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rtl.def (UNSPEC, [...]): More comments. 

2007-07-03  Seongbae Park  <seongbae.park@gmail.com>

	* rtl.def (UNSPEC, USE, CLOBBER): More comments.

From-SVN: r126286
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Seongbae Park 2007-07-03 22:44:26 +00:00 committed by Seongbae Park
parent d9ad786245
commit e3ceb300c5
2 changed files with 23 additions and 4 deletions
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@ -1,3 +1,7 @@
2007-07-03 Seongbae Park <seongbae.park@gmail.com>
* rtl.def (UNSPEC, USE, CLOBBER): More comments.
2007-07-04 Ben Elliston <bje@au.ibm.com>
* c-objc-common.c (c_types_compatible_p): Fix indentation.

23
gcc/rtl.def
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@ -212,8 +212,15 @@ DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEsi", RTX_EXTRA)
operations is to be performed.
(Note that the vector must be the first operand because of the way that
genrecog.c record positions within an insn.)
This can occur all by itself in a PATTERN, as a component of a PARALLEL,
or inside an expression. */
UNSPEC can occur all by itself in a PATTERN, as a component of a PARALLEL,
or inside an expression.
UNSPEC by itself or as a component of a PARALLEL
is currently considered not deletable.
FIXME: Replace all uses of UNSPEC that appears by itself or as a component
of a PARALLEL with USE.
*/
DEF_RTL_EXPR(UNSPEC, "unspec", "Ei", RTX_EXTRA)
/* Similar, but a volatile operation and one which may trap. */
@ -273,12 +280,20 @@ DEF_RTL_EXPR(SET, "set", "ee", RTX_EXTRA)
/* Indicate something is used in a way that we don't want to explain.
For example, subroutine calls will use the register
in which the static chain is passed. */
in which the static chain is passed.
USE can not appear as an operand of other rtx except for PARALLEL.
USE is not deletable, as it indicates that the operand
is used in some unknown way. */
DEF_RTL_EXPR(USE, "use", "e", RTX_EXTRA)
/* Indicate something is clobbered in a way that we don't want to explain.
For example, subroutine calls will clobber some physical registers
(the ones that are by convention not saved). */
(the ones that are by convention not saved).
CLOBBER can not appear as an operand of other rtx except for PARALLEL.
CLOBBER of a hard register appearing by itself (not within PARALLEL)
is considered undeletable before reload. */
DEF_RTL_EXPR(CLOBBER, "clobber", "e", RTX_EXTRA)
/* Call a subroutine.