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Mention -march-native, #2289.

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Wilson Snyder 2020-04-29 18:10:43 -04:00
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@ -2071,18 +2071,18 @@ OPT, OPT_FAST, or OPT_SLOW lib/verilated.mk. Or, use the -CFLAGS and/or
the compiler or linker. Or, just for one run, pass them on the command
line to make:
make OPT_FAST="-Os -fno-stack-protector" -f Vour.mk Vour__ALL.a
make OPT_FAST="-Os -march=native -fno-stack-protector" -f Vour.mk Vour__ALL.a
OPT_FAST specifies optimizations for those programs that are part of the
fast path, mostly code that is executed every cycle. OPT_SLOW specifies
optimizations for slow-path files (plus tracing), which execute only
rarely, yet take a long time to compile with optimization on. OPT
specifies overall optimization and affects all compiles, including those
OPT_FAST and OPT_SLOW control. For best results, use OPT="-Os", and link
with "-static". Nearly the same results can be had with much better
compile times with OPT_FAST="-O1 -fstrict-aliasing". Higher optimization
such as "-O2" or "-O3" may help, but gcc compile times may be excessive
under O3 on even medium sized designs.
OPT_FAST and OPT_SLOW control. For best results, use OPT="-Os
-march=native", and link with "-static". Nearly the same results can be
had with much better compile times with OPT_FAST="-O1 -fstrict-aliasing".
Higher optimization such as "-O2" or "-O3" may help, but gcc compile times
may be excessive under O3 on even medium sized designs.
Unfortunately, using the optimizer with SystemC files can result in
compiles taking several minutes. (The SystemC libraries have many little