56 lines
2.0 KiB
LLVM
56 lines
2.0 KiB
LLVM
; RUN: opt -S < %s -loop-idiom | FileCheck %s
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; CHECK-NOT: memset
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; check that memset is not generated (for stores) because that will result
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; in udiv hoisted out of the loop by the SCEV Expander
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; TODO: ideally we should be able to generate memset
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; if SCEV expander is taught to generate the dependencies
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; at the right point.
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@a = global i32 0, align 4
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@b = global i32 0, align 4
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@c = external local_unnamed_addr global [1 x i8], align 1
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define void @e() local_unnamed_addr {
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entry:
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%d0 = load i32, i32* @a, align 4
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%d1 = load i32, i32* @b, align 4
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br label %for.cond1thread-pre-split
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for.cond1thread-pre-split: ; preds = %for.body5, %entry
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%div = udiv i32 %d0, %d1
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br label %for.body5
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for.body5: ; preds = %for.body5, %for.cond1thread-pre-split
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%indvars.iv = phi i64 [ 0, %for.cond1thread-pre-split ], [ %indvars.iv.next, %for.body5 ]
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%divx = sext i32 %div to i64
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%0 = add nsw i64 %divx, %indvars.iv
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%arrayidx = getelementptr inbounds [1 x i8], [1 x i8]* @c, i64 0, i64 %0
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store i8 0, i8* %arrayidx, align 1
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%indvars.iv.next = add nsw i64 %indvars.iv, 1
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%1 = trunc i64 %indvars.iv.next to i32
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%tobool4 = icmp eq i32 %1, 0
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br i1 %tobool4, label %for.cond1thread-pre-split, label %for.body5
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}
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; The loop's trip count is depending on an unsafe operation
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; udiv. SCEV expander hoists it out of the loop, so loop-idiom
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; should check that the memset is not generated in this case.
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define void @f(i32 %a, i32 %b, i8* nocapture %x) local_unnamed_addr {
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entry:
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br label %for.body
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for.body: ; preds = %for.body6, %entry
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%div = udiv i32 %a, %b
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%conv = zext i32 %div to i64
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br label %for.body6
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for.body6: ; preds = %for.body6, %for.body
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%i.09 = phi i64 [ %inc, %for.body6 ], [ 0, %for.body ]
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%arrayidx = getelementptr inbounds i8, i8* %x, i64 %i.09
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store i8 0, i8* %arrayidx, align 1
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%inc = add nuw nsw i64 %i.09, 1
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%cmp3 = icmp slt i64 %inc, %conv
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br i1 %cmp3, label %for.body6, label %for.body
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}
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