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when unroll runtime iteration loop. In llvm::UnrollRuntimeLoopRemainder, if the loop to be unrolled is the inner loop inside a loop nest, the scalar evolution needs to be dropped for its parent loop which is done by ScalarEvolution::forgetLoop. However, we can postpone forgetLoop to the end of UnrollRuntimeLoopRemainder so TripCountSC expansion can still reuse existing value. Differential Revision: https://reviews.llvm.org/D23572 llvm-svn: 279748
41 lines
1.5 KiB
LLVM
41 lines
1.5 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -verify-scev-maps -S |FileCheck %s
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; SCEV expansion uses existing value when the SCEV has no AddRec expr.
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; CHECK-LABEL: @foo(
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; CHECK: select
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; CHECK-NOT: select
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; CHECK: ret
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@a = common global [1000 x i16] zeroinitializer, align 16
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define i32 @foo(i32 %x, i32 %y) {
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entry:
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%cmp = icmp slt i32 %x, %y
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%cond = select i1 %cmp, i32 %x, i32 %y
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%cmp1.10 = icmp sgt i32 %cond, 0
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br i1 %cmp1.10, label %for.body.lr.ph, label %for.end
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for.body.lr.ph: ; preds = %entry
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%tmp = sext i32 %cond to i64
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br label %for.body
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for.body: ; preds = %for.body, %for.body.lr.ph
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%indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
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%total.011 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds [1000 x i16], [1000 x i16]* @a, i64 0, i64 %indvars.iv
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%tmp1 = load i16, i16* %arrayidx, align 2
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%conv = sext i16 %tmp1 to i32
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%add = add nsw i32 %conv, %total.011
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%cmp1 = icmp slt i64 %indvars.iv.next, %tmp
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br i1 %cmp1, label %for.body, label %for.end.loopexit
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for.end.loopexit: ; preds = %for.body
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%add.lcssa = phi i32 [ %add, %for.body ]
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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%total.0.lcssa = phi i32 [ 0, %entry ], [ %add.lcssa, %for.end.loopexit ]
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ret i32 %total.0.lcssa
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}
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