- Nov 30, 2008
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Eli Friedman authored
as unsigned divisions. Same caveats as before. llvm-svn: 60284
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Eli Friedman authored
multiplies. Some more cleverness would be nice, though. It would be nice if we could do this transformation on illegal types. Also, we would prefer a narrower constant when possible so that we can use a narrower multiply, which can be cheaper. llvm-svn: 60283
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Bill Wendling authored
llvm-svn: 60279
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Bill Wendling authored
"For signed integers, the determination of overflow of x*y is not so simple. If x and y have the same sign, then overflow occurs iff xy > 2**31 - 1. If they have opposite signs, then overflow occurs iff xy < -2**31." In this case, x == -1. llvm-svn: 60278
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Eli Friedman authored
nearby FIXME. I'm not sure what the right way to fix the Cell test was; if the approach I used isn't okay, please let me know. llvm-svn: 60277
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Bill Wendling authored
overflowed on negation. This commit checks to make sure that neithe C nor X overflows. This requires that the RHS of X (a subtract instruction) be a constant integer. llvm-svn: 60275
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Chris Lattner authored
ReverseLocalDeps when we update it. This fixes a regression test failure from my last commit. Second, for each non-local cached information structure, keep a bit that indicates whether it is dirty or not. This saves us a scan over the whole thing in the common case when it isn't dirty. llvm-svn: 60274
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Chris Lattner authored
llvm-svn: 60272
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Chris Lattner authored
instead of containing them by value. This increases the density (!) of NonLocalDeps as well as making the reallocation case faster. This speeds up gvn on 403.gcc by 2% and makes room for future improvements. I'm not super thrilled with having to explicitly manage the new/delete of the map, but it is necesary for the next change. llvm-svn: 60271
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Chris Lattner authored
llvm-svn: 60268
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Chris Lattner authored
If we see that a load depends on the allocation of its memory with no intervening stores, we now return a 'None' depedency instead of "Normal". This tweaks GVN to do its optimization with the new result. llvm-svn: 60267
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Chris Lattner authored
method that returns its result as a DepResultTy instead of as a MemDepResult. This reduces conversion back and forth. llvm-svn: 60266
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Chris Lattner authored
the file, no functionality change. llvm-svn: 60265
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Chris Lattner authored
comments about what this class does. llvm-svn: 60264
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Chris Lattner authored
dependencies. The basic situation was this: consider if we had: store1 ... store2 ... store3 Where memdep thinks that store3 depends on store2 and store2 depends on store1. The problem happens when we delete store2: The code in question was updating dep info for store3 to be store1. This is a spiffy optimization, but is not safe at all, because aliasing isn't transitive. This bug isn't exposed today with DSE because DSE will only zap store2 if it is identifical to store 3, and in this case, it is safe to update it to depend on store1. However, memcpyopt is not so fortunate, which is presumably why the "dropInstruction" code used to exist. Since this doesn't actually provide a speedup in practice, just rip the code out. llvm-svn: 60263
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Chris Lattner authored
Fix a subtle iterator invalidation bug I introduced in the last commit. llvm-svn: 60258
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- Nov 29, 2008
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Chris Lattner authored
an entry in the nonlocal deps map, don't reset entries referencing that instruction to [dirty, null], instead, set them to [dirty,next] where next is the instruction after the deleted one. Use this information in the non-local deps code to avoid rescanning entire blocks. This speeds up GVN slightly by avoiding pointless work. On 403.gcc this makes GVN 1.5% faster. llvm-svn: 60256
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Chris Lattner authored
a smallvector instead of a DenseMap. This speeds up GVN by 5% on 403.gcc. llvm-svn: 60255
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Chris Lattner authored
no functionality/code change. llvm-svn: 60254
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Chris Lattner authored
formulation that is faster and doesn't require nonLazyHelper. Much less code. llvm-svn: 60253
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Chris Lattner authored
llvm-svn: 60251
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Chris Lattner authored
llvm-svn: 60242
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Chris Lattner authored
llvm-svn: 60241
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Chris Lattner authored
Put a some code back to handle buggy behavior that GVN expects: it wants loads to depend on each other, and accesses to depend on their allocations. llvm-svn: 60240
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Chris Lattner authored
Use getTypeStoreSize instead of ABITypeSize for in-memory size in a couple places. llvm-svn: 60238
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Chris Lattner authored
former does caching, the later doesn't. This dramatically simplifies the logic in getDependency and getDependencyFrom. llvm-svn: 60234
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Bill Wendling authored
llvm-svn: 60233
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Chris Lattner authored
Document the Dirty value more precisely, use it for the uninitialized DepResultTy value. Change reverse mappings to be from an instruction* instead of DepResultTy, and stop tracking other forms. This makes it more clear that we only care about the instruction cases. Eliminate a DepResultTy,bool pair by using Dirty in the local case as well, shrinking the map and simplifying the code. This speeds up GVN by ~3% on 403.gcc. llvm-svn: 60232
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Chris Lattner authored
query. This makes it crystal clear what cases can escape from MemDep that the clients have to handle. This also gives the clients a nice simplified interface to it that is easy to poke at. This patch also makes DepResultTy and MemoryDependenceAnalysis::DepType private, yay. llvm-svn: 60231
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Chris Lattner authored
of a pointer/int pair instead of a manually bitmangled pointer. This forces clients to think a little more about checking the appropriate pieces and will be useful for internal implementation improvements later. I'm not particularly happy with this. After going through this I don't think that the clients of memdep should be exposed to the internal type at all. I'll fix this in a subsequent commit. This has no functionality change. llvm-svn: 60230
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- Nov 28, 2008
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Chris Lattner authored
properly updates the reverse dependency map when it installs updated dependencies for instructions that depend on the removed instruction. llvm-svn: 60222
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Chris Lattner authored
llvm-svn: 60221
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Chris Lattner authored
no functionality change. llvm-svn: 60219
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Chris Lattner authored
llvm-svn: 60218
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Chris Lattner authored
This shows the root problem behind PR3141. llvm-svn: 60216
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Chris Lattner authored
but it doesn't make any sense at all. Also make the method const, private, and fit in 80 cols while we're at it. llvm-svn: 60215
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Chris Lattner authored
llvm-svn: 60213
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Chris Lattner authored
llvm-svn: 60211
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Chris Lattner authored
predecessor is itself. This doesn't make sense, and this is a dead infinite loop anyway. llvm-svn: 60210
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Duncan Sands authored
gcc 4.4 (due to use of sprintf). llvm-svn: 60209
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