On 02/18/2016 08:39 PM, Martin Sebor wrote:
Ping:
https://gcc.gnu.org/ml/gcc-patches/2016-02/msg00809.html
On 02/11/2016 02:58 PM, Martin Sebor wrote:
The more than decennnial rtl-optimization/19705 - -fno-branch-count-reg
doesn't prevent decrement and branch instructions on a count register
points out that the documentation of the option leads one to expect
that it prevents the decrement and branch instruction from appearing
in the instruction stream. This isn't the case The option prevents
a dedicated pass from running that introduces such instructions, but
it doesn't prevent other passes from introducing it. The attached
updates the documentation to clarify this
I'm not even sure why we have this option to begin with. One could
easily argue that it's mis-named or should just go away.
In the mean time, your patch at least clarifies what it really does, so
it's fine for the trunk.
jeff
