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Nobody's code will be compiled to use x87 any more.

There is plenty of demand for so called "secure code", where such coder arrogance will not be tolerated. Trust me on that, I know it.

modern compilers do just have options to disable using x87 registers entirely.

What is "coder arrogance"? The expectation that the 20-year-old API (SSE) will be used over the deprecated 40-year-old API that is currently losing compiler (and silicon) support? Can you point to a running x86 machine today that does not have SSE?

It is also faster and more precise to use double-double for math over x87 extended precision. There is literally no reason to compile an x87 instruction today aside from a programmer not knowing better.

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