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[LoopUnrollAndJam] Allow unroll and jam loops forced by user.

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Summary: Allow unroll and jam loops forced by user.
LoopUnrollAndJamPass is still disabled by default in the NPM pipeline,
and can be controlled by -enable-npm-unroll-and-jam.

Reviewed By: Meinersbur, dmgreen

Differential Revision: https://reviews.llvm.org/D87786
This commit is contained in:
Whitney Tsang 2020-09-17 17:53:26 +00:00
parent 868b57b4b2
commit ce3c753838
2 changed files with 9 additions and 6 deletions
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11
lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp
View File

@ -288,6 +288,13 @@ tryToUnrollAndJamLoop(Loop *L, DominatorTree &DT, LoopInfo *LI,
None, None, None, None, None);
TargetTransformInfo::PeelingPreferences PP =
gatherPeelingPreferences(L, SE, TTI, None, None);
TransformationMode EnableMode = hasUnrollAndJamTransformation(L);
if (EnableMode & TM_Disable)
return LoopUnrollResult::Unmodified;
if (EnableMode & TM_ForcedByUser)
UP.UnrollAndJam = true;
if (AllowUnrollAndJam.getNumOccurrences() > 0)
UP.UnrollAndJam = AllowUnrollAndJam;
if (UnrollAndJamThreshold.getNumOccurrences() > 0)
@ -300,10 +307,6 @@ tryToUnrollAndJamLoop(Loop *L, DominatorTree &DT, LoopInfo *LI,
<< L->getHeader()->getParent()->getName() << "] Loop %"
<< L->getHeader()->getName() << "\n");
TransformationMode EnableMode = hasUnrollAndJamTransformation(L);
if (EnableMode & TM_Disable)
return LoopUnrollResult::Unmodified;
// A loop with any unroll pragma (enabling/disabling/count/etc) is left for
// the unroller, so long as it does not explicitly have unroll_and_jam
// metadata. This means #pragma nounroll will disable unroll and jam as well

4
test/Transforms/LoopUnrollAndJam/pragma-explicit.ll
View File

@ -1,5 +1,5 @@
; RUN: opt -loop-unroll-and-jam -allow-unroll-and-jam -unroll-runtime -unroll-partial-threshold=60 < %s -S | FileCheck %s
; RUN: opt -aa-pipeline=tbaa,basic-aa -passes='loop-unroll-and-jam' -allow-unroll-and-jam -unroll-runtime -unroll-partial-threshold=60 < %s -S | FileCheck %s
; RUN: opt -loop-unroll-and-jam -unroll-runtime -unroll-partial-threshold=60 < %s -S | FileCheck %s
; RUN: opt -aa-pipeline=tbaa,basic-aa -passes='loop-unroll-and-jam' -unroll-runtime -unroll-partial-threshold=60 < %s -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"