This code has been turned off for the last decade. Considering 3Dnow is obsolete it seems the bug will never be fixed so just remove it.
a3218e6 mesa: remove long dead 3Dnow optimisation
src/mesa/Makefile.sources | 1 -
src/mesa/x86/3dnow.c | 7 -
src/mesa/x86/3dnow_normal.S | 852 -------------------------------------------
3 files changed, 860 deletions(-)
Upstream: cgit.freedesktop.org