[Qemu-devel] [PATCH 2/3] host-utils: Improve mulu64 and muls64

2013-02-16 Thread Richard Henderson
The new formulation makes better use of add-with-carry type insns that the host may have. Use gcc's sign adjustment trick to avoid having to perform a 128-bit negation. Signed-off-by: Richard Henderson --- util/host-utils.c | 92 +++ 1 file ch

[Qemu-devel] [PATCH 2/3] host-utils: Improve mulu64 and muls64

2013-01-28 Thread Richard Henderson
The new formulation makes better use of add-with-carry type insns that the host may have. Use gcc's sign adjustment trick to avoid having to perform a 128-bit negation. Signed-off-by: Richard Henderson --- util/host-utils.c | 92 +++ 1 file ch