diff options
Diffstat (limited to 'gcc/machmode.def')
| -rw-r--r-- | gcc/machmode.def | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/gcc/machmode.def b/gcc/machmode.def index 72b1ec83644..0b762497d00 100644 --- a/gcc/machmode.def +++ b/gcc/machmode.def @@ -51,7 +51,13 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA constant. A FORMAT argument must be one of the real_mode_format structures - declared in real.h, or else a literal 0. + declared in real.h, or else a literal 0. Do not put a leading & + on the argument. + + An EXPR argument must be a syntactically valid C expression. + If an EXPR contains commas, you may need to write an extra pair of + parentheses around it, so it appears to be a single argument to the + statement. This file defines only those modes which are of use on almost all machines. Other modes can be defined in the target-specific @@ -120,6 +126,17 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA error if there is no 'F'. For INT modes, the names are derived by prefixing a C to the name. + ADJUST_BYTESIZE (MODE, EXPR); + ADJUST_ALIGNMENT (MODE, EXPR); + ADJUST_FLOAT_FORMAT (MODE, EXPR); + Arrange for the byte size, alignment, or floating point format + of MODE to be adjustable at run time. EXPR will be executed + once after processing all command line options, and should + evaluate to the desired byte size, alignment, or format. + + Unlike a FORMAT argument, if you are adjusting a float format + you must put an & in front of the name of each format structure. + Note: If a mode is ever made which is more than 255 bytes wide, machmode.h and genmodes.c will have to be changed to allocate more space for the mode_size and mode_alignment arrays. */ |