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Re-add strcmp and known size object size checking optimization.

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Passed bootstrap and nightly test run here.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95145 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2010-02-02 22:10:43 +00:00
parent 7f89fdae34
commit a6a089cd24
4 changed files with 82 additions and 11 deletions
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9
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@ -1213,8 +1213,13 @@ struct StrCpyChkOpt : public LibCallOptimization {
if (!SizeCI)
return 0;
// We don't have any length information, just lower to a plain strcpy.
if (SizeCI->isAllOnesValue())
// If a) we don't have any length information, or b) we know this will
// fit then just lower to a plain strcpy. Otherwise we'll keep our
// strcpy_chk call which may fail at runtime if the size is too long.
// TODO: It might be nice to get a maximum length out of the possible
// string lengths for varying.
if (SizeCI->isAllOnesValue() ||
SizeCI->getZExtValue() >= GetStringLength(CI->getOperand(2)))
return EmitStrCpy(CI->getOperand(1), CI->getOperand(2), B);
return 0;