I have a pair of 32-bit floats stored in eax and ecx. Can I directly load these into the FPU to operate on them, without first storing to memory? This would simplify some compiler code significantly, but fld
seems to only be able to operate on memory.
Add 32-bit floats in eax/ecx registers?
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No, you can't do that. As far as generating code goes, you can simulate
fld r32
easily enough through the following sequence for example (optimized for size ;)) :Consider using SSE if available, which does offer direct GPR-to-XMM moves using the
movd
instruction. Adding the two registers could then look something like:If you need the result in a GPR, you can move it back using another
movd
.