Invalid Forms From Invalid Bo Field Encodings - IBM PowerPC 604 User Manual

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• stwbrx
• lswi
• lswx
• stswi
• stswx
• lwarx
• tw
• mtspr
• mfspr
• lfsx
• lfsux
• lfdx
• lfdux
• stfsx
• stfsux
• stfdx
• stfdux
B.4 Invalid Forms from Invalid BO Field Encodings
The following list illustrates the invalid BO fields for the conditional branch instructions
(be, bca, bcl, bcla, heir, bclrl, bcctr, and bcctrl). Specifying a conditional branch
instruction with one of these fields results in a invalid instruction form. Note that entries
with the y bit represent two possible instruction encodings.
Invalid BO field encodings are as follows:
• ()Olly
• 01 lly
• llOOy
• llOly
• 10101
• 10110
• 10111
• 11100
• 11101
• 11110
• 11111
The 604 treats the bits listed above as causing an invalid form as "don't cares."
B-6
PowerPC 604 RISC Microprocessor User's Manual