abdelrahman/performance-aware-programming
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compare: abdelrahman:96d13813037cbceab7cfafec45a0842471bc11b0
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abdelrahman:main

No commits in common. "904c398911d524da2c81dd2c871492ed89cff9ca" and "96d13813037cbceab7cfafec45a0842471bc11b0" have entirely different histories.
904c398911 ... 96d1381303

7 changed files with 8 additions and 22 deletions
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2
8086_sim/include/reg_access.h
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@ -4,8 +4,6 @@
#include "aliases.h" #include "aliases.h"
#include "sim86_instruction.h" #include "sim86_instruction.h"
#define REGISTER_COUNT 13
void set_register(register_access reg, u16 new_value); void set_register(register_access reg, u16 new_value);
u16 get_register(register_access reg); u16 get_register(register_access reg);
const char *get_register_name(register_access reg); const char *get_register_name(register_access reg);

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8086_sim/listing_0043_immediate_movs Normal file
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8086_sim/listing_0044_register_movs Normal file
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8086_sim/listing_0045_challenge_register_movs Normal file
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@ -0,0 +1 @@
И""ЛDDЙffК<66><D09A><EFBFBD>а<EFBFBD>л<EFBFBD>С

12
8086_sim/reg_access.cpp
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@ -2,9 +2,9 @@
#include "include/aliases.h" #include "include/aliases.h"
#include <stdio.h> #include <stdio.h>
static u16 registers[REGISTER_COUNT] = {0}; #define REGISTER_COUNT 13
#define BIT_PER_BYTE 8 static u16 registers[REGISTER_COUNT] = {0};
void set_register(register_access reg, u16 new_value) { void set_register(register_access reg, u16 new_value) {
if (reg.Count == 2) { if (reg.Count == 2) {
@ -12,7 +12,7 @@ void set_register(register_access reg, u16 new_value) {
return; return;
} }
u16 shift = (u16)(reg.Offset) * BIT_PER_BYTE; u16 shift = (u16)(reg.Offset) * (u16)sizeof(u8);
u16 mask = 0xff00; u16 mask = 0xff00;
registers[reg.Index] &= (mask >> shift); registers[reg.Index] &= (mask >> shift);
@ -24,10 +24,8 @@ u16 get_register(register_access reg) {
return registers[reg.Index]; return registers[reg.Index];
} }
u16 shift = (u16)(reg.Offset) * BIT_PER_BYTE; // TODO (Abdelrahman): Implement this
u16 mask = 0x00ff; return 0;
return (registers[reg.Index] >> shift) & mask;
} }
const char *get_register_name(register_access reg) { const char *get_register_name(register_access reg) {

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8086_sim/sim86
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15
8086_sim/sim86.cpp
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@ -42,8 +42,6 @@ int main(int argc, char *argv[]) {
u32 offset = 0; u32 offset = 0;
bool accessed_registers[REGISTER_COUNT] = {false};
while (offset < size) { while (offset < size) {
instruction decoded; instruction decoded;
Sim86_Decode8086Instruction(size - offset, buffer + offset, &decoded); Sim86_Decode8086Instruction(size - offset, buffer + offset, &decoded);
@ -57,22 +55,13 @@ int main(int argc, char *argv[]) {
if (dest.Type == Operand_Register) { if (dest.Type == Operand_Register) {
mov_to_register(dest.Register, source); mov_to_register(dest.Register, source);
printf("%s: 0x%04x\n", get_register_name(dest.Register),
accessed_registers[dest.Register.Index] = true; get_register(dest.Register));
} }
} }
} }
} }
for (u32 i = 0; i < REGISTER_COUNT; ++i) {
if (accessed_registers[i]) {
register_access reg = {i, 0, 2};
u16 value = get_register(reg);
printf("%s: 0x%04x (%d)\n", get_register_name(reg), value, value);
}
}
return 0; return 0;
} }