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Save 2 bytes each in push and pop stack #2

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Save 2 bytes each in push and pop stack #2

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5ce0eec
Save 2 bytes each in push and pop stack
joshgoebel Sep 14, 2018
f2bd7a8
Use ADD instead of SUB
joshgoebel Sep 17, 2018
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6 changes: 2 additions & 4 deletions c8c.c
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Original file line number Diff line number Diff line change
Expand Up @@ -542,15 +542,13 @@ static void gfpush()
{
print("\tLD F,VE");
print("\tLD [I],VE");
print("\tLD VF,0x03");
print("\tADD VE,VF");
print("\tADD VE,0x03");
}

// Generate frame pop.
static void gfpop()
{
print("\tLD VF,0x03");
print("\tSUB VE,VF");
print("\tADD VE,0xFD ; SUB VE, 0x03");
print("\tLD VF,V%1X", v);
print("\tLD F,VE");
print("\tLD VE,[I]");
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