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2011-05-22Fix grammar in test.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131831 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-21Revert "InstCombine: Turn mul.with.overflow(X, 2) into the cheaper ↵Benjamin Kramer
add.with.overflow(X, X)" It's better to do this in codegen, mul.with.overflow(X, 2) is more canonical because it has only one use on "X". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131798 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-21InstCombine: Turn mul.with.overflow(X, 2) into the cheaper ↵Benjamin Kramer
add.with.overflow(X, X) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131789 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-20Revert r131664 and fix it in instcombine instead. rdar://9467055Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131708 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-19Move test to Transforms/InstCombine.Stuart Hastings
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131634 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-19Add test for PR9946.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131621 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-18More instcombine cleanup, towards improving debug line info.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131604 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-18When forming an ICmpZero LSRUse, normalize the non-IV operandDan Gohman
of the comparison, so that the resulting expression is fully normalized. This fixes PR9939. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131576 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-18More instcombine cleanup aimed towards improving debug line info.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131559 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-18Start trying to make InstCombine preserve more debug info. The idea here is ↵Eli Friedman
to set the debug location on the IRBuilder, which will be then right location in most cases. This should magically give many transformations debug locations, and fixing places which are missing a debug location will usually just means changing the code creating it to use the IRBuilder. As an example, the change to InstCombineCalls catches a common case where a call to a bitcast of a function is rewritten. Chris, does this approach look reasonable? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131516 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-17Drop lli, revise test.Stuart Hastings
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131452 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-16Don't do tail calls in a function that call setjmp. The stack might beRafael Espindola
corrupted when setjmp returns again. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131399 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-14Disable test harder.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131363 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-14Disable this test while I revise it. rdar://problem/9267970Stuart Hastings
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131350 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-14SimplifyCFG: Use ComputeMaskedBits to prune dead cases from switch instructions.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131345 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-14Avoid combining GEPs that might overflow at runtime.Stuart Hastings
rdar://problem/9267970 Patch by Julien Lerouge! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131339 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-07The comparision "max(x,y)==x" is equivalent to "x>=y". Since the max isDuncan Sands
often expressed as "x >= y ? x : y", there is a good chance we can extract the existing "x >= y" from it and use that as a replacement for "max(x,y)==x". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131049 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-06Move few target-dependant tests to appropriate directories.Galina Kistanova
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131002 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-06Fix PR9820: a read-only call differs from a load in that a load doesn'tDuncan Sands
return the pointer being dereferenced, it returns the pointee, but a call might return the pointer itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130979 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-05PR9838: Fix transform introduced in r127064 to not trigger when only one ↵Eli Friedman
side of the icmp is an exact shift. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130954 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-04Add variations on: max(x,y) >= min(x,z) folds to true. This isn't that common,Duncan Sands
but according to my super-optimizer there are only two missed simplifications of -instsimplify kind when compiling bzip2, and this is one of them. It amuses me to have bzip2 be perfectly optimized as far as instsimplify goes! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130840 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-03Implement some basic simplifications involving min/max, for exampleDuncan Sands
max(a,b) >= a -> true. According to my super-optimizer, these are by far the most common simplifications (of the -instsimplify kind) that occur in the testsuite and aren't caught by -std-compile-opts. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130780 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-02Fix PR9579: when simplifying a compare to "true" or "false", and it wasDuncan Sands
a vector compare, generate a vector result rather than i1 (and crashing). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130706 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-02Move some rem transforms out of instcombine and into instsimplify.Duncan Sands
This automagically provides a transform noticed by my super-optimizer as occurring quite often: "rem x, (select cond, x, 1)" -> 0. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130694 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-30InstCombine: Turn (zext A) udiv (zext B) into (zext (A udiv B)). Same for ↵Benjamin Kramer
urem or constant B. This obviously helps a lot if the division would be turned into a libcall (think i64 udiv on i386), but div is also one of the few remaining instructions on modern CPUs that become more expensive when the bitwidth gets bigger. This also helps register pressure on i386 when dividing chars, divb needs two 8-bit parts of a 16 bit register as input where divl uses two registers. int foo(unsigned char a) { return a/10; } int bar(unsigned char a, unsigned char b) { return a/b; } compiles into (x86_64) _foo: imull $205, %edi, %eax shrl $11, %eax ret _bar: movzbl %dil, %eax divb %sil, %al movzbl %al, %eax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130615 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-30Use SimplifyDemandedBits on div instructions.Benjamin Kramer
This folds away silly stuff like (a&255)/1000 -> 0. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130614 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-30FileCheckize.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130613 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-29SimplifyCFG: Expose phi node folding cost threshold as command line parameterPeter Collingbourne
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130528 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-29SimplifyCFG: Add CostRemaining parameter to DominatesMergePointPeter Collingbourne
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130527 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-29SimplifyCFG: Add Trunc, ZExt and SExt to the list of cheap instructions for ↵Peter Collingbourne
phi node folding git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130526 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-29InstCombine: turn (C1 << A) << C2) into (C1 << C2) << A)Benjamin Kramer
Fixes PR9809. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130485 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-28final step needed to resolve PR6627, which allows us to flatten the code down toChris Lattner
a nice and tidy: %x1 = load i32* %0, align 4 %1 = icmp eq i32 %x1, 1179403647 br i1 %1, label %if.then, label %if.end instead of doing lots of loads and branches. May the FreeBSD bootloader long fit in its allocated space. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130416 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-28InstCombine: Merge "(trunc x) == C1 & (and x, CA) == C2" into a single and+icmp.Benjamin Kramer
This happens when GVN widens loads. Part of PR6627. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130405 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-28teach GVN to widen integer loads when they are overaligned, when doing an Chris Lattner
wider load would allow elimination of subsequent loads, and when the wider load is still a native integer type. This eliminates a ton of loads on various benchmarks involving struct fields, though it is somewhat hobbled by clang not being very aggressive about field alignment. This is yet another step along the way towards resolving PR6627. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130390 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-27Fixes PR9730: indvars: An asserting value handle still pointed to this valueAndrew Trick
Modified LinearFunctionTestReplace to push the condition on the dead list instead of eagerly deleting it. This can cause unnecessary IV rewrites, which should have no effect on codegen and will not be an issue once we stop generating canonical IVs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130340 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-27Simplify cfg inserts a call to trap when unreachable code is detected. ↵Devang Patel
Assign DebugLoc to this new trap instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130315 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-26remove support for llvm.invariant.end from memdep. It is a Chris Lattner
work-in-progress that is not progressing, and it has issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130247 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-26make a couple of changes to the standard pass pipeline:Chris Lattner
1. Only run the early (in the module pass pipe) instcombine/simplifycfg if the "unit at a time" passes they are cleaning up after runs. 2. Move the "clean up after the unroller" pass to the very end of the function-level pass pipeline. Loop unroll uses instsimplify now, so it doesn't create a ton of trash. Moving instcombine later allows it to clean up after opportunities are exposed by GVN, DSE, etc. 3. Introduce some phase ordering tests for things that are specifically intended to be simplified by the full optimizer as a whole. This resolves PR2338, and is progress towards PR6627, which will be generating code that looks similar to test2. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130241 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-26Transform: "icmp eq (trunc (lshr(X, cst1)), cst" to "icmp (and X, mask), cst"Chris Lattner
when X has multiple uses. This is useful for exposing secondary optimizations, but the X86 backend isn't ready for this when X has a single use. For example, this can disable load folding. This is inching towards resolving PR6627. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130238 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-26Improve the bail-out predicate to really only kick in when phiChris Lattner
translation fails. We were bailing out in some cases that would cause us to miss GVN'ing some non-local cases away. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130206 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-26Enhance MemDep: When alias analysis returns a partial alias result,Chris Lattner
return it as a clobber. This allows GVN to do smart things. Enhance GVN to be smart about the case when a small load is clobbered by a larger overlapping load. In this case, forward the value. This allows us to compile stuff like this: int test(void *P) { int tmp = *(unsigned int*)P; return tmp+*((unsigned char*)P+1); } into: _test: ## @test movl (%rdi), %ecx movzbl %ch, %eax addl %ecx, %eax ret which has one load. We already handled the case where the smaller load was from a must-aliased base pointer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130180 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-20Fix another case of <rdar://problem/9184212> that only occurs with codeCameron Zwarich
generated by llvm-gcc, since llvm-gcc uses 2 i64s for passing a 4 x float vector on ARM rather than an i64 array like Clang. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129878 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-16Add test cases for Jay's r129641 and fix a 32-bit-centric testcase in a file ↵Frits van Bommel
with a 64-bit datalayout. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129643 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-15Fix a ton of comment typos found by codespell. Patch byChris Lattner
Luis Felipe Strano Moraes! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129558 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-14Add an instcombine for constructs like a | -(b != c); a select is moreEli Friedman
canonical, and generally leads to better code. Found while looking at an article about saturating arithmetic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129545 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-14Fix an infinite alternation in JumpThreading where two transforms would ↵Owen Anderson
repeatedly undo each other. The solution is to perform more aggressive constant folding to make one of the edges just folded away rather than trying to thread it. Fixes <rdar://problem/9284786>. Discovered with CSmith. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129538 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-13Vectors with different number of elements of the same element type can haveMon P Wang
the same allocation size but different primitive sizes(e.g., <3xi32> and <4xi32>). When ScalarRepl promotes them, it can't use a bit cast but should use a shuffle vector instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129472 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-12Fix reassociate to use a worklist instead of recursing when newDan Gohman
reassociation opportunities are exposed. This fixes a bug where the nested reassociation expects to be the IR to be consistent, but it isn't, because the outer reassociation has disconnected some of the operands. rdar://9167457 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129324 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-11remove the StructRetPromotion pass. It is unused, not maintained andChris Lattner
has some bugs. If this is interesting functionality, it should be reimplemented in the argpromotion pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129314 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-09Add back a couple checks removed by r129128; the fact that an intitializerEli Friedman
is an array of structures doesn't imply it's a ConstantArray of ConstantStruct. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129207 91177308-0d34-0410-b5e6-96231b3b80d8
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