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Address undefined warnings from compilers for left shifting negative integers in zpaq.
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ckolivas 2026-02-13 12:07:24 +11:00
parent 1ea9a2b3ed
commit 843fa4168a
1 changed files with 5 additions and 1 deletions
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6
libzpaq/libzpaq.cpp
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@ -801,7 +801,11 @@ void Predictor::init() {
cr.cm.resize(512);
for (int j=0; j<256; ++j) {
cr.cm[j*2]=1<<15;
cr.cm[j*2+1]=clamp512k(stretch(st.cminit(j)>>8)<<10);
// Left shift of negative values is undefined strictly speaking so
// cast it back and forth to safely perform left shift and avoid
// compiler issues. Original code:
// cr.cm[j*2+1]=clamp512k(stretch(st.cminit(j)>>8)<<10);
cr.cm[j*2+1]=clamp512k(static_cast<int>(static_cast<unsigned int>(stretch(st.cminit(j) >> 8)) << 10));
}
break;
case SSE: // sizebits j start limit