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779136fbf4
single-iteration loop This fixes PR34681. Avoid adding the "Stride == 1" predicate when we know that Stride >= Trip-Count. Such a predicate will effectively optimize a single or zero iteration loop, as Trip-Count <= Stride == 1. Differential Revision: https://reviews.llvm.org/D38785 llvm-svn: 317438
123 lines
3.7 KiB
LLVM
123 lines
3.7 KiB
LLVM
; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; Check the scenario where we have an unknown Stride, which happens to also be
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; the loop iteration count, so if we specialize the loop for the Stride==1 case,
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; this also implies that the loop will iterate no more than a single iteration,
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; as in the following example:
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;
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; unsigned int N;
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; int tmp = 0;
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; for(unsigned int k=0;k<N;k++) {
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; tmp+=(int)B[k*N+j];
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; }
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;
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; We check here that the following runtime scev guard for Stride==1 is NOT generated:
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; vector.scevcheck:
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; %ident.check = icmp ne i32 %N, 1
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; %0 = or i1 false, %ident.check
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; br i1 %0, label %scalar.ph, label %vector.ph
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; Instead the loop is vectorized with an unknown stride.
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; CHECK-LABEL: @foo1
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; CHECK: for.body.lr.ph
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; CHECK-NOT: %ident.check = icmp ne i32 %N, 1
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; CHECK-NOT: %[[TEST:[0-9]+]] = or i1 false, %ident.check
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; CHECK-NOT: br i1 %[[TEST]], label %scalar.ph, label %vector.ph
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; CHECK: vector.ph
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; CHECK: vector.body
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; CHECK: <4 x i32>
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; CHECK: middle.block
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; CHECK: scalar.ph
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define i32 @foo1(i32 %N, i16* nocapture readnone %A, i16* nocapture readonly %B, i32 %i, i32 %j) {
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entry:
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%cmp8 = icmp eq i32 %N, 0
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br i1 %cmp8, label %for.end, label %for.body.lr.ph
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for.body.lr.ph:
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br label %for.body
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for.body:
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%tmp.010 = phi i32 [ 0, %for.body.lr.ph ], [ %add1, %for.body ]
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%k.09 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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%mul = mul i32 %k.09, %N
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%add = add i32 %mul, %j
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%arrayidx = getelementptr inbounds i16, i16* %B, i32 %add
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%0 = load i16, i16* %arrayidx, align 2
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%conv = sext i16 %0 to i32
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%add1 = add nsw i32 %tmp.010, %conv
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%inc = add nuw i32 %k.09, 1
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%exitcond = icmp eq i32 %inc, %N
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit:
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%add1.lcssa = phi i32 [ %add1, %for.body ]
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br label %for.end
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for.end:
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%tmp.0.lcssa = phi i32 [ 0, %entry ], [ %add1.lcssa, %for.end.loopexit ]
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ret i32 %tmp.0.lcssa
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}
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; Check the same, but also where the Stride and the loop iteration count
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; are not of the same data type.
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;
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; unsigned short N;
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; int tmp = 0;
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; for(unsigned int k=0;k<N;k++) {
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; tmp+=(int)B[k*N+j];
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; }
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;
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; We check here that the following runtime scev guard for Stride==1 is NOT generated:
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; vector.scevcheck:
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; %ident.check = icmp ne i16 %N, 1
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; %0 = or i1 false, %ident.check
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; br i1 %0, label %scalar.ph, label %vector.ph
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; CHECK-LABEL: @foo2
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; CHECK: for.body.lr.ph
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; CHECK-NOT: %ident.check = icmp ne i16 %N, 1
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; CHECK-NOT: %[[TEST:[0-9]+]] = or i1 false, %ident.check
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; CHECK-NOT: br i1 %[[TEST]], label %scalar.ph, label %vector.ph
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; CHECK: vector.ph
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; CHECK: vector.body
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; CHECK: <4 x i32>
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; CHECK: middle.block
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; CHECK: scalar.ph
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define i32 @foo2(i16 zeroext %N, i16* nocapture readnone %A, i16* nocapture readonly %B, i32 %i, i32 %j) {
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entry:
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%conv = zext i16 %N to i32
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%cmp11 = icmp eq i16 %N, 0
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br i1 %cmp11, label %for.end, label %for.body.lr.ph
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for.body.lr.ph:
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br label %for.body
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for.body:
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%tmp.013 = phi i32 [ 0, %for.body.lr.ph ], [ %add4, %for.body ]
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%k.012 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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%mul = mul nuw i32 %k.012, %conv
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%add = add i32 %mul, %j
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%arrayidx = getelementptr inbounds i16, i16* %B, i32 %add
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%0 = load i16, i16* %arrayidx, align 2
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%conv3 = sext i16 %0 to i32
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%add4 = add nsw i32 %tmp.013, %conv3
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%inc = add nuw nsw i32 %k.012, 1
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%exitcond = icmp eq i32 %inc, %conv
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit:
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%add4.lcssa = phi i32 [ %add4, %for.body ]
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br label %for.end
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for.end:
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%tmp.0.lcssa = phi i32 [ 0, %entry ], [ %add4.lcssa, %for.end.loopexit ]
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ret i32 %tmp.0.lcssa
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}
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