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Diffstat (limited to 'utils/qa/branch')
| -rw-r--r-- | utils/qa/branch | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/utils/qa/branch b/utils/qa/branch new file mode 100644 index 00000000..8092a2c5 --- /dev/null +++ b/utils/qa/branch @@ -0,0 +1,37 @@ +BO operand encodings + +0+y 0000y decrement CTR, then branch if CTR != 0 && condition is false +2+y 0001y decrement CTR, then branch if CTR == 0 && condition is false +4+y 0010y branch if condition is false +8+y 0100y decrement CTR, then branch if CTR != 0 && condition is true +10+y 0101y decrement CTR, then branch if CTR == 0 && condition is true +12+y 0110y branch if condition is true +16+y 1000y decrement CTR, then branch if CTR != 0 +18+y 1001y decrement CTR, then branch if CTR == 0 +20 10100 branch always + +y=0: + BCx with negative displacement: branch probably taken + all other cases: branch not taken + +y=1: + reverse prediction + +predict to be taken if + ((BO[0] & BO[2]) | sign(displacement)) xor y + +CR field bit: + +lt 0 +gt 1 +eq 2 +so 3 +un 3 (after fp comparison) + +CR fields: + +cr0 0 +cr1 4 +cr2 8 +... +cr7 28 |