R devel - Nov 2020 - Different results from 'lm' for different 32-bit Windows versions

Hello,

I recently stumbled upon the fact that different 32-bit R Windows versions
produce slightly different results when calling 'lm'. More precisely,
this seems to be caused by a change in the transition from R 3.2.x to R 3.3.0.

A minimal example, for reproducing this is "lm(y~x, data.frame(x=c(1,2,3),
y=c(1,2,3)))".

In R 3.3.0 the result is
Call:
lm(formula = y ~ x, data = data.frame(x = c(1, 2, 3), y = c(1,
    2, 3)))

Coefficients:
(Intercept)            x

0                     1

In R 3.2.4 Revised on gets the result
Call:
lm(formula = y ~ x, data = data.frame(x = c(1, 2, 3), y = c(1,
    2, 3)))

Coefficients:
(Intercept)            x
-4.441e-16    1.000e+00

Both versions behave identically until the call C_Cdqrls in the fit.lm function.
What causes this changed behavior?

Best regards,

Andreas Fromkorth.
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