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Passing the pizza gauntlet

This commit is contained in:
Guy Perfect 2024-10-13 20:13:20 -05:00
parent 2e1cd12829
commit 1d6f62e319
1 changed files with 9 additions and 7 deletions
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16
core/cpu.c
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@ -703,7 +703,7 @@ static int cpuBSArithmetic(VB *sim) {
case 2:
/* Read the high source word */
if (cpuRead(sim, bsSrcAddr + 1, VB_S32, (int32_t *) &src)) {
if (cpuRead(sim, bsSrcAddr + 4, VB_S32, (int32_t *) &src)) {
sim->cpu.step = 2;
return 1;
}
@ -713,13 +713,14 @@ static int cpuBSArithmetic(VB *sim) {
case 3:
/* Read the destination word */
if (cpuRead(sim, bsDestAddr, VB_S32, (int32_t *) &dest)) {
if (cpuRead(sim, bsDestAddr, VB_S32, (int32_t *) &auxBS.dest)) {
sim->cpu.step = 3;
return 1;
}
/* Perform the ALU operation */
src = bsSrcBit < bsDestBit ?
dest = auxBS.dest;
src = bsSrcBit < bsDestBit ?
auxBS.src << (bsDestBit - bsSrcBit ) :
auxBS.src >> (bsSrcBit - bsDestBit)
;
@ -755,18 +756,19 @@ static int cpuBSArithmetic(VB *sim) {
src = bsLength;
/* Advance to next output word */
if (bsSrcBit + src >= 32)
bsSrcAddr += 4;
if (bsSrcBit + src >= 32) {
bsSrcAddr += 4;
auxBS.src >>= 32;
sim->cpu.step = 2; /* Read high source word */
} else sim->cpu.step = 3; /* Read destination word */
if (bsDestBit + src >= 32)
bsDestAddr += 4;
bsSrcBit = (bsSrcBit + src) & 31;
bsDestBit = (bsDestBit + src) & 31;
bsLength -= src;
auxBS.src >>= 32;
/* Update state */
sim->cpu.clocks += cpuClocks(12); /* TODO: Research */
sim->cpu.step = 2; /* Read high source word */
}
/* Exit condition */