ea2aef4a1d
Summary: Unroll factor (Count) calculations moved to a new function. Early exits on pragma and "-unroll-count" defined factor added. New type of unrolling "Force" introduced (previously used implicitly). New unroll preference "AllowRemainder" introduced and set "true" by default. (should be set to false for architectures that suffers from it). Reviewers: hfinkel, mzolotukhin, zzheng Differential Revision: http://reviews.llvm.org/D19553 From: Evgeny Stupachenko <evstupac@gmail.com> llvm-svn: 271071
30 lines
1.2 KiB
LLVM
30 lines
1.2 KiB
LLVM
; RUN: opt < %s -S -unroll-threshold=20 -loop-unroll -unroll-allow-partial -unroll-runtime -unroll-allow-remainder -unroll-dynamic-cost-savings-discount=0 | FileCheck %s
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; The Loop TripCount is 9. However unroll factors 3 or 9 exceed given threshold.
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; The test checks that we choose a smaller, power-of-two, unroll count and do not give up on unrolling.
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; CHECK: for.body:
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; CHECK: store
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; CHECK: for.body.1:
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; CHECK: store
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define void @foo(i32* nocapture %a, i32* nocapture readonly %b) nounwind uwtable {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 1, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%ld = load i32, i32* %arrayidx, align 4
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%idxprom1 = sext i32 %ld to i64
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%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %idxprom1
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%st = trunc i64 %indvars.iv to i32
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store i32 %st, i32* %arrayidx2, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 10
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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