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path: root/lib/Analysis/ScalarEvolution.cpp
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2005-04-21Remove trailing whitespaceMisha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21416 91177308-0d34-0410-b5e6-96231b3b80d8
2005-04-06Don't make this require loopsimplify. It works BETTER with loop simplifyChris Lattner
but should not require it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21123 91177308-0d34-0410-b5e6-96231b3b80d8
2005-03-09Export two methods for getting -X and A-B.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20527 91177308-0d34-0410-b5e6-96231b3b80d8
2005-02-26DCE a dead functionChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20339 91177308-0d34-0410-b5e6-96231b3b80d8
2005-02-261 + 100 + 51 == 152, not 52.Chris Lattner
If we fold three constants together (c1+c2+c3), make sure to keep LHSC updated, instead of reusing (in this case), the 1 instead of the partial sum. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20337 91177308-0d34-0410-b5e6-96231b3b80d8
2005-02-17Scary typo that fixes ↵Chris Lattner
Regression/Transforms/IndVarsSimplify/2005-02-17-TruncateExprCrash.ll and PR515. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20224 91177308-0d34-0410-b5e6-96231b3b80d8
2005-02-13Correct the recursive PHI node handling routines in a way that CANNOT induceChris Lattner
infinite loops (using the new replaceSymbolicValuesWithConcrete method). This patch reverts this patch: http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050131/023830.html ... which was an attempted fix for this problem. Unfortunately, that patch caused test/Regression/Transforms/IndVarsSimplify/exit_value_tests.llx to fail and slightly castrated the entire analysis. This patch fixes it right. This patch is dedicated to jeffc, for making me deal with this. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20146 91177308-0d34-0410-b5e6-96231b3b80d8
2005-02-01Fix a problem where we could infinitely recurse on phi nodes.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19955 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-07For PR387:\Reid Spencer
Make only one print method to avoid overloaded virtual warnings when \ compiled with -Woverloaded-virtual git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18589 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-04This patch prevents an infinite recursion while compiling 103.su2cor.Chris Lattner
All SPEC CFP 95 programs now work, though the JIT isn't loading -lf2c right so they aren't testing correctly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18499 91177308-0d34-0410-b5e6-96231b3b80d8
2004-10-25Patch to support MSVC, contributed by Morten OfstadChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17214 91177308-0d34-0410-b5e6-96231b3b80d8
2004-10-12This nutty patch has been in my tree since before 1.3 went out, and it needsChris Lattner
to go in. This patch allows us to compute the trip count of loops controlled by values loaded from constant arrays. The cannonnical example of this is strlen when passed a constant argument: for (int i = 0; "constantstring"[i]; ++i) ; return i; In this case, it will compute that the loop executes 14 times, which means that the exit value of i is 14. Because of this, the loop gets DCE'd and we are happy. This also applies to anything that does similar things, e.g. loops like this: const float Array[] = { 0.1, 2.1, 3.2, 23.21 }; for (int i = 0; Array[i] < 20; ++i) and is actually fairly general. The problem with this is that it almost never triggers. The reason is that we run indvars and the loop optimizer only at compile time, which is before things like strlen and strcpy have been inlined into the program from libc. Because of this, it almost never is used (it triggers twice in specint2k). I'm committing it because it DOES work, may be useful in the future, and doesn't slow us down at all. If/when we start running the loop optimizer at link-time (-O4?) this will be very nice indeed :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16926 91177308-0d34-0410-b5e6-96231b3b80d8
2004-10-11Fix SingleSource/Benchmarks/McGill/chompChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16912 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-03Fixes to make LLVM compile with vc7.1.Alkis Evlogimenos
Patch contributed by Paolo Invernizzi! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16152 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-01Changes For Bug 352Reid Spencer
Move include/Config and include/Support into include/llvm/Config, include/llvm/ADT and include/llvm/Support. From here on out, all LLVM public header files must be under include/llvm/. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16137 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-18bug 122:Reid Spencer
- Replace ConstantPointerRef usage with GlobalValue usage - Minimize redundant isa<GlobalValue> usage - Correct isa<Constant> for GlobalValue subclass git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14942 91177308-0d34-0410-b5e6-96231b3b80d8
2004-06-24Remove distasteful method which is really part of the indvars passChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14359 91177308-0d34-0410-b5e6-96231b3b80d8
2004-06-20REALLY fix PR378: crash in scalar evolution analysisChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14275 91177308-0d34-0410-b5e6-96231b3b80d8
2004-06-20Fix a bug in my change last night that caused a few test failures.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14270 91177308-0d34-0410-b5e6-96231b3b80d8
2004-06-20Do not sort SCEV objects by address: instead sort by complexity and groupChris Lattner
by address. This prevents the resultant SCEV objects from depending on where in memory other scev objects happen to live. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14263 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-27Changes to fix up the inst_iterator to pass to boost iterator checks. ThisChris Lattner
patch was graciously contributed by Vladimir Prus. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13185 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-23Eliminate all of the SCEV Expansion code which is really part of theChris Lattner
IndVars pass, not part of SCEV *analysis*. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13134 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-19It's not just a printer, it's actually an analysis tooChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13064 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-18Change the ExitBlocks list from being explicitly contained in the LoopChris Lattner
structure to being dynamically computed on demand. This makes updating loop information MUCH easier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13045 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-17Add the ability to compute exit values for complex loop using unanalyzableChris Lattner
operations. This allows us to compile this testcase: int main() { int h = 1; do h = 3 * h + 1; while (h <= 256); printf("%d\n", h); return 0; } into this: int %main() { entry: call void %__main( ) %tmp.6 = call int (sbyte*, ...)* %printf( sbyte* getelementptr ([4 x sbyte]* %.str_1, long 0, long 0), int 364 ) ; <int> [#uses=0] ret int 0 } This testcase was taken directly from 256.bzip2, believe it or not. This code is not as general as I would like. Next up is to refactor it a bit to handle more cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13019 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-17Add the ability to compute trip counts that are only controlled by constantsChris Lattner
even if the loop is using expressions that we can't compute as a closed-form. This allows us to calculate that this function always returns 55: int test() { double X; int Count = 0; for (X = 100; X > 1; X = sqrt(X), ++Count) /*empty*/; return Count; } And allows us to compute trip counts for loops like: int h = 1; do h = 3 * h + 1; while (h <= 256); (which occurs in bzip2), and for this function, which occurs after inlining and other optimizations: int popcount() { int x = 666; int result = 0; while (x != 0) { result = result + (x & 0x1); x = x >> 1; } return result; } We still cannot compute the exit values of result or h in the two loops above, which means we cannot delete the loop, but we are getting closer. Being able to compute a constant trip count for these two loops will allow us to unroll them completely though. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13017 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-16Include <cmath> for compatibility with gcc 3.0.x (the system compiler onBrian Gaeke
Debian.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12986 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-15Factor a bunch of classes out into a public headerChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12958 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-15Unbreak the buildChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12956 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-14Implement a FIXME: if we're going to insert a cast, we might as well onlyChris Lattner
insert it once! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12955 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-14This is a trivial tweak to the addrec insertion code: insert the incrementChris Lattner
at the bottom of the loop instead of the top. This reduces the number of overlapping live ranges a lot, for example, eliminating a spill in an important loop in 183.equake with linear scan. I still need to make the exit comparison of the loop use the post-incremented version of this variable, but this is an easy first step. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12952 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-07Fix a bug Brian found.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12754 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-05Sparc don't got not "sqrtl", bum bum bumChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12670 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-05Kill warnings during an optimized compile where assert() disappears.Misha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12669 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-05Fix PR312 and IndVarsSimplify/2004-04-05-InvokeCastCrash.llxChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12668 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-03Add a break in the default caseChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12639 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-02Comment out debugging printoutsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12623 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-02Add a new analysisChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12619 91177308-0d34-0410-b5e6-96231b3b80d8
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