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[/] [zipcpu/] [trunk/] [rtl/] - Rev 154

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145 This fixes the pipelined memory problem that was introduced a while back to
fix ... pipelined memory conflicts. This appears to maintain the success
of the fix, while recovering the pipeline memory performance that was had
before.
dgisselq 2334d 06h /zipcpu/trunk/rtl/
144 Makes the auto-reload capability a configuration option, and fills out the
reset so that it is properly implemented.
dgisselq 2334d 06h /zipcpu/trunk/rtl/
140 Minor changes, but fixes build of zippy_tb.cpp. dgisselq 2337d 20h /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 2340d 17h /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 2355d 08h /zipcpu/trunk/rtl/
132 Lots of minor bug fixes. dgisselq 2355d 08h /zipcpu/trunk/rtl/
131 Fixed a variable use before declaration error. dgisselq 2355d 08h /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 2355d 08h /zipcpu/trunk/rtl/
129 Bug fix. Fixes some ugly race conditions that would cause code from the wrong
address to be executed.
dgisselq 2355d 08h /zipcpu/trunk/rtl/
128 Cleaned up some comments. dgisselq 2355d 08h /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 2374d 08h /zipcpu/trunk/rtl/
115 A bug fix, applies to when there are more than 9 interrupt lines into the CPU. dgisselq 2374d 16h /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 2398d 17h /zipcpu/trunk/rtl/
91 Minor updates. dgisselq 2439d 10h /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 2439d 10h /zipcpu/trunk/rtl/
88 Eliminated some warnings. The div fixes were to simplify the logic, even though
the result is less readable ...
dgisselq 2463d 10h /zipcpu/trunk/rtl/
84 Minor updates. dgisselq 2465d 08h /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 2465d 08h /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 2465d 08h /zipcpu/trunk/rtl/
81 Trying to clean up ISE generated warnings. dgisselq 2465d 08h /zipcpu/trunk/rtl/

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