Doubles Drop the 's'

Floating Point

floating-pointdouble-precisiontypes

`f64` is double precision

Single precision is f32. Double precision is f64, the C double, and the hardware mirrors every float op in a second flavor without that trailing s. So a + b on f64 operands lands on fadd, not fadds:

fadd f1, f1, f2    # f1 = a + b, double precision
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So fadd/fmul/fsub/fdiv handle doubles and fadds/fmuls/fsubs/fdivs handle singles. One letter, and it pins down the operand type. That little difference is gold when you're rebuilding the original C declarations from nothing but disassembly.

Your task

Write add_d to compile to the fadd above.

Hints

match add_dmwcceppc.exe -O4,p

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