Rev |
Log message |
Author |
Age |
Path |
144 |
Makes the auto-reload capability a configuration option, and fills out the
reset so that it is properly implemented. |
dgisselq |
2877d 10h |
/zipcpu/trunk/rtl/ |
140 |
Minor changes, but fixes build of zippy_tb.cpp. |
dgisselq |
2881d 00h |
/zipcpu/trunk/rtl/ |
138 |
This updates the CPU multiply instruction into a set of three instructions.
MPY is a 32x32-bit multiply instruction, returning the low 32-bit result,
MPYUHI returns the upper 32-bits assuming the result was unsigned and MPYSHI
returns the upper 32-bits assuming the result was signed. |
dgisselq |
2883d 21h |
/zipcpu/trunk/rtl/ |
133 |
Changes preceding an instruction set update, which will change the multiply
operation from a 16x16 bit multiply to three types of 32x32-bit multiplies. |
dgisselq |
2898d 12h |
/zipcpu/trunk/rtl/ |
132 |
Lots of minor bug fixes. |
dgisselq |
2898d 12h |
/zipcpu/trunk/rtl/ |
131 |
Fixed a variable use before declaration error. |
dgisselq |
2898d 12h |
/zipcpu/trunk/rtl/ |
130 |
Simplified the lock logic, and removed it when pipelining was not defined. This
also means the file is now dependent upon cpudefs.v. In another change, brev
was modified so as not to update the flags. This makes it useable with GCC
as a potential move or load immediate instruction. |
dgisselq |
2898d 12h |
/zipcpu/trunk/rtl/ |
129 |
Bug fix. Fixes some ugly race conditions that would cause code from the wrong
address to be executed. |
dgisselq |
2898d 12h |
/zipcpu/trunk/rtl/ |
128 |
Cleaned up some comments. |
dgisselq |
2898d 12h |
/zipcpu/trunk/rtl/ |
118 |
Fixes two bugs: 1) in the early branching code within the instruction decoder.
This prevented the early branching from working when built with Xilinx's tools,
while the code worked with Verilator. 2) The CPU was not working with the
traditional cache and early branching disabled. These two bugs masked each
other. The replacement code is simpler. |
dgisselq |
2917d 12h |
/zipcpu/trunk/rtl/ |
115 |
A bug fix, applies to when there are more than 9 interrupt lines into the CPU. |
dgisselq |
2917d 20h |
/zipcpu/trunk/rtl/ |
105 |
Fixed some nasty early branching bugs. Adjusted the Makefile to declare that
cpudefs.h was automatically generated from cpudefs.v, and made sure that
zipbones included the cpudefs.v so it could get the DEBUG_SCOPE define.
In addition, the test.S was updated to test long jumps, the early branching
bug we found, and all three early branching instructions: ADD #x,PC, LOC(PC),PC,
and LDI #x,PC. |
dgisselq |
2941d 20h |
/zipcpu/trunk/rtl/ |
91 |
Minor updates. |
dgisselq |
2982d 14h |
/zipcpu/trunk/rtl/ |
90 |
Removed MOV x(PC),PC from the list of possible early branching instructions.
ADD X,PC and LDI X,PC are now the only recognized early branching instructions.
This was done to spare logic, although I don't think I spared more than a
LUT or two. |
dgisselq |
2982d 14h |
/zipcpu/trunk/rtl/ |
88 |
Eliminated some warnings. The div fixes were to simplify the logic, even though
the result is less readable ... |
dgisselq |
3006d 13h |
/zipcpu/trunk/rtl/ |
84 |
Minor updates. |
dgisselq |
3008d 12h |
/zipcpu/trunk/rtl/ |
83 |
Added a flag to indicate whether an exception took place on the first
or second half of a VLIW instruction--will be zero in non-VLIW mode,
equivalent to the second half of the instruction having caused the
exception. (Expect these flags to be reordered some time in the future into
a less haphazard ordering ...)
Vastly simplified the pipeline logic, primarily for op_stall, but also touched
opA and opB. (Trying to fit within timing on Spartan 6 ...)
Changed division instruction to include a reset on clear_pipeline, to make
certain [BC $addr; DIV Rx,Ry ] works regardless of whether the condition is
true. |
dgisselq |
3008d 12h |
/zipcpu/trunk/rtl/ |
82 |
Found and (I hope) fixed a nasty bug that would send the prefetch into an
endless loop whenever you jumped to an instruction at the last location
in an unloaded cache line. |
dgisselq |
3008d 12h |
/zipcpu/trunk/rtl/ |
81 |
Trying to clean up ISE generated warnings. |
dgisselq |
3008d 12h |
/zipcpu/trunk/rtl/ |
80 |
Bug fix: declared the (combined) multiply to be signed again. Also
changed the name of the generate'd for block, to keep ISE from complaining. |
dgisselq |
3008d 12h |
/zipcpu/trunk/rtl/ |