Speed up SCCP substantially by processing overdefined values quickly. This
patch speeds up SCCP by about 30-40% on large testcases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14861 91177308-0d34-0410-b5e6-96231b3b80d8
This version takes about 1s longer than the previous one (down to 2.35s),
but on the positive side, it actually works :)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14856 91177308-0d34-0410-b5e6-96231b3b80d8
This eliminates an N*N*logN algorithm from the loop simplify pass, replacing
it with a much simpler and faster alternative. In a debug build, this reduces
gccas time on eon from 85s to 42s.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14851 91177308-0d34-0410-b5e6-96231b3b80d8
null, uint 1) to uint)' to a constant integer. We can only do this with
primitive LLVM types, because other types have target-specific sizes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14837 91177308-0d34-0410-b5e6-96231b3b80d8
this LLVM function:
int %foo() {
ret int cast (int** getelementptr (int** null, int 1) to int)
}
into:
foo:
mov %EAX, 0
lea %EAX, DWORD PTR [%EAX + 4]
ret
now we compile it into:
foo:
mov %EAX, 4
ret
This sequence is frequently generated by the MSIL front-end, and soon the malloc lowering pass and
Java front-ends as well..
-Chris
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14834 91177308-0d34-0410-b5e6-96231b3b80d8
* Simplify a lot of code because type's cannot be in function symbol tables
* Fix memory leaks in handling of redefined function prototypes
* Don't use SymbolTable directly for stuff that we can go through the Module
for.
* Fix some minor bugs on obscure testcases like:
test/Feature/globalredefinition.ll
* Do not create GlobalVariable objects for forward referenced Functions!
* When forward referencing a function in a constant expression, do not create
a placeholder, add a bunch of references to it, then turn around and
replaceAllUsesOfWith on it with a new global, deleting the placeholder.
Instead, when we find the real definition of the global, just use the
placeholder instead of creating a new object.
This substantially simplifies the asmwriter and should even speed it up on
cases heavy in constantexprs (like C++, Java, MSIL)...
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14830 91177308-0d34-0410-b5e6-96231b3b80d8
replaceAllUsesWith'ing any forward references, just use the forward
reference if it exists.
This introduces GetForwardRefForGlobal, which will eventually completely
replace the horrible DeclareNewGlobalValue function.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14828 91177308-0d34-0410-b5e6-96231b3b80d8
to substantially simplify the result. In particular, we no longer create
GlobalVariables and then immediately destroy them when they are duplciate
definitions.
The real point of this patch though is that it gets us closer to the
DeclareNewGlobalValue calls...
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14827 91177308-0d34-0410-b5e6-96231b3b80d8
This gives us only a single call site for setValueNameMergingDuplicates.
The next stage is the start merging them together.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14811 91177308-0d34-0410-b5e6-96231b3b80d8
Since the stupid '%X = const int 4' thing is gone, we can now simplify
setValueNameMergingDuplicates a bit more.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14810 91177308-0d34-0410-b5e6-96231b3b80d8
for a basic block, use it when the block is defined instead of deleting it
and creating a new one. Also, only create at most ONE forward reference
for any block, instead of one for each forward reference.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14807 91177308-0d34-0410-b5e6-96231b3b80d8
forward reference blocks if they have been created (instead of creating a new
block, replaceAllUsesOfWith, then nuking the placeholder). This is not yet
implemented.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14791 91177308-0d34-0410-b5e6-96231b3b80d8
just to keep track of some per-object state! Gaah! Whoever wrote this stuff...
oh wait, that would be me. Never mind.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14790 91177308-0d34-0410-b5e6-96231b3b80d8
the funciton symbol table to check for conflicts instead of having to
keep a shadow named LocalSymtab. Totally eliminate LocalSymtab. Verified
that this did not cause a regression on the testcase for PR107.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14788 91177308-0d34-0410-b5e6-96231b3b80d8
1. Split setValueName into two separate functions, one that is only used
at function scope and doesn't have to deal with duplicates, and one
that can be used either at global or function scope but that does deal
with conflicts. Conflicts were only in there because of the crappy old
CFE and probably should be entirely eliminated.
2. Insert BasicBlock's into the parent functions when they are created
instead of when they are complete. This effects name lookup (for the
better), which will be exploited in the next patch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14787 91177308-0d34-0410-b5e6-96231b3b80d8
