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Reroll loops with multiple IV and negative step part 3
support multiple induction variables This patch enable loop reroll for the following case: for(int i=0; i<N; i += 2) { S += *a++; S += *a++; }; Differential Revision: http://reviews.llvm.org/D16550 llvm-svn: 268147
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Lawrence Hu
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Apr 30, 2016
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; RUN: opt -S -loop-reroll %s | FileCheck %s | ||
declare i32 @goo(i32, i32) | ||
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@buf = external global i8* | ||
@aaa = global [16 x i8] c"\01\02\03\04\05\06\07\08\09\0A\0B\0C\0D\0E\0F\10", align 1 | ||
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define i32 @test1(i32 %len) { | ||
entry: | ||
br label %while.body | ||
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while.body: | ||
;CHECK-LABEL: while.body: | ||
;CHECK-NEXT: %indvar = phi i32 [ %indvar.next, %while.body ], [ 0, %entry ] | ||
;CHECK-NEXT: %buf.021 = phi i8* [ getelementptr inbounds ([16 x i8], [16 x i8]* @aaa, i64 0, i64 0), %entry ], [ %add.ptr, %while.body ] | ||
;CHECK-NEXT: %sum44.020 = phi i64 [ 0, %entry ], [ %add, %while.body ] | ||
;CHECK-NEXT: [[T2:%[0-9]+]] = load i8, i8* %buf.021, align 1 | ||
;CHECK-NEXT: %conv = zext i8 [[T2]] to i64 | ||
;CHECK-NEXT: %add = add i64 %conv, %sum44.020 | ||
;CHECK-NEXT: %add.ptr = getelementptr inbounds i8, i8* %buf.021, i64 1 | ||
;CHECK-NEXT: %indvar.next = add i32 %indvar, 1 | ||
;CHECK-NEXT: %exitcond = icmp eq i32 %indvar, 1 | ||
;CHECK-NEXT: br i1 %exitcond, label %while.end, label %while.body | ||
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%dec22 = phi i32 [ 4, %entry ], [ %dec, %while.body ] | ||
%buf.021 = phi i8* [ getelementptr inbounds ([16 x i8], [16 x i8]* @aaa, i64 0, i64 0), %entry ], [ %add.ptr, %while.body ] | ||
%sum44.020 = phi i64 [ 0, %entry ], [ %add9, %while.body ] | ||
%0 = load i8, i8* %buf.021, align 1 | ||
%conv = zext i8 %0 to i64 | ||
%add = add i64 %conv, %sum44.020 | ||
%arrayidx1 = getelementptr inbounds i8, i8* %buf.021, i64 1 | ||
%1 = load i8, i8* %arrayidx1, align 1 | ||
%conv2 = zext i8 %1 to i64 | ||
%add3 = add i64 %add, %conv2 | ||
%arrayidx4 = getelementptr inbounds i8, i8* %buf.021, i64 2 | ||
%2 = load i8, i8* %arrayidx4, align 1 | ||
%conv5 = zext i8 %2 to i64 | ||
%add6 = add i64 %add3, %conv5 | ||
%arrayidx7 = getelementptr inbounds i8, i8* %buf.021, i64 3 | ||
%3 = load i8, i8* %arrayidx7, align 1 | ||
%conv8 = zext i8 %3 to i64 | ||
%add9 = add i64 %add6, %conv8 | ||
%add.ptr = getelementptr inbounds i8, i8* %buf.021, i64 4 | ||
%dec = add nsw i32 %dec22, -1 | ||
%tobool = icmp eq i32 %dec, 0 | ||
br i1 %tobool, label %while.end, label %while.body | ||
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while.end: ; preds = %while.body | ||
%conv11 = trunc i64 %add9 to i32 | ||
%call = tail call i32 @goo(i32 0, i32 %conv11) | ||
unreachable | ||
} | ||
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define i32 @test2(i32 %N, i32* nocapture readonly %a, i32 %S) { | ||
entry: | ||
%cmp.9 = icmp sgt i32 %N, 0 | ||
br i1 %cmp.9, label %for.body.lr.ph, label %for.cond.cleanup | ||
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for.body.lr.ph: | ||
br label %for.body | ||
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for.cond.for.cond.cleanup_crit_edge: | ||
br label %for.cond.cleanup | ||
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for.cond.cleanup: | ||
%S.addr.0.lcssa = phi i32 [ %add2, %for.cond.for.cond.cleanup_crit_edge ], [ %S, %entry ] | ||
ret i32 %S.addr.0.lcssa | ||
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for.body: | ||
;CHECK-LABEL: for.body: | ||
;CHECK-NEXT: %indvar = phi i32 [ %indvar.next, %for.body ], [ 0, %for.body.lr.ph ] | ||
;CHECK-NEXT: %S.addr.011 = phi i32 [ %S, %for.body.lr.ph ], [ %add, %for.body ] | ||
;CHECK-NEXT: %a.addr.010 = phi i32* [ %a, %for.body.lr.ph ], [ %incdec.ptr1, %for.body ] | ||
;CHECK-NEXT: %4 = load i32, i32* %a.addr.010, align 4 | ||
;CHECK-NEXT: %add = add nsw i32 %4, %S.addr.011 | ||
;CHECK-NEXT: %incdec.ptr1 = getelementptr inbounds i32, i32* %a.addr.010, i64 1 | ||
;CHECK-NEXT: %indvar.next = add i32 %indvar, 1 | ||
;CHECK-NEXT: %exitcond = icmp eq i32 %indvar, %3 | ||
;CHECK-NEXT: br i1 %exitcond, label %for.cond.for.cond.cleanup_crit_edge, label %for.body | ||
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%i.012 = phi i32 [ 0, %for.body.lr.ph ], [ %add3, %for.body ] | ||
%S.addr.011 = phi i32 [ %S, %for.body.lr.ph ], [ %add2, %for.body ] | ||
%a.addr.010 = phi i32* [ %a, %for.body.lr.ph ], [ %incdec.ptr1, %for.body ] | ||
%incdec.ptr = getelementptr inbounds i32, i32* %a.addr.010, i64 1 | ||
%0 = load i32, i32* %a.addr.010, align 4 | ||
%add = add nsw i32 %0, %S.addr.011 | ||
%incdec.ptr1 = getelementptr inbounds i32, i32* %a.addr.010, i64 2 | ||
%1 = load i32, i32* %incdec.ptr, align 4 | ||
%add2 = add nsw i32 %add, %1 | ||
%add3 = add nsw i32 %i.012, 2 | ||
%cmp = icmp slt i32 %add3, %N | ||
br i1 %cmp, label %for.body, label %for.cond.for.cond.cleanup_crit_edge | ||
} | ||
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define i32 @test3(i32* nocapture readonly %buf, i32 %len) #0 { | ||
entry: | ||
%cmp10 = icmp sgt i32 %len, 1 | ||
br i1 %cmp10, label %while.body.preheader, label %while.end | ||
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while.body.preheader: ; preds = %entry | ||
br label %while.body | ||
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while.body: ; preds = %while.body.preheader, %while.body | ||
;CHECK-LABEL: while.body: | ||
;CHECK-NEXT: %indvar = phi i32 [ %indvar.next, %while.body ], [ 0, %while.body.preheader ] | ||
;CHECK-NEXT: %S.012 = phi i32 [ %add, %while.body ], [ undef, %while.body.preheader ] | ||
;CHECK-NEXT: %buf.addr.011 = phi i32* [ %add.ptr, %while.body ], [ %buf, %while.body.preheader ] | ||
;CHECK-NEXT: %4 = load i32, i32* %buf.addr.011, align 4 | ||
;CHECK-NEXT: %add = add nsw i32 %4, %S.012 | ||
;CHECK-NEXT: %add.ptr = getelementptr inbounds i32, i32* %buf.addr.011, i64 -1 | ||
;CHECK-NEXT: %indvar.next = add i32 %indvar, 1 | ||
;CHECK-NEXT: %exitcond = icmp eq i32 %indvar, %3 | ||
;CHECK-NEXT: br i1 %exitcond, label %while.end.loopexit, label %while.body | ||
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%i.013 = phi i32 [ %sub, %while.body ], [ %len, %while.body.preheader ] | ||
%S.012 = phi i32 [ %add2, %while.body ], [ undef, %while.body.preheader ] | ||
%buf.addr.011 = phi i32* [ %add.ptr, %while.body ], [ %buf, %while.body.preheader ] | ||
%0 = load i32, i32* %buf.addr.011, align 4 | ||
%add = add nsw i32 %0, %S.012 | ||
%arrayidx1 = getelementptr inbounds i32, i32* %buf.addr.011, i64 -1 | ||
%1 = load i32, i32* %arrayidx1, align 4 | ||
%add2 = add nsw i32 %add, %1 | ||
%add.ptr = getelementptr inbounds i32, i32* %buf.addr.011, i64 -2 | ||
%sub = add nsw i32 %i.013, -2 | ||
%cmp = icmp sgt i32 %sub, 1 | ||
br i1 %cmp, label %while.body, label %while.end.loopexit | ||
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while.end.loopexit: ; preds = %while.body | ||
br label %while.end | ||
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while.end: ; preds = %while.end.loopexit, %entry | ||
%S.0.lcssa = phi i32 [ undef, %entry ], [ %add2, %while.end.loopexit ] | ||
ret i32 %S.0.lcssa | ||
} | ||
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