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Use larger write sizes for MCFillFragment.

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This brings the pr26208 testcase down to 3.2 seconds. Not checking it in
since it does create a 4GB .o file.

llvm-svn: 258149
This commit is contained in:
Rafael Espindola 2016-01-19 17:47:48 +00:00
parent 40581de42f
commit a9f441b419
1 changed files with 13 additions and 2 deletions
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15
lib/MC/MCAssembler.cpp
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@ -488,9 +488,20 @@ static void writeFragment(const MCAssembler &Asm, const MCAsmLayout &Layout,
case MCFragment::FT_Fill: {
++stats::EmittedFillFragments;
const MCFillFragment &FF = cast<MCFillFragment>(F);
uint8_t V = FF.getValue();
const unsigned MaxChunkSize = 16;
char Data[MaxChunkSize];
memcpy(Data, &V, 1);
for (unsigned I = 1; I < MaxChunkSize; ++I)
Data[I] = Data[0];
for (uint64_t I = 0, E = FF.getSize(); I != E; ++I)
OW->write8(FF.getValue());
uint64_t Size = FF.getSize();
for (unsigned ChunkSize = MaxChunkSize; ChunkSize; ChunkSize /= 2) {
StringRef Ref(Data, ChunkSize);
for (uint64_t I = 0, E = Size / ChunkSize; I != E; ++I)
OW->writeBytes(Ref);
Size = Size % ChunkSize;
}
break;
}