[Bug target/49313] New: Inefficient libgcc implementations for avr
gjl at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Tue Jun 7 17:28:00 GMT 2011
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49313
Summary: Inefficient libgcc implementations for avr
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: gjl@gcc.gnu.org
Target: avr
Currently, many support functions in libgcc are not tuned resp. not implemented
in assembler in libgcc.S in avr BE and thus the lengthy, open coded C-versions
are used.
Amongst these functions are:
For mode in hi, si, di:
__ctz<mode>2
__clz<mode>2
__ffs<mode>2
__parity<mode>2
__popcount<mode>2
For mode in si, di:
__bswap<mode>2
For DImode there are arithmetic functions like
__muldi3, __[u]divdi3, __[u]moddi3.
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