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Make getver() into a constant function since Version Register (%ver)

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is read only and its value is constant.

This change reduces multipule %ver reads to one in the functions
which uses a number of CPU_IS_* macros.
This commit is contained in:
nakayama 2014-12-05 11:31:50 +00:00
parent aaf5c384d9
commit 8cf4de8049
1 changed files with 19 additions and 2 deletions
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21
sys/arch/sparc64/include/psl.h
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@ -1,4 +1,4 @@
/* $NetBSD: psl.h,v 1.53 2013/08/18 09:31:38 martin Exp $ */
/* $NetBSD: psl.h,v 1.54 2014/12/05 11:31:50 nakayama Exp $ */
/*
* Copyright (c) 1992, 1993
@ -287,6 +287,13 @@
/*
* Inlines for manipulating privileged and ancillary state registers
*/
#define SPARC64_RDCONST_DEF(rd, name, reg, type) \
static __inline __constfunc type get##name(void) \
{ \
type _val; \
__asm(#rd " %" #reg ",%0" : "=r" (_val)); \
return _val; \
}
#define SPARC64_RD_DEF(rd, name, reg, type) \
static __inline type get##name(void) \
{ \
@ -301,9 +308,19 @@ static __inline void set##name(type _val) \
}
#ifdef __arch64__
#define SPARC64_RDCONST64_DEF(rd, name, reg) \
SPARC64_RDCONST_DEF(rd, name, reg, uint64_t)
#define SPARC64_RD64_DEF(rd, name, reg) SPARC64_RD_DEF(rd, name, reg, uint64_t)
#define SPARC64_WR64_DEF(wr, name, reg) SPARC64_WR_DEF(wr, name, reg, uint64_t)
#else
#define SPARC64_RDCONST64_DEF(rd, name, reg) \
static __inline __constfunc uint64_t get##name(void) \
{ \
uint32_t _hi, _lo; \
__asm(#rd " %" #reg ",%0; srl %0,0,%1; srlx %0,32,%0" \
: "=r" (_hi), "=r" (_lo)); \
return ((uint64_t)_hi << 32) | _lo; \
}
#define SPARC64_RD64_DEF(rd, name, reg) \
static __inline uint64_t get##name(void) \
{ \
@ -345,7 +362,7 @@ SPARC64_RDPR_DEF(cwp, %cwp, int) /* getcwp() */
SPARC64_WRPR_DEF(cwp, %cwp, int) /* setcwp() */
/* Version Register (PR 31) */
SPARC64_RDPR64_DEF(ver, %ver) /* getver() */
SPARC64_RDCONST64_DEF(rdpr, ver, %ver) /* getver() */
/* System Tick Register (ASR 24) */
SPARC64_RDASR64_DEF(stick, STICK) /* getstick() */