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| author | Kaushik Phatak <kaushik.phatak@kpit.com> | 2016-05-09 11:44:58 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@gcc.gnu.org> | 2016-05-09 11:44:58 +0000 |
| commit | 035b8879acaccdbf52d24730fe241e97d660d53d (patch) | |
| tree | 4a83a2d6833b91c14aa8edc0efbc99d40e6145af /gcc/doc | |
| parent | 18caa34eb299b8ea583088ce4bbf32cdc37676ff (diff) | |
| download | gcc-035b8879acaccdbf52d24730fe241e97d660d53d.zip gcc-035b8879acaccdbf52d24730fe241e97d660d53d.tar.gz gcc-035b8879acaccdbf52d24730fe241e97d660d53d.tar.bz2 | |
rl78.c (rl78_expand_prologue): Save the MDUC related registers in all interrupt handlers if necessary.
* config/rl78/rl78.c (rl78_expand_prologue): Save the MDUC related
registers in all interrupt handlers if necessary.
(rl78_option_override): Add warning.
(MUST_SAVE_MDUC_REGISTERS): New macro.
(rl78_expand_epilogue): Restore the MDUC registers if necessary.
* config/rl78/rl78.c (check_mduc_usage): New function.
(mduc_regs): New structure to hold MDUC register data.
* config/rl78/rl78.md (is_g13_muldiv_insn): New attribute.
(mulsi3_g13): Add is_g13_muldiv_insn attribute.
(udivmodsi4_g13): Add is_g13_muldiv_insn attribute.
(mulhi3_g13): Add is_g13_muldiv_insn attribute.
* config/rl78/rl78.opt (msave-mduc-in-interrupts): New option.
* doc/invoke.texi (RL78 Options): Add -msave-mduc-in-interrupts.
From-SVN: r236027
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 0554249..908dbe8 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -947,7 +947,7 @@ See RS/6000 and PowerPC Options. @emph{RL78 Options} @gccoptlist{-msim -mmul=none -mmul=g13 -mmul=g14 -mallregs @gol -mcpu=g10 -mcpu=g13 -mcpu=g14 -mg10 -mg13 -mg14 @gol --m64bit-doubles -m32bit-doubles} +-m64bit-doubles -m32bit-doubles -msave-mduc-in-interrupts} @emph{RS/6000 and PowerPC Options} @gccoptlist{-mcpu=@var{cpu-type} @gol @@ -19783,6 +19783,20 @@ Make the @code{double} data type be 64 bits (@option{-m64bit-doubles}) or 32 bits (@option{-m32bit-doubles}) in size. The default is @option{-m32bit-doubles}. +@item -msave-mduc-in-interrupts +@item -mno-save-mduc-in-interrupts +@opindex msave-mduc-in-interrupts +@opindex mno-save-mduc-in-interrupts +Specifies that interrupt handler functions should preserve the +MDUC registers. This is only necessary if normal code might use +the MDUC registers, for example because it performs multiplication +and division operations. The default is to ignore the MDUC registers +as this makes the interrupt handlers faster. The target option -mg13 +needs to be passed for this to work as this feature is only available +on the G13 target (S2 core). The MDUC registers will only be saved +if the interrupt handler performs a multiplication or division +operation or it calls another function. + @end table @node RS/6000 and PowerPC Options |