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[NVPTX] Emit .pragma "nounroll" for loops marked with nounroll

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Summary:
CUDA driver can unroll loops when jit-compiling PTX. To prevent CUDA
driver from unrolling a loop marked with llvm.loop.unroll.disable is not
unrolled by CUDA driver, we need to emit .pragma "nounroll" at the
header of that loop.

This patch also extracts getting unroll metadata from loop ID metadata
into a shared helper function.

Test Plan: test/CodeGen/NVPTX/nounroll.ll

Reviewers: eliben, meheff, jholewinski

Reviewed By: jholewinski

Subscribers: jholewinski, llvm-commits

Differential Revision: http://reviews.llvm.org/D7041

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227703 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jingyue Wu
2015-02-01 02:27:45 +00:00
parent 58e57f1604
commit f15b696b79
7 changed files with 124 additions and 26 deletions
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5
include/llvm/Transforms/Utils/UnrollLoop.h
View File

@ -16,12 +16,15 @@
#ifndef LLVM_TRANSFORMS_UTILS_UNROLLLOOP_H
#define LLVM_TRANSFORMS_UTILS_UNROLLLOOP_H
#include "llvm/ADT/StringRef.h"
namespace llvm {
class AssumptionCache;
class Loop;
class LoopInfo;
class LPPassManager;
class MDNode;
class Pass;
bool UnrollLoop(Loop *L, unsigned Count, unsigned TripCount, bool AllowRuntime,
@ -30,6 +33,8 @@ bool UnrollLoop(Loop *L, unsigned Count, unsigned TripCount, bool AllowRuntime,
bool UnrollRuntimeLoopProlog(Loop *L, unsigned Count, LoopInfo *LI,
LPPassManager* LPM);
const MDNode *GetUnrollMetadata(const MDNode *LoopID, StringRef Name);
}
#endif