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Just noticed the following also in optabs.c:
/* We can't do it with an insn, so use a library call. But first ensure that the mode of TO is at least as wide as SImode, since those are the only library calls we know about. */
if (GET_MODE_SIZE (GET_MODE (to))< GET_MODE_SIZE (SImode)) { target = gen_reg_rtx (SImode); expand_fix (target, from, unsignedp); }
This comment provides some insight on to why gcc keeps converting to SImode.
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