Mercurial > repos > blastem
changeset 1750:01236179fc71
Optimization to memory access in new Z80 core
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sat, 09 Feb 2019 11:34:31 -0800 |
| parents | e4fe5a450d05 |
| children | c5d4e1d14dac |
| files | cpu_dsl.py z80.cpu z80_util.c |
| diffstat | 3 files changed, 36 insertions(+), 8 deletions(-) [+] |
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--- a/cpu_dsl.py Fri Feb 08 23:09:58 2019 -0800 +++ b/cpu_dsl.py Sat Feb 09 11:34:31 2019 -0800 @@ -1032,8 +1032,8 @@ def addReg(self, name, size): self.regs[name] = size - def addPointer(self, name, size): - self.pointers[name] = size + def addPointer(self, name, size, count): + self.pointers[name] = (size, count) def addRegArray(self, name, size, regs): self.regArrays[name] = (size, regs) @@ -1070,12 +1070,15 @@ def processLine(self, parts): if len(parts) == 3: - self.addRegArray(parts[0], int(parts[1]), int(parts[2])) + if parts[1].startswith('ptr'): + self.addPointer(parts[0], parts[1][3:], int(parts[2])) + else: + self.addRegArray(parts[0], int(parts[1]), int(parts[2])) elif len(parts) > 2: self.addRegArray(parts[0], int(parts[1]), parts[2:]) else: if parts[1].startswith('ptr'): - self.addPointer(parts[0], parts[1][3:]) + self.addPointer(parts[0], parts[1][3:], 1) else: self.addReg(parts[0], int(parts[1])) return self @@ -1084,13 +1087,17 @@ fieldList = [] for pointer in self.pointers: stars = '*' - ptype = self.pointers[pointer] + ptype, count = self.pointers[pointer] while ptype.startswith('ptr'): stars += '*' ptype = ptype[3:] if ptype.isdigit(): ptype = 'uint{sz}_t'.format(sz=ptype) - hFile.write('\n\t{ptype} {stars}{nm};'.format(nm=pointer, ptype=ptype, stars=stars)) + if count > 1: + arr = '[{n}]'.format(n=count) + else: + arr = '' + hFile.write('\n\t{ptype} {stars}{nm}{arr};'.format(nm=pointer, ptype=ptype, stars=stars, arr=arr)) for reg in self.regs: if not self.isRegArrayMember(reg): fieldList.append((self.regs[reg], 1, reg))
--- a/z80.cpu Fri Feb 08 23:09:58 2019 -0800 +++ b/z80.cpu Sat Feb 09 11:34:31 2019 -0800 @@ -34,6 +34,7 @@ io_map ptrmemmap_chunk io_chunks 32 io_mask 32 + fastmem ptr8 64 flags register f
--- a/z80_util.c Fri Feb 08 23:09:58 2019 -0800 +++ b/z80_util.c Sat Feb 09 11:34:31 2019 -0800 @@ -3,13 +3,23 @@ void z80_read_8(z80_context *context) { context->cycles += 3 * context->opts->gen.clock_divider; - context->scratch1 = read_byte(context->scratch1, NULL, &context->opts->gen, context); + uint8_t *fast = context->fastmem[context->scratch1 >> 10]; + if (fast) { + context->scratch1 = fast[context->scratch1 & 0x3FF]; + } else { + context->scratch1 = read_byte(context->scratch1, NULL, &context->opts->gen, context); + } } void z80_write_8(z80_context *context) { context->cycles += 3 * context->opts->gen.clock_divider; - write_byte(context->scratch2, context->scratch1, NULL, &context->opts->gen, context); + uint8_t *fast = context->fastmem[context->scratch2 >> 10]; + if (fast) { + fast[context->scratch2 & 0x3FF] = context->scratch1; + } else { + write_byte(context->scratch2, context->scratch1, NULL, &context->opts->gen, context); + } } void z80_io_read8(z80_context *context) @@ -69,6 +79,16 @@ context->io_map = (memmap_chunk *)tmp_io_chunks; context->io_chunks = tmp_num_io_chunks; context->io_mask = tmp_io_mask; + for(uint32_t address = 0; address < 0x10000; address+=1024) + { + uint8_t *start = get_native_pointer(address, NULL, &options->gen); + if (start) { + uint8_t *end = get_native_pointer(address + 1023, NULL, &options->gen); + if (end && end - start == 1023) { + context->fastmem[address >> 10] = start; + } + } + } return context; }