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changeset 482:9c24336fa76c
Correct cycle counts for W relative indexing modes
Actually handle the 6309 specific W relative indexing modes (,W; n,W; ,W++;
,--W) in the cycle count calculation code. These work differently than the
regular indexing modes so it's necessary to handle their bit patterns
specially. (The bits that would normally select the base register are used
instead to select the operation on W.)
| author | William Astle <lost@l-w.ca> |
|---|---|
| date | Thu, 24 Jan 2019 18:24:03 -0700 |
| parents | 62720ac9e28d |
| children | 40c32a0af8c8 |
| files | lwasm/cycle.c |
| diffstat | 1 files changed, 22 insertions(+), 0 deletions(-) [+] |
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--- a/lwasm/cycle.c Wed Dec 12 21:18:20 2018 -0700 +++ b/lwasm/cycle.c Thu Jan 24 18:24:03 2019 -0700 @@ -624,6 +624,28 @@ if ((pb & 0x80) == 0) /* 5 bit offset */ return 1; + // These need special handling because the *register* bits determine the specific operation (and, thus, cycle counts) + if (!CURPRAGMA(cl, PRAGMA_6809)) + { + switch (pb) + { + case 0x8f: // ,W + return 0; + case 0xaf: // n,W (16 bit) + return 2; + case 0xcf: // ,W++ + case 0xef: // ,--W + return 1; + case 0x90: // [,W] + return 3; + case 0xb0: // [n,W] (16 bit) + return 5; + case 0xd0: // [,W++] + case 0xf0: // [,--W] + return 4; + } + } + if (pb & 0x10) /* indirect */ return CURPRAGMA(cl, PRAGMA_6809) ? indtab[pb & 0xf].cycles_6809_indirect : indtab[pb & 0xf].cycles_6309_indirect; else