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Diffstat (limited to 'gcc/doc/install.texi')
| -rw-r--r-- | gcc/doc/install.texi | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index dfad815d49a..01cbb47c25b 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -959,6 +959,18 @@ options and for @option{-mhard-float} or @option{-msoft-float}. As with @option{--with-cpu}, which switches will be accepted and acceptable values of the arguments depend on the target. +@item --with-divide=@var{type} +Specify how the compiler should generate code for checking for +division by zero. This option is only supported on the MIPS target. +The possibilities for @var{type} are: +@table @code +@item traps +Division by zero checks use conditional traps (this is the default on +systems that support conditional traps). +@item breaks +Division by zero checks use the break instruction. +@end table + @item --enable-altivec Specify that the target supports AltiVec vector enhancements. This option will adjust the ABI for AltiVec enhancements, as well as generate @@ -3201,6 +3213,16 @@ configure for @samp{mipsel-elf} as a workaround. The @samp{mips*-*-linux*} target continues to use the MIPS II routines. More work on this is expected in future releases. +MIPS systems check for division by zero (unless +@option{-mno-check-zero-division} is passed to the compiler) by +generating either a conditional trap or a break instruction. Using +trap results in smaller code, but is only supported on MIPS II and +later. Also, some versions of the Linux kernel have a bug that +prevents trap from generating the proper signal (SIGFPE). To enable +the use of break, use the @option{--with-divide=breaks} +@command{configure} option when configuring GCC. The default is to +use traps on systems that support them. + Cross-compilers for the Mips as target using the Mips assembler currently do not work, because the auxiliary programs @file{mips-tdump.c} and @file{mips-tfile.c} can't be compiled on |