Attached patches add documentation for -mfract-convert-truncate option
and add that info to release notes (gcc-4.9 changes).
If OK, could someone commit please? I do not have commit access.
Regards,
Pitchumani
gcc/ChangeLog
2016-06-21 Pitchumani Sivanupandi <pitchuman...@atmel.com>
PR target/58655
* doc/invoke.texi (AVR Options): Document -mfract-convert-truncate
option.
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -643,8 +643,8 @@ Objective-C and Objective-C++ Dialects}.
@emph{AVR Options}
@gccoptlist{-mmcu=@var{mcu} -maccumulate-args -mbranch-cost=@var{cost} @gol
-mcall-prologues -mint8 -mn_flash=@var{size} -mno-interrupts @gol
--mrelax -mrmw -mstrict-X -mtiny-stack -nodevicelib -Waddr-space-convert @gol
--Wmisspelled-isr}
+-mrelax -mrmw -mstrict-X -mtiny-stack -mfract-convert-truncate -nodevicelib @gol
+-Waddr-space-convert -Wmisspelled-isr}
@emph{Blackfin Options}
@gccoptlist{-mcpu=@var{cpu}@r{[}-@var{sirevision}@r{]} @gol
@@ -14586,6 +14586,10 @@ sbiw r26, const ; X -= const
@opindex mtiny-stack
Only change the lower 8@tie{}bits of the stack pointer.
+@item -mfract-convert-truncate
+@opindex mfract-convert-truncate
+Allow to use truncation instead of rounding towards 0 for fractional int types.
+
@item -nodevicelib
@opindex nodevicelib
Don't link against AVR-LibC's device specific library @code{lib<mcu>.a}.
--- a/wwwdocs/htdocs/gcc-4.9/changes.html
+++ b/wwwdocs/htdocs/gcc-4.9/changes.html
@@ -579,6 +579,14 @@ auto incr(T x) { return x++; }
size when compiling for the M-profile processors.
</li>
</ul>
+<h3 id="avr">AVR</h3>
+<ul>
+ <li>
+ A new command-line option -mfract-convert-truncate has been added.
+ It allows compiler to use truncation instead of rounding towards
+ 0 for fractional int types.
+ </li>
+</ul>
<h3 id="x86">IA-32/x86-64</h3>
<ul>
<li><code>-mfpmath=sse</code> is now implied by <code>-ffast-math</code>
