D'oh. I'm old enough to have written software which needs to care about the i387 FPU and yet here I am acting as though the floating point instructions use the

D'oh. I'm old enough to have written software which needs to care about the i387 FPU and yet here I am acting as though the floating point instructions use the ordinary scalar registers. Worse, I have a window open where I'm writing toy software that doesn't compile because it is asking to do an FPU operation on a GPR and rather than fix that, which would remind me that this can't work, I decided to alt-tab to HN and make the exact same mistake.