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* sim-main.h (MIPS_MACH_HAS_MT_HILO_HAZARD)

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(MIPS_MACH_HAS_MULT_HILO_HAZARD, MIPS_MACH_HAS_DIV_HILO_HAZARD): New.
	* mips.igen (check_mt_hilo, check_mult_hilo, check_div_hilo): Provide
	separate implementations for mipsIV and mipsV.  Use new macros to
	determine whether the restrictions apply.
This commit is contained in:
Richard Sandiford
2004-03-29 21:56:02 +00:00
parent 9b0de91afe
commit 0e1b7197a4
3 changed files with 72 additions and 13 deletions
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9
sim/mips/ChangeLog
View File

@@ -1,3 +1,12 @@
2004-04-29 Chris Demetriou <cgd@broadcom.com>
Richard Sandiford <rsandifo@redhat.com>
* sim-main.h (MIPS_MACH_HAS_MT_HILO_HAZARD)
(MIPS_MACH_HAS_MULT_HILO_HAZARD, MIPS_MACH_HAS_DIV_HILO_HAZARD): New.
* mips.igen (check_mt_hilo, check_mult_hilo, check_div_hilo): Provide
separate implementations for mipsIV and mipsV. Use new macros to
determine whether the restrictions apply.
2004-01-19 Chris Demetriou <cgd@broadcom.com>
* mips.igen (check_mf_cycles, check_mt_hilo, check_mf_hilo)

64
sim/mips/mips.igen
View File

@@ -238,13 +238,15 @@
// On the r3900, restriction (2) is not present, and restriction (3) is not
// present for multiplication.
//
// For now this code is paranoid. Historically the simulator
// enforced restrictions (2) and (3) for more ISAs and CPU types than
// necessary. Unfortunately, at least some MIPS IV and later parts'
// documentation describes them as having these hazards (e.g. vr5000),
// so they can't be removed for at leats MIPS IV. MIPS V hasn't been
// checked (since there are no known hardware implementations).
//
// Unfortunately, there seems to be some confusion about whether the last
// two restrictions should apply to "MIPS IV" as well. One edition of
// the MIPS IV ISA says they do, but references in later ISA documents
// suggest they don't.
//
// In reality, some MIPS IV parts, such as the VR5000 and VR5400, do have
// these restrictions, while others, like the VR5500, don't. To accomodate
// such differences, the MIPS IV and MIPS V version of these helper functions
// use auxillary routines to determine whether the restriction applies.
// check_mf_cycles:
//
@@ -274,8 +276,6 @@
*mipsI:
*mipsII:
*mipsIII:
*mipsIV:
*mipsV:
*vr4100:
*vr5000:
{
@@ -286,6 +286,18 @@
return ok;
}
:function:::int:check_mt_hilo:hilo_history *history
*mipsIV:
*mipsV:
{
signed64 time = sim_events_time (SD);
int ok = (! MIPS_MACH_HAS_MT_HILO_HAZARD (SD)
|| check_mf_cycles (SD_, history, time, "MT"));
history->mt.timestamp = time;
history->mt.cia = CIA;
return ok;
}
:function:::int:check_mt_hilo:hilo_history *history
*mips32:
*mips64:
@@ -350,8 +362,6 @@
*mipsI:
*mipsII:
*mipsIII:
*mipsIV:
*mipsV:
*vr4100:
*vr5000:
{
@@ -365,6 +375,21 @@
return ok;
}
:function:::int:check_mult_hilo:hilo_history *hi, hilo_history *lo
*mipsIV:
*mipsV:
{
signed64 time = sim_events_time (SD);
int ok = (! MIPS_MACH_HAS_MULT_HILO_HAZARD (SD)
|| (check_mf_cycles (SD_, hi, time, "OP")
&& check_mf_cycles (SD_, lo, time, "OP")));
hi->op.timestamp = time;
lo->op.timestamp = time;
hi->op.cia = CIA;
lo->op.cia = CIA;
return ok;
}
:function:::int:check_mult_hilo:hilo_history *hi, hilo_history *lo
*mips32:
*mips64:
@@ -389,8 +414,6 @@
*mipsI:
*mipsII:
*mipsIII:
*mipsIV:
*mipsV:
*vr4100:
*vr5000:
*r3900:
@@ -405,6 +428,21 @@
return ok;
}
:function:::int:check_div_hilo:hilo_history *hi, hilo_history *lo
*mipsIV:
*mipsV:
{
signed64 time = sim_events_time (SD);
int ok = (! MIPS_MACH_HAS_DIV_HILO_HAZARD (SD)
|| (check_mf_cycles (SD_, hi, time, "OP")
&& check_mf_cycles (SD_, lo, time, "OP")));
hi->op.timestamp = time;
lo->op.timestamp = time;
hi->op.cia = CIA;
lo->op.cia = CIA;
return ok;
}
:function:::int:check_div_hilo:hilo_history *hi, hilo_history *lo
*mips32:
*mips64:

12
sim/mips/sim-main.h
View File

@@ -953,6 +953,18 @@ extern int mips_mach_multi(SIM_DESC sd);
#define MIPS_MACH(SD) MIPS_MACH_DEFAULT
#endif
/* Macros for determining whether a MIPS IV or MIPS V part is subject
to the hi/lo restrictions described in mips.igen. */
#define MIPS_MACH_HAS_MT_HILO_HAZARD(SD) \
(MIPS_MACH (SD) != bfd_mach_mips5500)
#define MIPS_MACH_HAS_MULT_HILO_HAZARD(SD) \
(MIPS_MACH (SD) != bfd_mach_mips5500)
#define MIPS_MACH_HAS_DIV_HILO_HAZARD(SD) \
(MIPS_MACH (SD) != bfd_mach_mips5500)
#if H_REVEALS_MODULE_P (SIM_MAIN_INLINE)
#include "sim-main.c"
#endif