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6cf07a80ff
This also required making recursive simplifications until nothing changes or a hard limit (currently 3) is hit. With the simplification in place indvars can canonicalize loops of the form for (unsigned i = 0; i < a-b; ++i) into for (unsigned i = 0; i != a-b; ++i) which used to fail because SCEV created a weird umax expr for the backedge taken count. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157701 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.5 KiB
LLVM
43 lines
1.5 KiB
LLVM
; RUN: opt -S -indvars < %s | FileCheck %s
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define void @test1(float* nocapture %autoc, float* nocapture %data, float %d, i32 %data_len, i32 %sample) nounwind {
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entry:
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%sub = sub i32 %data_len, %sample
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%cmp4 = icmp eq i32 %data_len, %sample
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br i1 %cmp4, label %for.end, label %for.body
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%0 = trunc i64 %indvars.iv to i32
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%add = add i32 %0, %sample
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%idxprom = zext i32 %add to i64
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%arrayidx = getelementptr inbounds float* %data, i64 %idxprom
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%1 = load float* %arrayidx, align 4
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%mul = fmul float %1, %d
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%arrayidx2 = getelementptr inbounds float* %autoc, i64 %indvars.iv
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%2 = load float* %arrayidx2, align 4
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%add3 = fadd float %2, %mul
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store float %add3, float* %arrayidx2, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%3 = trunc i64 %indvars.iv.next to i32
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%cmp = icmp ult i32 %3, %sub
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body, %entry
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ret void
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; CHECK: @test1
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; First check that we move the sub into the preheader, it doesn't have to be
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; executed if %cmp4 == false
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; CHECK: for.body.preheader:
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; CHECK: sub i32 %data_len, %sample
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; CHECK: br label %for.body
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; Second, check that we turn the IV test into an eq.
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; CHECK: %lftr.wideiv = trunc i64 %indvars.iv.next to i32
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; CHECK: %exitcond = icmp ne i32 %lftr.wideiv, %0
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; CHECK: br i1 %exitcond, label %for.body, label %for.end.loopexit
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}
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