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Add fast path for raw_ostream output of strings.
- Particularly nice for small constant strings, which get optimized down nicely. On a synthetic benchmark writing out "hello" in a loop, this is about 2x faster with gcc and 3x faster with llvm-gcc. llc on insn-attrtab.bc from 403.gcc is about .5% faster. - I tried for a fancier solution which wouldn't increase code size as much (by trying to match constant arrays), but can't quite make it fly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68396 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -119,7 +119,17 @@ public:
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}
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raw_ostream &operator<<(const char *Str) {
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write(Str, strlen(Str));
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// Inline fast path, particulary for constant strings where a
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// sufficiently smart compiler will simplify strlen.
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unsigned Size = strlen(Str);
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// Make sure we can use the fast path.
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if (OutBufCur+Size > OutBufEnd)
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return write(Str, Size);
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memcpy(OutBufCur, Str, Size);
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OutBufCur += Size;
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return *this;
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}
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