diff options
Diffstat (limited to 'polly/lib/CodeGen/BlockGenerators.cpp')
| -rw-r--r-- | polly/lib/CodeGen/BlockGenerators.cpp | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/polly/lib/CodeGen/BlockGenerators.cpp b/polly/lib/CodeGen/BlockGenerators.cpp index 1bd8df43f1a..7109d6a0650 100644 --- a/polly/lib/CodeGen/BlockGenerators.cpp +++ b/polly/lib/CodeGen/BlockGenerators.cpp @@ -380,12 +380,15 @@ Value *BlockGenerator::getOrCreateAlloca(const ScopArrayInfo *Array) { // to the parallel subfunction and each request for a scalar alloca slot // must be forwared to the temporary in-subfunction slot. This mapping is // removed when the subfunction has been generated and again normal host - // code is generated. As GlobalMap may be changed multiple times (for - // each parallel loop), is commonly only known after the initial alloca - // has been generated, and the original alloca value must be restored at - // the end, it is not possible to perform the GlobalMap lookup right after - // creating the alloca below, but instead we need to check GlobalMap at - // call to getOrCreateAlloca. + // code is generated. Due to the following reasons it is not possible to + // perform the GlobalMap lookup right after creating the alloca below, but + // instead we need to check GlobalMap at each call to getOrCreateAlloca: + // + // 1) GlobalMap may be changed multiple times (for each parallel loop), + // 2) The temporary mapping is commonly only known after the initial + // alloca has already been generated, and + // 3) The original alloca value must be restored after leaving the + // sub-function. if (Value *NewAddr = GlobalMap.lookup(&*Addr)) return NewAddr; return Addr; |
