diff options
Diffstat (limited to 'gcc/doc/tm.texi.in')
| -rw-r--r-- | gcc/doc/tm.texi.in | 24 |
1 files changed, 1 insertions, 23 deletions
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in index acf47e0..1919176 100644 --- a/gcc/doc/tm.texi.in +++ b/gcc/doc/tm.texi.in @@ -2324,29 +2324,7 @@ Do not define this macro if you do not define @code{SECONDARY_MEMORY_NEEDED}. @end defmac -@defmac SECONDARY_MEMORY_NEEDED_MODE (@var{mode}) -When the compiler needs a secondary memory location to copy between two -registers of mode @var{mode}, it normally allocates sufficient memory to -hold a quantity of @code{BITS_PER_WORD} bits and performs the store and -load operations in a mode that many bits wide and whose class is the -same as that of @var{mode}. - -This is right thing to do on most machines because it ensures that all -bits of the register are copied and prevents accesses to the registers -in a narrower mode, which some machines prohibit for floating-point -registers. - -However, this default behavior is not correct on some machines, such as -the DEC Alpha, that store short integers in floating-point registers -differently than in integer registers. On those machines, the default -widening will not work correctly and you must define this macro to -suppress that widening in some cases. See the file @file{alpha.h} for -details. - -Do not define this macro if you do not define -@code{SECONDARY_MEMORY_NEEDED} or if widening @var{mode} to a mode that -is @code{BITS_PER_WORD} bits wide is correct for your machine. -@end defmac +@hook TARGET_SECONDARY_MEMORY_NEEDED_MODE @hook TARGET_CLASS_LIKELY_SPILLED_P |