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| author | aldyh <aldyh@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-11-04 00:34:50 +0000 |
|---|---|---|
| committer | aldyh <aldyh@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-11-04 00:34:50 +0000 |
| commit | 10027da64703d81dc132b5ee4830d195ccd5901c (patch) | |
| tree | 7ebaf99cf0aa2597bde7047ff09e61f869c3777d /gcc/machmode.def | |
| parent | b77a0a9c98561474df3ba328ba13d4f97365b91c (diff) | |
| download | gcc-10027da64703d81dc132b5ee4830d195ccd5901c.tar.gz | |
2001-11-03 Aldy Hernandez <aldyh@redhat.com>
* machmode.def: Add documentation for the seventh argument in
vector modes.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@46753 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/machmode.def')
| -rw-r--r-- | gcc/machmode.def | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/machmode.def b/gcc/machmode.def index f84c2e7149d..580f6ff61c6 100644 --- a/gcc/machmode.def +++ b/gcc/machmode.def @@ -59,8 +59,11 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA It is same as the fifth argument except for complexes and vectors, since they are really made of many equal size subunits. - Seventh arg is next wider natural mode of the same class. - 0 if there is none. */ + Seventh arg is next wider natural mode of the same class. 0 if + there is none. Vector modes use this field to point to the next + vector size, so we can iterate through the different vectors modes. + The ordering is by increasing byte size, with QI coming before HI, + HI before SI, etc. */ /* VOIDmode is used when no mode needs to be specified, as for example on CONST_INT RTL expressions. */ @@ -109,7 +112,7 @@ DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, BITS_PER_UNIT*64, 64, 32, VOIDmo /* There are no V1xx vector modes. These are equivalent to normal scalar modes. */ /* The wider mode field for vectors follows in order of increasing bit - size with QI coming before HI, HI before SI, and SI before DF + size with QI coming before HI, HI before SI, and SI before DI within same bit sizes. */ DEF_MACHMODE (V2QImode, "V2QI", MODE_VECTOR_INT, BITS_PER_UNIT*2, 2, 1, V4QImode) DEF_MACHMODE (V2HImode, "V2HI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 2, V8QImode) |