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| author | Julian Brown <julian@codesourcery.com> | 2006-05-03 16:13:43 +0000 |
|---|---|---|
| committer | Julian Brown <julian@codesourcery.com> | 2006-05-03 16:13:43 +0000 |
| commit | f7ac39f019521b5e7d4a64f498d02bdb48963ab8 (patch) | |
| tree | d35f6cac91426cd54c5da84cfd8e0459940101dd | |
| parent | a5cbdaf42d0706e68e54ada32736d3895a0f6883 (diff) | |
| download | binutils-redhat-binutils-csl-sourcerygxx-4_1-4.tar.gz | |
* gas/doc/c-arm.texi: Add documentation for .dn/.qn directives.binutils-csl-sourcerygxx-4_1-4
| -rw-r--r-- | ChangeLog.csl | 4 | ||||
| -rw-r--r-- | gas/doc/c-arm.texi | 31 |
2 files changed, 34 insertions, 1 deletions
diff --git a/ChangeLog.csl b/ChangeLog.csl index dc69626d4b..1e318c4fd2 100644 --- a/ChangeLog.csl +++ b/ChangeLog.csl @@ -1,3 +1,7 @@ +2006-05-03 Julian Brown <julian@codesourcery.com> + + * gas/doc/c-arm.texi: Add documentation for .dn/.qn directives. + 2006-05-03 Paul Brook <paul@codesourcery.com> * bfd/elf32-arm.c (elf32_arm_reloc_map): Add MOVW and MOVT relocs. diff --git a/gas/doc/c-arm.texi b/gas/doc/c-arm.texi index 0b113f9894..941b1ee4c6 100644 --- a/gas/doc/c-arm.texi +++ b/gas/doc/c-arm.texi @@ -391,7 +391,7 @@ example: @cindex @code{unreq} directive, ARM @item .unreq @var{alias-name} This undefines a register alias which was previously defined using the -@code{req} directive. For example: +@code{req}, @code{dn} or @code{qn} directives. For example: @smallexample foo .req r0 @@ -402,6 +402,35 @@ An error occurs if the name is undefined. Note - this pseudo op can be used to delete builtin in register name aliases (eg 'r0'). This should only be done if it is really necessary. +@cindex @code{dn} and @code{qn} directives, ARM +@item @var{name} .dn @var{register name} [@var{.type}] [@var{[index]}] +@item @var{name} .qn @var{register name} [@var{.type}] [@var{[index]}] + +The @code{dn} and @code{qn} are used to create typed and/or indexed +register aliases for use in Advanced SIMD Extension (Neon) instructions. +The former should be used to create aliases of double-precision registers, +and the latter to create aliases of quad-precision registers. + +If these directives are used to create typed aliases, those aliases can +be used in Neon instructions instead of writing types after the mnemonic +or after each operand. For example: + +@smallexample + x .dn d2.f32 + y .dn d3.f32 + z .dn d4.f32[1] + vmul x,y,z +@end smallexample + +This is equivalent to writing the following: + +@smallexample + vmul.f32 d2,d3,d4[1] +@end smallexample + +Aliases created using @code{dn} or @code{qn} can be destroyed using +@code{unreq}. + @cindex @code{code} directive, ARM @item .code @code{[16|32]} This directive selects the instruction set being generated. The value 16 |