From: Jim Blandy <jimb@redhat.com>
To: sid@sources.redhat.com
Subject: doc fix for some CGEN macros
Date: Sat, 07 May 2005 04:40:00 -0000 [thread overview]
Message-ID: <vt2oebnbqji.fsf@zenia.home> (raw)
I've committed this.
2005-05-06 Jim Blandy <jimb@redhat.com>
* cgen-engine.h (EXTRACT_MSB0_INT, EXTRACT_MSB0_UINT)
(EXTRACT_LSB0_INT, EXTRACT_LSB0_UINT): Doc fixes.
Index: sid/component/cgen-cpu/cgen-engine.h
===================================================================
RCS file: /cvs/cvsfiles/devo/sid/component/cgen-cpu/cgen-engine.h,v
retrieving revision 1.22
diff -c -p -r1.22 cgen-engine.h
*** sid/component/cgen-cpu/cgen-engine.h 21 Feb 2005 09:11:37 -0000 1.22
--- sid/component/cgen-cpu/cgen-engine.h 7 May 2005 04:35:17 -0000
*************** public:
*** 579,584 ****
--- 579,588 ----
\f
// Instruction field support macros.
+ /* Treating the TOTAL least significant bits of VAL as a field, and
+ numbering its leftmost bit zero, return the LENGTH-bit subfield
+ whose leftmost bit is START.
+ The '*INT' version sign-extends; the '*UINT' version doesn't. */
#define EXTRACT_MSB0_INT(val, total, start, length) \
(((INT) (val) << ((sizeof (INT) * 8) - (total) + (start))) \
>> ((sizeof (INT) * 8) - (length)))
*************** public:
*** 586,591 ****
--- 590,599 ----
(((UINT) (val) << ((sizeof (UINT) * 8) - (total) + (start))) \
>> ((sizeof (UINT) * 8) - (length)))
+ /* Treating the TOTAL least significant bits of VAL as a field, and
+ numbering its rightmost bit zero, return the LENGTH-bit subfield
+ whose leftmost bit is START.
+ The '*INT' version sign-extends; the '*UINT' version doesn't. */
#define EXTRACT_LSB0_INT(val, total, start, length) \
(((INT) (val) << ((sizeof (INT) * 8) - (start) - 1)) \
>> ((sizeof (INT) * 8) - (length)))
reply other threads:[~2005-05-07 4:40 UTC|newest]
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