Multiplying Two Registers

Integer Arithmetic

arithmeticmultiply

Multiply low

PowerPC multiplies two registers with one instruction, mullw rD, rA, rB ("multiply low word"). It keeps the low 32 bits of the product and throws away the rest:

mullw r3, r3, r4
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There's no immediate version of mullw. Multiply by a variable and you get mullw; multiply by a constant and you get mulli, which you saw in the warm-up. (One special kind of constant — a power of two — skips even mulli. That's the next lesson.)

Your task

Write func_8037dd24 so it compiles to the mullw above.

Hints

match func_8037dd24mwcceppc.exe -O4,p

Loading editor…

Hit “Compile & Check” to diff your code against the target.