https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66594
Bug ID: 66594
Summary: jitted code should use -mtune=native
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: jit
Assignee: dmalcolm at gcc dot gnu.org
Reporter: dmalcolm at gcc dot gnu.org
Target Milestone: ---
We should probably default to -mtune=native when building code in-memory (but
probably to -mtune=generic when compiling to disk?). Perhaps an option, or
maybe expose these options directly?
Note to self:
* I see in gcc.c:
/* As special support for cross compilers we read -mtune=native
as -mtune=generic. With native compilers we won't see the
-mtune=native, as it was changed by the driver. */
if (!strcmp (opts->x_ix86_tune_string, "native"))
{
opts->x_ix86_tune_string = "generic";
}
hence we need to somehow run the *driver* logic for -mtune=native.
Note that that logic can be a no-op under non-bootstrapped builds; see bug
66593.
