http://llvm.org/bugs/show_bug.cgi?id=3206
Summary: lack of select use (cmov)
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
On i386-apple-darwin, built with "llvmc -O3 -S select_reduced.c" with or
without -clang. At the end of each case should be a select/cmov.
inline __attribute__((always_inline))
unsigned short _OSSwapInt16(unsigned short _data)
{
return ((_data << 8) | (_data >> 8));
}
inline __attribute__((always_inline))
unsigned short ReadSwapShort(unsigned char* data, unsigned int offset)
{
return _OSSwapInt16(*(unsigned short*) &data[offset]);
}
unsigned short* myfunc(unsigned short* endCodes, unsigned short probe, unsigned
short entrySelector, unsigned short c)
{
#define PROBE_SHIFT \
{\
probe >>= 1;\
if (c > _OSSwapInt16(endCodes[probe >> 1]))\
endCodes = &endCodes[probe >> 1];\
}
switch (entrySelector)
{
case 15: PROBE_SHIFT; // FALL-THRU
case 14: PROBE_SHIFT; // FALL-THRU
case 13: PROBE_SHIFT; // FALL-THRU
case 12: PROBE_SHIFT; // FALL-THRU
case 11: PROBE_SHIFT; // FALL-THRU
case 10: PROBE_SHIFT; // FALL-THRU
case 9: PROBE_SHIFT; // FALL-THRU
case 8: PROBE_SHIFT; // FALL-THRU
case 7: PROBE_SHIFT; // FALL-THRU
case 6: PROBE_SHIFT; // FALL-THRU
case 5: PROBE_SHIFT; // FALL-THRU
case 4: PROBE_SHIFT; // FALL-THRU
}
return endCodes;
}
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