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| author | Joerg Sonnenberger <joerg@bec.de> | 2011-12-12 20:18:31 +0000 |
|---|---|---|
| committer | Joerg Sonnenberger <joerg@bec.de> | 2011-12-12 20:18:31 +0000 |
| commit | 127a669d09e21ddcd525f493c19dc399093bef35 (patch) | |
| tree | 07a16d55d282531b1a1954a39877b486070d58d8 /lib | |
| parent | 4ab406d7fc06b1272d02cd8be46f0c5ebe51a3da (diff) | |
| download | llvm-127a669d09e21ddcd525f493c19dc399093bef35.tar.gz llvm-127a669d09e21ddcd525f493c19dc399093bef35.tar.bz2 llvm-127a669d09e21ddcd525f493c19dc399093bef35.tar.xz | |
Only replace fwrite with fputc, if the return value is unused.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146411 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/SimplifyLibCalls.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp index 075adc0187..f3184ecc86 100644 --- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp +++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp @@ -1293,7 +1293,8 @@ struct FWriteOpt : public LibCallOptimization { return ConstantInt::get(CI->getType(), 0); // If this is writing one byte, turn it into fputc. - if (Bytes == 1) { // fwrite(S,1,1,F) -> fputc(S[0],F) + // This optimisation is only valid, if the return value is unused. + if (Bytes == 1 && CI->use_empty()) { // fwrite(S,1,1,F) -> fputc(S[0],F) Value *Char = B.CreateLoad(CastToCStr(CI->getArgOperand(0), B), "char"); EmitFPutC(Char, CI->getArgOperand(3), B, TD); return ConstantInt::get(CI->getType(), 1); |