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changeset 1723:b757ebc59851

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Implemented shift instructions in new Z80 core
author Michael Pavone <pavone@retrodev.com>
date Thu, 31 Jan 2019 23:33:36 -0800
parents ac809d044cab
children 9a74c2d05672
files cpu_dsl.py z80.cpu
diffstat 2 files changed, 185 insertions(+), 9 deletions(-) [+]
line wrap: on
line diff
--- a/cpu_dsl.py	Thu Jan 31 23:03:51 2019 -0800
+++ b/cpu_dsl.py	Thu Jan 31 23:33:36 2019 -0800
@@ -242,7 +242,7 @@
 			decl = ''
 			if needsCarry or needsOflow or needsHalf:
 				size = prog.paramSize(rawParams[2])
-				if needsCarry:
+				if needsCarry and op != 'lsr':
 					size *= 2
 				decl,name = prog.getTemp(size)
 				dst = prog.carryFlowDst = name
@@ -325,9 +325,13 @@
 			if calc == 'sign':
 				resultBit = prog.paramSize(prog.lastDst) - 1
 			elif calc == 'carry':
-				resultBit = prog.paramSize(prog.lastDst)
-				if prog.lastOp.op == 'ror':
-					resultBit -= 1
+				if prog.lastOp.op in ('asr', 'lsr'):
+					resultBit = 0
+					myRes = prog.lastA
+				else:
+					resultBit = prog.paramSize(prog.lastDst)
+					if prog.lastOp.op == 'ror':
+						resultBit -= 1
 			elif calc == 'half':
 				resultBit = prog.paramSize(prog.lastDst) - 4
 				myRes = '({a} ^ {b} ^ {res})'.format(a = prog.lastA, b = prog.lastB, res = lastDst)
@@ -453,10 +457,24 @@
 	prog.lastDst = rawParams[1]
 	return '\n\t{var} = {b} - {a};'.format(var = tmpvar, a = params[0], b = params[1])
 
-def _asrCImpl(prog, params, rawParams):
-	shiftSize = prog.paramSize(rawParams[0])
-	mask = 1 << (shiftSize - 1)
-	return '\n\t{dst} = ({a} >> {b}) | ({a} & {mask});'.format(a = params[0], b = params[1], dst = params[2], mask = mask)
+def _asrCImpl(prog, params, rawParams, flagUpdates):
+	needsCarry = False
+	if flagUpdates:
+		for flag in flagUpdates:
+			calc = prog.flags.flagCalc[flag]
+			if calc == 'carry':
+				needsCarry = True
+	decl = ''
+	size = prog.paramSize(rawParams[2])
+	if needsCarry:
+		decl,name = prog.getTemp(size * 2)
+		dst = prog.carryFlowDst = name
+		prog.lastA = params[0]
+	else:
+		dst = params[2]
+	mask = 1 << (size - 1)
+	return decl + '\n\t{dst} = ({a} >> {b}) | ({a} & {mask} ? 0xFFFFFFFFU << ({size} - {b}) : 0);'.format(
+		a = params[0], b = params[1], dst = dst, mask = mask, size=size)
 	
 def _sext(size, src):
 	if size == 16:
--- a/z80.cpu	Thu Jan 31 23:03:51 2019 -0800
+++ b/z80.cpu	Thu Jan 31 23:33:36 2019 -0800
@@ -1504,4 +1504,162 @@
 	z80_rr_index tmp
 	
 fdcb 00011RRR rr_iyd_reg
-	z80_rr_index main.R
\ No newline at end of file
+	z80_rr_index main.R
+	
+cb 00100RRR sla
+	lsl main.R 1 main.R
+	update_flags SZYH0PXN0C
+	
+cb 00100110 sla_hl
+	local tmp 8
+	z80_fetch_hl
+	mov scratch1 tmp
+	lsl tmp 1 tmp
+	update_flags SZYH0PXN0C
+	mov tmp scratch1
+	z80_store_hl
+	
+z80_sla_index
+	arg tmp 8
+	mov wz scratch1
+	ocall read_8
+	cycles 1
+	mov scratch1 tmp
+	lsl tmp 1 tmp
+	update_flags SZYH0PXN0C
+	mov tmp scratch1
+	z80_store_index
+	
+ddcb 00100110 sla_ixd
+	local tmp 8
+	z80_sla_index tmp
+	
+ddcb 00100RRR sla_ixd_reg
+	z80_sla_index main.R
+	
+fdcb 00100110 sla_iyd
+	local tmp 8
+	z80_sla_index tmp
+	
+fdcb 00100RRR sla_iyd_reg
+	z80_sla_index main.R
+	
+cb 00101RRR sra
+	asr main.R 1 main.R
+	update_flags SZYH0PXN0C
+	
+cb 00101110 sra_hl
+	local tmp 8
+	z80_fetch_hl
+	mov scratch1 tmp
+	asr tmp 1 tmp
+	update_flags SZYH0PXN0C
+	mov tmp scratch1
+	z80_store_hl
+	
+z80_sra_index
+	arg tmp 8
+	mov wz scratch1
+	ocall read_8
+	cycles 1
+	mov scratch1 tmp
+	asr tmp 1 tmp
+	update_flags SZYH0PXN0C
+	mov tmp scratch1
+	z80_store_index
+	
+ddcb 00101110 sra_ixd
+	local tmp 8
+	z80_sra_index tmp
+	
+ddcb 00101RRR sra_ixd_reg
+	z80_sra_index main.R
+	
+fdcb 00101110 sra_iyd
+	local tmp 8
+	z80_sra_index tmp
+	
+fdcb 00101RRR sra_iyd_reg
+	z80_sra_index main.R
+	
+cb 00110RRR sll
+	lsl main.R 1 main.R
+	update_flags SZ0YH0XN0C
+	or 1 main.R main.R
+	update_flags P
+	
+cb 00110110 sll_hl
+	local tmp 8
+	z80_fetch_hl
+	mov scratch1 tmp
+	lsl tmp 1 tmp
+	update_flags SZ0YH0XN0C
+	or 1 tmp tmp
+	update_flags P
+	mov tmp scratch1
+	z80_store_hl
+	
+z80_sll_index
+	arg tmp 8
+	mov wz scratch1
+	ocall read_8
+	cycles 1
+	mov scratch1 tmp
+	lsl tmp 1 tmp
+	update_flags SZ0YH0XN0C
+	or 1 tmp tmp
+	update_flags P
+	mov tmp scratch1
+	z80_store_index
+	
+ddcb 00110110 sll_ixd
+	local tmp 8
+	z80_sll_index tmp
+	
+ddcb 00110RRR sll_ixd_reg
+	z80_sll_index main.R
+	
+fdcb 00110110 sll_iyd
+	local tmp 8
+	z80_sll_index tmp
+	
+fdcb 00110RRR sll_iyd_reg
+	z80_sll_index main.R
+	
+cb 00111RRR srl
+	lsr main.R 1 main.R
+	update_flags SZYH0PXN0C
+	
+cb 00111110 srl_hl
+	local tmp 8
+	z80_fetch_hl
+	mov scratch1 tmp
+	lsr tmp 1 tmp
+	update_flags SZYH0PXN0C
+	mov tmp scratch1
+	z80_store_hl
+	
+z80_srl_index
+	arg tmp 8
+	mov wz scratch1
+	ocall read_8
+	cycles 1
+	mov scratch1 tmp
+	lsr tmp 1 tmp
+	update_flags SZYH0PXN0C
+	mov tmp scratch1
+	z80_store_index
+	
+ddcb 00111110 srl_ixd
+	local tmp 8
+	z80_srl_index tmp
+	
+ddcb 00111RRR srl_ixd_reg
+	z80_srl_index main.R
+	
+fdcb 00111110 srl_iyd
+	local tmp 8
+	z80_srl_index tmp
+	
+fdcb 00111RRR srl_iyd_reg
+	z80_srl_index main.R
\ No newline at end of file