader.preheader: ; preds = %entry, %for.inc13
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%i.029 = phi i32 [ %inc14, %for.inc13 ], [ 1, %entry ]
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br label %for.body6.lr.ph
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for.body6.lr.ph: ; preds = %for.cond4.for.inc10_crit_edge, %for.cond4.preheader.preheader
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%indvars.iv30 = phi i64 [ %indvars.iv.next31, %for.cond4.for.inc10_crit_edge ], [ 1, %for.cond4.preheader.preheader ]
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%X.promoted = load i32, i32* @X
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%Y.promoted = load i32, i32* @Y
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br label %for.body6
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for.body6: ; preds = %for.body6, %for.body6.lr.ph
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%indvars.iv = phi i64 [ 1, %for.body6.lr.ph ], [ %indvars.iv.next, %for.body6 ]
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%add925 = phi i32 [ %Y.promoted, %for.body6.lr.ph ], [ %add9, %for.body6 ]
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%add24 = phi i32 [ %X.promoted, %for.body6.lr.ph ], [ %add, %for.body6 ]
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%arrayidx8 = getelementptr inbounds [500 x [500 x i32]], [500 x [500 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv30
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%0 = load i32, i32* %arrayidx8
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%add = add nsw i32 %add24, %0
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%add9 = add nsw i32 %add925, %add
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %N
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br i1 %exitcond, label %for.cond4.for.inc10_crit_edge, label %for.body6
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for.cond4.for.inc10_crit_edge: ; preds = %for.body6
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store i32 %add, i32* @X
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store i32 %add9, i32* @Y
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%indvars.iv.next31 = add nuw nsw i64 %indvars.iv30, 1
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%lftr.wideiv32 = trunc i64 %indvars.iv.next31 to i32
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%exitcond33 = icmp eq i32 %lftr.wideiv32, %N
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br i1 %exitcond33, label %for.inc13, label %for.body6.lr.ph
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for.inc13: ; preds = %for.cond4.for.inc10_crit_edge
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%inc14 = add nuw nsw i32 %i.029, 1
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%exitcond34 = icmp eq i32 %inc14, %N
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br i1 %exitcond34, label %for.end15, label %for.cond4.preheader.preheader
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for.end15: ; preds = %for.inc13, %entry
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ret void
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}
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;; Not interchanged hence the phi's in the inner loop will not be split. Check for the same.
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; CHECK-LABEL: @reduction_04
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; CHECK: for.body6: ; preds = %for.body6.preheader, %for.body6
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; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %for.body6 ], [ 1, %for.body6.preheader ]
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; CHECK: %add925 = phi i32 [ %add9, %for.body6 ], [ %Y.promoted, %for.body6.preheader ]
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