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2006-06-04Various clean-ups suggested by Chris.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28678 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-03Fix a bug in Phi-noded insertion. Also, update some comments to reflect what'sOwen Anderson
actually going on. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28677 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-02Remove unneeded hook. Patch by Anton K. Thanks!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28664 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-02Force anything that #includes llvm/Transforms/Utils/UnifyFunctionExitNodes.hChris Lattner
to link in the implementation. Thanks to Anton Korobeynikov for figuring out what was going on here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28660 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-01Remove dead #includeChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28642 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-01Make the "pruning cloner" smarter. As it propagates constants through theChris Lattner
code (while cloning) it often gets the branch/switch instructions. Since it knows that edges of the CFG are dead, it need not clone (or even look) at the obviously dead blocks. This should speed up the inliner substantially on code where there are lots of inlinable calls to functions with constant arguments. On C++ code in particular, this kicks in. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28641 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-01Silence a -pedantic warning.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28632 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-01Remove a FIXME that was fixed with my last patch.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28619 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-01More cleanups. Also, add a special case for updating PHI nodes, andOwen Anderson
reimplement getValueDominatingFunction to walk the DominanceTree rather than just searching blindly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28618 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-31Swap the order of operands created here. For +&|^, the order doesn't matter,Chris Lattner
but for sub, it really does! Fix fixes a miscompilation of fibheap_cut in llvmgcc4. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28600 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-31Extract a huge loop into a helper method. Fix a few iterator-invalidation bugs.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28599 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-29Add Use replacement. Assuming there is nothing horribly wrong with this, LCSSAOwen Anderson
is now theoretically feature-complete. It has not, however, been thoroughly test, and is still considered experimental. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28529 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-28Major think-o. Iterate over all live out-of-loop values, and perform theOwen Anderson
other calculations on each individually, rather than trying to delay it and do them all at the end. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28527 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-27Make LCSSA insert proper Phi nodes throughout the rest of the CFG by computingOwen Anderson
the iterated Dominance Frontier of the loop-closure Phi's. This is the second phase of the LCSSA pass. The third phase (coming soon) will be to update all uses of loop variables to use the loop-closure Phi's instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28524 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-27Fix some regression from the inliner patch I committed last night. This fixesChris Lattner
ldecod, lencod, and SPASS. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28523 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-27Switch the inliner over to using CloneAndPruneFunctionInto. This effectivelyChris Lattner
makes it so that it constant folds instructions on the fly. This is good for several reasons: 0. Many instructions are constant foldable after inlining, particularly if inlining a call with constant arguments. 1. Without this, the inliner has to allocate memory for all of the instructions that can be constant folded, then a subsequent pass has to delete them. This gets the job done without this extra work. 2. This makes the inliner *pass* a bit more aggressive: in particular, it partially solves a phase order issue where the inliner would inline lots of code that folds away to nothing, but think that the resultant function is big because of this code that will be gone. Now the code never exists. This is the first part of a 2-step process. The second part will be smart enough to see when this implicit constant folding propagates a constant into a branch or switch instruction, making CFG edges dead. This implements Transforms/Inline/inline_constprop.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28521 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-27Implement a new method, CloneAndPruneFunctionInto, as documented.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28519 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-27Refactor some code to expose an interface to constant fold and instruction ↵Chris Lattner
given it's opcode, typeand operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28517 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-27A few small clean-ups, and the addition of an LCSSA statistic.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28512 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-26Fix a copy-and-paste-o that would break some compilers.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28507 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-26Clean up and refactor LCSSA a bunch. It should also run faster now, thoughOwen Anderson
there's still a lot of work to be done on it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28506 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-26Implement Transforms/InstCombine/store.ll:test2.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28503 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-26Skeletal LCSSA pass. This is currently non-functional. Expect functionalityOwen Anderson
and documentation updates soo. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28495 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-26Transform things like (splat(splat)) -> splatChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28490 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-25Introduce a helper function that simplifies interpretation of shuffle masks.Chris Lattner
No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28489 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-25Turn (cast (shuffle (cast)) -> shuffle (cast) if it reduces the # casts inChris Lattner
the program. This exposes more opportunities for the instcombiner, and implements vec_shuffle.ll:test6 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28487 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-25extract element from a shuffle vector can be trivially turned into anChris Lattner
extractelement from the SV's source. This implement vec_shuffle.ll:test[45] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28485 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-25Revert a patch that is unsafe, due to out of range array accesses in innerChris Lattner
array scopes possibly accessing valid memory in outer subscripts. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28478 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-24Patch for a new instcombine xform, patch contributed by Nick Lewycky!Chris Lattner
This implements Transforms/InstCombine/2006-05-10-InvalidIndexUndef.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28450 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-24Patches to make the LLVM sources more -pedantic clean. Patch providedChris Lattner
by Anton Korobeynikov! This is a step towards closing PR786. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28447 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-20Silence a bogus gcc warningChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28422 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-19Fix a doxygen problem and break lines at 80 columnsReid Spencer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28395 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-17Declare that lowerinvoke doesn't interact with other lowering passes.Chris Lattner
Patch written by Domagoj Babic! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28367 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-17Add a CloneModule call that exposes the mapping of values from the old moduleChris Lattner
to the new module. Patch provided by Nick Lewycky! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28349 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-14remove some dead code identified by coverityChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28289 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-14remove dead variablesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28286 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-14Backing out last check-in for now. It's causing an infinite loop gccas lencode.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28284 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-13Add/Sub/Mul are safe to promote here as well. Incrementing a single-bitChris Lattner
bitfield now gives this code: _plus: lwz r2, 0(r3) rlwimi r2, r2, 0, 1, 31 xoris r2, r2, 32768 stw r2, 0(r3) blr instead of this: _plus: lwz r2, 0(r3) srwi r4, r2, 31 slwi r4, r4, 31 addis r4, r4, -32768 rlwimi r2, r4, 0, 0, 0 stw r2, 0(r3) blr this can obviously still be improved. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28275 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-13Implement simple promotion for cast elimination in instcombine. This isChris Lattner
currently very limited, but can be extended in the future. For example, we now compile: uint %test30(uint %c1) { %c2 = cast uint %c1 to ubyte %c3 = xor ubyte %c2, 1 %c4 = cast ubyte %c3 to uint ret uint %c4 } to: _xor: movzbl 4(%esp), %eax xorl $1, %eax ret instead of: _xor: movb $1, %al xorb 4(%esp), %al movzbl %al, %eax ret More impressively, we now compile: struct B { unsigned bit : 1; }; void xor(struct B *b) { b->bit = b->bit ^ 1; } To (X86/PPC): _xor: movl 4(%esp), %eax xorl $-2147483648, (%eax) ret _xor: lwz r2, 0(r3) xoris r2, r2, 32768 stw r2, 0(r3) blr instead of (X86/PPC): _xor: movl 4(%esp), %eax movl (%eax), %ecx movl %ecx, %edx shrl $31, %edx # TRUNCATE movb %dl, %dl xorb $1, %dl movzbl %dl, %edx andl $2147483647, %ecx shll $31, %edx orl %ecx, %edx movl %edx, (%eax) ret _xor: lwz r2, 0(r3) srwi r4, r2, 31 xori r4, r4, 1 rlwimi r2, r4, 31, 0, 0 stw r2, 0(r3) blr This implements InstCombine/cast.ll:test30. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28273 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-12Remove some dead variables.Chris Lattner
Fix a nasty bug in the memcmp optimizer where we used the wrong variable! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28269 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-12Remove dead stuffChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28268 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-11Refactor some code, making it simpler.Chris Lattner
When doing the initial pass of constant folding, if we get a constantexpr, simplify the constant expr like we would do if the constant is folded in the normal loop. This fixes the missed-optimization regression in Transforms/InstCombine/getelementptr.ll last night. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28224 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-10Two changes:Chris Lattner
1. Implement InstCombine/deadcode.ll by not adding instructions in unreachable blocks (due to constants in conditional branches/switches) to the worklist. This causes them to be deleted before instcombine starts up, leading to better optimization. 2. In the prepass over instructions, do trivial constprop/dce as we go. This has the effect of improving the effectiveness of #1. In addition, it *significantly* speeds up instcombine on test cases with large amounts of constant folding code (for example, that produced by code specialization or partial evaluation). In one example, it speeds up instcombine from 0.0589s to 0.0224s with a release build (a 2.6x speedup). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28215 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-09Patch to make some xforms preserve each other. Patch contributed byChris Lattner
Domagoj Babic! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28181 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-06Move some code around.Chris Lattner
Make the "fold (and (cast A), (cast B)) -> (cast (and A, B))" transformation only apply when both casts really will cause code to be generated. If one or both doesn't, then this xform doesn't remove a cast. This fixes Transforms/InstCombine/2006-05-06-Infloop.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28141 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Fix an infinite loop compiling oggenc last night.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28128 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Implement InstCombine/cast.ll:test29Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28126 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-04Fix Transforms/InstCombine/2006-05-04-DemandedBitCrash.llChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28101 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-02Add pass ID's for various passes, so they can be AddRequiredID. Patch byChris Lattner
Domagoj Babic! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28048 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-28Fix InstCombine/2006-04-28-ShiftShiftLongLong.llChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28019 91177308-0d34-0410-b5e6-96231b3b80d8
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