GE-120/130 ALU logical and string-move primitives. More...

#include "alu_logic.h"

Functions
void	alu_mvc (struct ge *ge, uint16_t dst, uint16_t src, uint16_t len)
	alu_mvc – Move Characters (MVC, §5.5.3.1)

void	alu_mvi (struct ge *ge, uint16_t addr, uint8_t imm)
	alu_mvi – Move Immediate (MVI, §5.5.5.2)

void	alu_nc (struct ge *ge, uint16_t a, uint16_t b, uint8_t len)
	alu_nc – AND Characters (NC, §5.5.3.9)

void	alu_oc (struct ge *ge, uint16_t a, uint16_t b, uint8_t len)
	alu_oc – OR Characters (OC, §5.5.3.8)

void	alu_xc (struct ge *ge, uint16_t a, uint16_t b, uint8_t len)
	alu_xc – Exclusive-OR Characters (XC, §5.5.3.7)

void	alu_ni (struct ge *ge, uint16_t addr, uint8_t imm)
	alu_ni – AND Immediate (NI, §5.6.3.2)

void	alu_oi (struct ge *ge, uint16_t addr, uint8_t imm)

void	alu_xi (struct ge *ge, uint16_t addr, uint8_t imm)
	alu_xi – Exclusive-OR Immediate (XI, §5.6.3.3)

void	alu_cmc (struct ge *ge, uint16_t a, uint16_t b, uint8_t len)
	alu_cmc – Compare Characters (CMC, §5.5.3.2)

void	alu_ci (struct ge *ge, uint16_t addr, uint8_t imm)
	alu_ci – Compare Immediate (CMI, §5.5.5.1)

void	alu_tl (struct ge *ge, uint16_t a, uint8_t len, uint16_t table)
	alu_tl – Translate (TL, §5.5.3.3, "TR" in manual)

void	alu_tm (struct ge *ge, uint16_t addr, uint8_t mask)
	alu_tm – Test under Mask (TM, §5.6.3.4)

Detailed Description

GE-120/130 ALU logical and string-move primitives.

See alu_logic.h for the full API documentation and condition-code conventions. All semantics are derived from the GE-130 Programmed Description Specification (cpu_6.txt), chapter 5.

CC encoding reminder (from alu_cc.h / alu_cc.c): alu_set_cc(ge, cc) stores the 2-bit value as: bit1 (FA04) = cc >> 1 bit0 (FA05) = cc & 1

For compare operations the GE-120 uses: cc=1 first < second (FA04=0, FA05=1) cc=2 equal (FA04=1, FA05=0) cc=3 first > second (FA04=1, FA05=1) cc=0 "not possible" (never written by these helpers)

For XC/XI/TM: cc=2 result all-zero cc=3 result non-zero

Definition in file alu_logic.c.

Function Documentation

◆ alu_ci()

void alu_ci	(	struct ge *	ge,
		uint16_t	addr,
		uint8_t	imm
	)

alu_ci – Compare Immediate (CMI, §5.5.5.1)

Compares the byte mem[@addr] (unsigned) with the immediate @imm (unsigned). Sets CC: cc = 1 mem[@addr] < @imm cc = 2 mem[@addr] == @imm cc = 3 mem[@addr] > @imm

Definition at line 180 of file alu_logic.c.

◆ alu_cmc()

void alu_cmc	(	struct ge *	ge,
		uint16_t	a,
		uint16_t	b,
		uint8_t	len
	)

alu_cmc – Compare Characters (CMC, §5.5.3.2)

Compares the @len-byte field at with the @len-byte field at , byte by byte, left to right, treating each byte as an unsigned integer. Stops as soon as a difference is found. Neither field is modified. Sets CC: cc = 1 mem[a..] < mem[b..] cc = 2 fields are equal cc = 3 mem[a..] > mem[b..]

Definition at line 153 of file alu_logic.c.

◆ alu_mvc()

void alu_mvc	(	struct ge *	ge,
		uint16_t	dst,
		uint16_t	src,
		uint16_t	len
	)

alu_mvc – Move Characters (MVC, §5.5.3.1)

Copies @len bytes from mem[src .. src+len-1] to mem[dst .. dst+len-1], byte by byte, left to right. Overlapping fields are supported because the copy proceeds strictly left-to-right (same as the manual description). Does not alter the condition code.

Definition at line 31 of file alu_logic.c.

◆ alu_mvi()

void alu_mvi	(	struct ge *	ge,
		uint16_t	addr,
		uint8_t	imm
	)

alu_mvi – Move Immediate (MVI, §5.5.5.2)

Stores the immediate byte @imm into mem[@addr]. Does not alter the condition code.

Definition at line 51 of file alu_logic.c.

◆ alu_nc()

void alu_nc	(	struct ge *	ge,
		uint16_t	a,
		uint16_t	b,
		uint8_t	len
	)

alu_nc – AND Characters (NC, §5.5.3.9)

Performs a bitwise AND of the @len-byte field at with the @len-byte field at ; result written back into . Operates left-to-right. "Qualitative result: it is not interested." — CC is not altered.

Definition at line 61 of file alu_logic.c.

◆ alu_ni()

void alu_ni	(	struct ge *	ge,
		uint16_t	addr,
		uint8_t	imm
	)

alu_ni – AND Immediate (NI, §5.6.3.2)

mem[@addr] &= @imm. "Qualitative result: it is not interested." — CC is not altered.

Definition at line 108 of file alu_logic.c.

◆ alu_oc()

void alu_oc	(	struct ge *	ge,
		uint16_t	a,
		uint16_t	b,
		uint8_t	len
	)

alu_oc – OR Characters (OC, §5.5.3.8)

Bitwise OR of @len bytes at with @len bytes at ; result into . "Qualitative result: it is not interested." — CC is not altered.

Definition at line 73 of file alu_logic.c.

◆ alu_oi()

void alu_oi	(	struct ge *	ge,
		uint16_t	addr,
		uint8_t	imm
	)

Definition at line 118 of file alu_logic.c.

◆ alu_tl()

void alu_tl	(	struct ge *	ge,
		uint16_t	a,
		uint8_t	len,
		uint16_t	table
	)

alu_tl – Translate (TL, §5.5.3.3, "TR" in manual)

For each of the @len bytes b at mem[.. +len-1], replaces it with mem[@table + b]. The @table base address must be a multiple of 256 (per manual). Operates left to right. The table is not altered. "Qualitative result: it is not interested." — CC is not altered.

Definition at line 203 of file alu_logic.c.

◆ alu_tm()

void alu_tm	(	struct ge *	ge,
		uint16_t	addr,
		uint8_t	mask
	)

alu_tm – Test under Mask (TM, §5.6.3.4)

Performs bitwise AND of mem[@addr] and @mask but does NOT write the result to memory. Sets CC: cc = 2 result is 0x00 (all selected bits are zero) cc = 3 result is non-zero (at least one selected bit is set)

Definition at line 226 of file alu_logic.c.

◆ alu_xc()

void alu_xc	(	struct ge *	ge,
		uint16_t	a,
		uint16_t	b,
		uint8_t	len
	)

alu_xc – Exclusive-OR Characters (XC, §5.5.3.7)

Bitwise XOR of @len bytes at with @len bytes at ; result into . Sets CC: cc = 2 if all bytes of the result are 0x00 cc = 3 if any byte of the result is non-zero

Definition at line 85 of file alu_logic.c.

◆ alu_xi()

void alu_xi	(	struct ge *	ge,
		uint16_t	addr,
		uint8_t	imm
	)

alu_xi – Exclusive-OR Immediate (XI, §5.6.3.3)

mem[@addr] ^= @imm. Sets CC: cc = 2 if result is 0x00 cc = 3 if result is non-zero

Definition at line 136 of file alu_logic.c.

Functions