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2011-03-20Change an argument to a LiveInterval instead of a register number to save ↵Jakob Stoklund Olesen
some redundant lookups. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127964 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19Replace a broken LiveInterval::MergeValueInAsValue() with something simpler.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127960 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19Add debug output.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127959 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19Minor code re-structuring.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127952 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19Add support for legalizing UINT_TO_FP of vectors on platforms which doNadav Rotem
not have native support for this operation (such as X86). The legalized code uses two vector INT_TO_FP operations and is faster than scalarizing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127951 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19Reapply 127939 since Daniel fixed the breakage. <rdar://problem/9012638>Stuart Hastings
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127944 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19Revert 127939. <rdar://problem/9012638>Stuart Hastings
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127943 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19Revise r126127 to address Daniel's comments. <rdar://problem/9012638>Stuart Hastings
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127939 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18Beginnings of MC-JIT code generation.Jim Grosbach
Proof-of-concept code that code-gens a module to an in-memory MachO object. This will be hooked up to a run-time dynamic linker library (see: llvm-rtdyld for similarly conceptual work for that part) which will take the compiled object and link it together with the rest of the system, providing back to the JIT a table of available symbols which will be used to respond to the getPointerTo*() queries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127916 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18Extend live debug values down the dominator tree by following copies.Jakob Stoklund Olesen
The llvm.dbg.value intrinsic refers to SSA values, not virtual registers, so we should be able to extend the range of a value by tracking that value through register copies. This greatly improves the debug value tracking for function arguments that for some reason are copied to a second virtual register at the end of the entry block. We only extend the debug value range where its register is killed. All original llvm.dbg.value locations are still respected. Copies from physical registers are ignored. That should not be a problem since the entry block already adds DBG_VALUE instructions for the virtual registers holding the function arguments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127912 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18Hoist spills when the same value is known to be in less loopy sibling registers.Jakob Stoklund Olesen
Stack slot real estate is virtually free compared to registers, so it is advantageous to spill earlier even though the same value is now kept in both a register and a stack slot. Also eliminate redundant spills by extending the stack slot live range underneath reloaded registers. This can trigger a dead code elimination, removing copies and even reloads that were only feeding spills. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127868 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18Accept instructions that read undefined values.Jakob Stoklund Olesen
This is not supposed to happen, but I have seen the x86 rematter getting confused when rematerializing partial redefs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127857 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18Be more accurate about the slot index reading a register when dealing with defsJakob Stoklund Olesen
and early clobbers. Assert when trying to find an undefined value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127856 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17BuildUDIV: If the divisor is even we can simplify the fixup of the ↵Benjamin Kramer
multiplied value by introducing an early shift. This allows us to compile "unsigned foo(unsigned x) { return x/28; }" into shrl $2, %edi imulq $613566757, %rdi, %rax shrq $32, %rax ret instead of movl %edi, %eax imulq $613566757, %rax, %rcx shrq $32, %rcx subl %ecx, %eax shrl %eax addl %ecx, %eax shrl $4, %eax on x86_64 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127829 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17Dead code elimination may separate the live interval into multiple connected ↵Jakob Stoklund Olesen
components. I have convinced myself that it can only happen when a phi value dies. When it happens, allocate new virtual registers for the components. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127827 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17Move more logic into getTypeForExtArgOrReturn.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127809 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17Rename getTypeForExtendedInteger() to getTypeForExtArgOrReturn().Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127807 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17Rewrite instructions as part of ConnectedVNInfoEqClasses::Distribute.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127779 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Add a LiveRangeEdit delegate callback before shrinking a live range.Jakob Stoklund Olesen
The register allocator needs to adjust its live interval unions when that happens. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127774 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Erase virtual registers that are unused after DCE.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127773 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Tag cached interference with a user-provided tag instead of the virtual ↵Jakob Stoklund Olesen
register number. The live range of a virtual register may change which invalidates the cached interference information. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127772 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Clarify debugging output.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127771 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16The x86-64 ABI says that a bool is only guaranteed to be sign-extended to a byteCameron Zwarich
rather than an int. Thankfully, this only causes LLVM to miss optimizations, not generate incorrect code. This just fixes the zext at the return. We still insert an i32 ZextAssert when reading a function's arguments, but it is followed by a truncate and another i8 ZextAssert so it is not optimized. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127766 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Don't recompute something that we already have in a local variable.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127764 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Revert r127757, "Patch to a fix dwarf relocation problem on ARM. One-line fixDaniel Dunbar
plus the test where it used to break.", which broke Clang self-host of a Debug+Asserts compiler, on OS X. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127763 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Patch to a fix dwarf relocation problem on ARM. One-line fix plus the test ↵Renato Golin
where it used to break. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127757 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15Trace back through sibling copies to hoist spills and find rematerializable ↵Jakob Stoklund Olesen
defs. After live range splitting, an original value may be available in multiple registers. Tracing back through the registers containing the same value, find the best place to insert a spill, determine if the value has already been spilled, or discover a reaching def that may be rematerialized. This is only the analysis part. The information is not used for anything yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127698 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15Preserve both isPHIDef and isDefByCopy bits when copying parent values.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127697 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15Add a peephole optimization to optimize pairs of bitcasts. e.g.Evan Cheng
v2 = bitcast v1 ... v3 = bitcast v2 ... = v3 => v2 = bitcast v1 ... = v1 if v1 and v3 are of in the same register class. bitcast between i32 and fp (and others) are often not nops since they are in different register classes. These bitcast instructions are often left because they are in different basic blocks and cannot be eliminated by dag combine. rdar://9104514 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127668 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15sext(undef) = 0, because the top bits will all be the same.Evan Cheng
zext(undef) = 0, because the top bits will be zero. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127649 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15There are some situations which can cause the URoR hack to infinitely recurseBill Wendling
and then go kablooie. The problem was that it was tracking the PHI nodes anew each time into this function. But it didn't need to. And because the recursion didn't know that a PHINode was visited before, it would go ahead and call itself. There is a testcase, but unfortunately it's too big to add. This problem will go away with the EH rewrite. <rdar://problem/8856298> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127640 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14Place context in member variables instead of passing around pointers.Jakob Stoklund Olesen
Use the opportunity to get rid of the trailing underscore variable names. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127618 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14Rename members to match LLVM naming conventions more closely.Jakob Stoklund Olesen
Remove the unused reserved_ bit vector, no functional change intended. This doesn't break 'svn blame', this file really is all my fault. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127607 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14BIT_CONVERT has been renamed to BITCAST.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127600 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14Minor optimization. sign-ext/anyext of undef is still undef.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127598 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-13Now that we are deleting unused live intervals during allocation, pointers ↵Jakob Stoklund Olesen
may be reused. Use the virtual register number as a cache tag instead. They are not reused. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127561 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-13Tell the register allocator about new unused virtual registers.Jakob Stoklund Olesen
This allows the allocator to free any resources used by the virtual register, including physical register assignments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127560 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-12Speculatively revert commit 127478 (jsjodin) in an attempt to fix theDuncan Sands
llvm-gcc-i386-linux-selfhost and llvm-x86_64-linux-checks buildbots. The original log entry: Remove optimization emitting a reference insted of label difference, since it can create more relocations. Removed isBaseAddressKnownZero method, because it is no longer used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127540 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-12Include snippets in the live stack interval.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127530 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-12Spill multiple registers at once.Jakob Stoklund Olesen
Live range splitting can create a number of small live ranges containing only a single real use. Spill these small live ranges along with the large range they are connected to with copies. This enables memory operand folding and maximizes the spill to fill distance. Work in progress with known bugs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127529 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-12That's it, I am declaring this a failure of the C++03 STL.Jakob Stoklund Olesen
There are too many compatibility problems with using mixed types in std::upper_bound, and I don't want to spend 110 lines of boilerplate setting up a call to a 10-line function. Binary search is not /that/ hard to implement correctly. I tried terminating the binary search with a linear search, but that actually made the algorithm slower against my expectation. Most live intervals have less than 4 segments. The early test against endIndex() does pay, and this version is 25% faster than plain std::upper_bound(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127522 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Fix the GCC test suite issue exposed by r127477, which was caused by stackCameron Zwarich
protector insertion not working correctly with unreachable code. Since that revision was rolled out, this test doesn't actual fail before this fix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127497 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Teach FastISel to support register-immediate-immediate instructions.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127496 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Remove optimization emitting a reference insted of label difference, since ↵Jan Sjödin
it can create more relocations. Removed isBaseAddressKnownZero method, because it is no longer used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127478 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Replace -dag-chain-limit flag with constant. It has survived a release cycle ↵Andrew Trick
without being touched, so no longer needs to pollute the hidden-help text. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127468 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Fix use of CompEnd predicate to be standards conformingJohn Wiegley
The existing CompEnd predicate does not define a strict weak order as required by the C++03 standard; therefore, its use as a predicate to std::upper_bound is invalid. For a discussion of this issue, see http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#270 This patch replaces the asymmetrical comparison with an iterator adaptor that achieves the same effect while being strictly standard-conforming by ensuring an apples-to-apples comparison. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127462 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Avoid replacing the value of a directly stored load with the stored value if ↵Evan Cheng
the load is indexed. rdar://9117613. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127440 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-10Add an option to disable critical edge splitting in PHIElimination.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127398 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-10Change the Spiller interface to take a LiveRangeEdit reference.Jakob Stoklund Olesen
This makes it possible to register delegates and get callbacks when the spiller edits live ranges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127389 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-10Make SpillIs an optional pointer. Avoid creating a bunch of temporary ↵Jakob Stoklund Olesen
SmallVectors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127388 91177308-0d34-0410-b5e6-96231b3b80d8
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