4c11b5268c
This patch generalizes the UnrollLoop utility to support loops that exit from the header instead of the latch. Usually, LoopRotate would take care of must of those cases, but in some cases (e.g. -Oz), LoopRotate does not kick in. Codesize impact looks relatively neutral on ARM64 with -Oz + LTO. Program master patch diff External/S.../CFP2006/447.dealII/447.dealII 629060.00 627676.00 -0.2% External/SPEC/CINT2000/176.gcc/176.gcc 1245916.00 1244932.00 -0.1% MultiSourc...Prolangs-C/simulator/simulator 86100.00 86156.00 0.1% MultiSourc...arks/Rodinia/backprop/backprop 66212.00 66252.00 0.1% MultiSourc...chmarks/Prolangs-C++/life/life 67276.00 67312.00 0.1% MultiSourc...s/Prolangs-C/compiler/compiler 69824.00 69788.00 -0.1% MultiSourc...Prolangs-C/assembler/assembler 86672.00 86696.00 0.0% Reviewers: efriedma, vsk, paquette Reviewed By: paquette Differential Revision: https://reviews.llvm.org/D61962 llvm-svn: 364398
40 lines
1.6 KiB
LLVM
40 lines
1.6 KiB
LLVM
; RUN: opt -S -loop-unroll -unroll-runtime -unroll-count=2 -verify-loop-info -pass-remarks=loop-unroll < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Verify that runtime-unrolling a top-level loop that has nested loops does not
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; make the unroller produce invalid loop-info.
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; CHECK: remark: {{.*}}: unrolled loop by a factor of 2 with run-time trip count
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; CHECK: @widget
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; CHECK: ret void
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define void @widget(double* %arg, double* %arg1, double* %p, i64* %q1, i64* %q2) local_unnamed_addr {
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entry:
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br label %header.outer
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header.outer: ; preds = %latch.outer, %entry
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%tmp = phi double* [ %tmp8, %latch.outer ], [ %arg, %entry ]
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br label %header.inner
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header.inner: ; preds = %latch.inner, %header.outer
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%tmp5 = load i64, i64* %q1, align 8
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%tmp6 = icmp eq double* %p, %arg
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br i1 undef, label %exiting.inner, label %latch.outer
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exiting.inner: ; preds = %latch.inner, %header.outer
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br i1 undef, label %latch.inner, label %latch.outer
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latch.inner: ; preds = %header.inner
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store i64 %tmp5, i64* %q2, align 8
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br label %header.inner
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latch.outer: ; preds = %header.inner
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store double 0.0, double* %p, align 8
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%tmp8 = getelementptr inbounds double, double* %tmp, i64 1
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%tmp9 = icmp eq double* %tmp8, %arg1
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br i1 %tmp9, label %exit, label %header.outer
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exit: ; preds = %latch.outer
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ret void
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}
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