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This patch provides libm on i386 with an extra set of libm routines using SSE register calling conventions for float and double arguments. This is useful together with GCC emitting calls to these functions if compiling for an SSE2 machine with SSE math turned on (-fpmath=sse). It hereby avoids costly moves between SSE registers and the i387 FP stack. Of course the actual SSE implementation of the routines is lame at the moment (just compile the generic ieee754 stuff with -fpmath=sse), but libimf shipped with the Intel compiler shows you can get quite a runtime speedup with proper implementations. The patch depends on the gcc patch also provided here by reference and is for general commenting only as if you like me to rather push this into some internal gcc place like libgcc. Thanks, Richard.
Attachment:
patch-libc-sselibm
Description: Text document
Attachment:
msseregparm
Description: gcc patch
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