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Description
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I believe that I have found a minor bug in the framesize calculation in chaitin.cpp:
// Convert that to a frame_slot number.
if( _max_reg <= _matcher._new_SP )
_framesize = C->out_preserve_stack_slots();
else _framesize = _max_reg -_matcher._new_SP;
assert((int)(_matcher._new_SP+_framesize) >= (int)_matcher._out_arg_limit, "framesize must be large enough");
// This frame must preserve the required fp alignment
const int stack_alignment_in_words = Matcher::stack_alignment_in_slots();
if (stack_alignment_in_words > 0)
_framesize = round_to(_framesize, Matcher::stack_alignment_in_bytes());
assert( _framesize >= 0 && _framesize <= 1000000, "sanity check" );
The granularity of _framesize at this point is OptoReg slots and so should it be aligned to Matcher::stack_alignment_in_slots() instead of Matcher::stack_alignment_in_bytes()? This is causing the minimum framesize on Itanium to be 80 bytes instead of 32 (2 words scratch, 1 word for the original_pc offset, and 1 word for alignment).
Posted Date : 2008-10-20 22:00:03.0
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