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774ae973b9
factory functions for the two modes the loop unroller is actually used in in-tree: simplified full-unrolling and the entire thing including partial unrolling. I've also wired these up to nice names so you can express both of these being in a pipeline easily. This is a precursor to actually enabling these parts of the O2 pipeline. Differential Revision: https://reviews.llvm.org/D28897 llvm-svn: 293136
30 lines
1.2 KiB
LLVM
30 lines
1.2 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-max-iteration-count-to-analyze=100 -unroll-threshold=10 -unroll-max-percent-threshold-boost=200 | FileCheck %s
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; RUN: opt < %s -S -passes='require<opt-remark-emit>,loop(unroll-full)' -unroll-max-iteration-count-to-analyze=100 -unroll-threshold=10 -unroll-max-percent-threshold-boost=200 | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; When examining gep-instructions we shouldn't consider them simplified if the
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; corresponding memory access isn't simplified. Doing the opposite might bias
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; our estimate, so that we might decide to unroll even a simple memcpy loop.
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;
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; Thus, the following loop shouldn't be unrolled:
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; CHECK-LABEL: @not_simplified_geps
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; CHECK: br i1 %
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; CHECK: ret void
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define void @not_simplified_geps(i32* noalias %b, i32* noalias %c) {
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entry:
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br label %for.body
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for.body:
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%iv.0 = phi i64 [ 0, %entry ], [ %iv.1, %for.body ]
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%arrayidx1 = getelementptr inbounds i32, i32* %b, i64 %iv.0
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%x1 = load i32, i32* %arrayidx1, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %c, i64 %iv.0
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store i32 %x1, i32* %arrayidx2, align 4
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%iv.1 = add nuw nsw i64 %iv.0, 1
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%exitcond = icmp eq i64 %iv.1, 10
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret void
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}
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