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occured in a pattern, but failed miserably. The new code works for
any instruction that has a store in its pattern, including all the
x86 mem op mem instructions.
The only target-independent code that uses this is branch folding,
so this won't change anything in practice.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45648 91177308-0d34-0410-b5e6-96231b3b80d8
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instr, but don't do so yet.
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getName() accessor.
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out, DAGISelEmitter can compute it in its ctor, which simplifies some code.
Now we can use CodegenDAGPatterns in other parts of tblgen that want access
to dag pattern info, woo!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45636 91177308-0d34-0410-b5e6-96231b3b80d8
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The only difference in output is that we now print them in alphabetical
order instead of reverse alphabetical order.
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Split the pattern parsing code out from the dag isel emitter into it's own file.
No functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45632 91177308-0d34-0410-b5e6-96231b3b80d8
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the target independent legalizer.
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Don't overwrite a variable used by the fallthrough code path in this
case.
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unifying the copied algorithms and saving over 500 LOC. There should
be no functionality change, but please test on your favorite x86
target.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45627 91177308-0d34-0410-b5e6-96231b3b80d8
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checking that there was a from a global instead of a load from the stub
for a global, which is the one that's safe to hoist.
Consider this program:
volatile char G[100];
int B(char *F, int N) {
for (; N > 0; --N)
F[N] = G[N];
}
In static mode, we shouldn't be hoisting the load from G:
$ llc -relocation-model=static -o - a.bc -march=x86 -machine-licm
LBB1_1: # bb.preheader
leal -1(%eax), %edx
testl %edx, %edx
movl $1, %edx
cmovns %eax, %edx
xorl %esi, %esi
LBB1_2: # bb
movb _G(%eax), %bl
movb %bl, (%ecx,%eax)
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made better.
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this
for remat, but can't due to an RA bug.
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isReallySideEffectFree and isReallyTriviallyReMaterializable. Why is a load from
a global considered side-effect-free but not rematable?
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sinks almost nothing.
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things that are not equality comparisons, for example:
(2147479553+4096)-2147479553 < 0 != (2147479553+4096) < 2147479553
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moved if needed.
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preserved.
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since they didn't actually need to be bitfields,
though they are marked as such).
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